On Thu, Aug 04, 2016 at 12:02:23PM +0300, Jani Nikula wrote:
> On Tue, 12 Jul 2016, Daniel Vetter <daniel at ffwll.ch> wrote:
> > On Thu, Jun 30, 2016 at 12:30:56PM +0100, Chris Wilson wrote:
> >> Backlights controlled by i915.ko and only associated with its connectors
> >> and also only associated with the intel_drmfb fbcon, controlled by
> >> i915.ko. In this situation, we already handle adjusting the backlight
> >> when the fbcon is blanked/unblanked and do not require backlight trying
> >> to do the same.
> >>
> >> Attempting to register with the fbdev as a client causes lockdep to warn
> >> about a dependency cycle:
> >
> > The fbdev notifier strikes again!
> >
> > Last time I looked into this I think the proper solution would be to split
> > the backlight part from the other fbdev notifier (which is used by fbcon
> > for reacting to fbdev device reg/unreg events).
> >
> > I think that would fix this too, with the added bonus of slightly
> > untangling the fbcon locking mess. And it's also the one part of
> > untangling this mess which should be possible without any trouble - I've
> > simply never done it since entirely getting rid of the fbdev notifier for
> > fbcon is a lot more work.
>
> So what do we do with this? It fixes a problem upstream. There's no
> Fixes: to identify the bad commit. Any idea on that? It's either this or
> we dig out the bad commit (Chris probably knows which one?) and revert.
The real trouble is the drm_for_each_connector in
drm_connector_register_all(). This introduced the new depency. The proper
fix imo is to fix up the connector_list locking, but for 4.8 we could do
the same hack+comment like we do in unregister_all. It's not the only
place that's broken anyway, and much less invasive than this here.
If someone confirms I'll bake it into a real patch.
-Daniel
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index ef921fa09a84..c990fe9cc0cf 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -401,16 +401,13 @@ int drm_connector_register_all(struct drm_device *dev)
struct drm_connector *connector;
int ret;
- mutex_lock(&dev->mode_config.mutex);
-
- drm_for_each_connector(connector, dev) {
+ /* FIXME: taking the mode config mutex ends up in a clash with sysfs */
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
ret = drm_connector_register(connector);
if (ret)
goto err;
}
- mutex_unlock(&dev->mode_config.mutex);
-
return 0;
err:
>
> BR,
> Jani.
>
>
> > -Daniel
> >
> >>
> >> [ 18.983763] ======================================================
> >> [ 18.983763] [ INFO: possible circular locking dependency detected ]
> >> [ 18.983766] 4.7.0-rc5+ #524 Tainted: G O
> >> [ 18.983767] -------------------------------------------------------
> >> [ 18.983767] kworker/u8:0/6 is trying to acquire lock:
> >> [ 18.983777] (&dev->mode_config.mutex){+.+.+.}, at:
> >> [<ffffffff815afde0>] drm_modeset_lock_all+0x40/0x120
> >> [ 18.983777]
> >> but task is already holding lock:
> >> [ 18.983782] ((fb_notifier_list).rwsem){++++.+}, at:
> >> [<ffffffff810ac195>] __blocking_notifier_call_chain+0x35/0x70
> >> [ 18.983783]
> >> which lock already depends on the new lock.
> >>
> >> [ 18.983783]
> >> the existing dependency chain (in reverse order) is:
> >> [ 18.983785]
> >> -> #1 ((fb_notifier_list).rwsem){++++.+}:
> >> [ 18.983789] [<ffffffff810df611>] lock_acquire+0xb1/0x200
> >> [ 18.983792] [<ffffffff819a55b4>] down_write+0x44/0x80
> >> [ 18.983795] [<ffffffff810abf91>]
> >> blocking_notifier_chain_register+0x21/0xb0
> >> [ 18.983798] [<ffffffff814c7448>] fb_register_client+0x18/0x20
> >> [ 18.983800] [<ffffffff814c6c86>]
> >> backlight_device_register+0x136/0x260
> >> [ 18.983852] [<ffffffffa0127eb2>]
> >> intel_backlight_device_register+0xa2/0x160 [i915]
> >> [ 18.983892] [<ffffffffa00f46be>]
> >> intel_connector_register+0xe/0x10 [i915]
> >> [ 18.983932] [<ffffffffa0112bfb>]
> >> intel_dp_connector_register+0x1b/0x80 [i915]
> >> [ 18.983936] [<ffffffff8159dfea>] drm_connector_register+0x4a/0x80
> >> [ 18.983938] [<ffffffff8159fe44>]
> >> drm_connector_register_all+0x64/0xf0
> >> [ 18.983940] [<ffffffff815a2a64>]
> >> drm_modeset_register_all+0x174/0x1c0
> >> [ 18.983942] [<ffffffff81599b72>] drm_dev_register+0xc2/0xd0
> >> [ 18.983976] [<ffffffffa00621d7>] i915_driver_load+0x1547/0x2200
> >> [i915]
> >> [ 18.984010] [<ffffffffa006d80f>] i915_pci_probe+0x4f/0x70 [i915]
> >> [ 18.984014] [<ffffffff814a2135>] local_pci_probe+0x45/0xa0
> >> [ 18.984015] [<ffffffff814a349b>] pci_device_probe+0xdb/0x130
> >> [ 18.984018] [<ffffffff815c07e3>] driver_probe_device+0x223/0x440
> >> [ 18.984020] [<ffffffff815c0ad5>] __driver_attach+0xd5/0x100
> >> [ 18.984022] [<ffffffff815be386>] bus_for_each_dev+0x66/0xa0
> >> [ 18.984023] [<ffffffff815c002e>] driver_attach+0x1e/0x20
> >> [ 18.984025] [<ffffffff815bf9be>] bus_add_driver+0x1ee/0x280
> >> [ 18.984028] [<ffffffff815c1810>] driver_register+0x60/0xe0
> >> [ 18.984030] [<ffffffff814a1a10>] __pci_register_driver+0x60/0x70
> >> [ 18.984063] [<ffffffffa01a905b>] i915_init+0x5b/0x62 [i915]
> >> [ 18.984067] [<ffffffff8100042d>] do_one_initcall+0x3d/0x150
> >> [ 18.984070] [<ffffffff811a935b>] do_init_module+0x5f/0x1d9
> >> [ 18.984073] [<ffffffff81124416>] load_module+0x20e6/0x27e0
> >> [ 18.984075] [<ffffffff81124d63>] SYSC_finit_module+0xc3/0xf0
> >> [ 18.984076] [<ffffffff81124dae>] SyS_finit_module+0xe/0x10
> >> [ 18.984079] [<ffffffff819a83a9>]
> >> entry_SYSCALL_64_fastpath+0x1c/0xac
> >> [ 18.984081]
> >> -> #0 (&dev->mode_config.mutex){+.+.+.}:
> >> [ 18.984083] [<ffffffff810df0ac>] __lock_acquire+0x10fc/0x1260
> >> [ 18.984085] [<ffffffff810df611>] lock_acquire+0xb1/0x200
> >> [ 18.984088] [<ffffffff819a3097>] mutex_lock_nested+0x67/0x3c0
> >> [ 18.984090] [<ffffffff815afde0>] drm_modeset_lock_all+0x40/0x120
> >> [ 18.984093] [<ffffffff8158f79b>]
> >> drm_fb_helper_restore_fbdev_mode_unlocked+0x2b/0x80
> >> [ 18.984095] [<ffffffff8158f81d>] drm_fb_helper_set_par+0x2d/0x50
> >> [ 18.984134] [<ffffffffa0105f7a>] intel_fbdev_set_par+0x1a/0x60
> >> [i915]
> >> [ 18.984136] [<ffffffff814c13c6>] fbcon_init+0x586/0x610
> >> [ 18.984139] [<ffffffff8154d16a>] visual_init+0xca/0x130
> >> [ 18.984141] [<ffffffff8154e611>] do_bind_con_driver+0x1c1/0x3a0
> >> [ 18.984143] [<ffffffff8154eaf6>] do_take_over_console+0x116/0x180
> >> [ 18.984145] [<ffffffff814bd3a7>] do_fbcon_takeover+0x57/0xb0
> >> [ 18.984147] [<ffffffff814c1e48>] fbcon_event_notify+0x658/0x750
> >> [ 18.984150] [<ffffffff810abcae>] notifier_call_chain+0x3e/0xb0
> >> [ 18.984152] [<ffffffff810ac1ad>]
> >> __blocking_notifier_call_chain+0x4d/0x70
> >> [ 18.984154] [<ffffffff810ac1e6>]
> >> blocking_notifier_call_chain+0x16/0x20
> >> [ 18.984156] [<ffffffff814c748b>] fb_notifier_call_chain+0x1b/0x20
> >> [ 18.984158] [<ffffffff814c86b1>] register_framebuffer+0x251/0x330
> >> [ 18.984160] [<ffffffff8158fa9f>]
> >> drm_fb_helper_initial_config+0x25f/0x3f0
> >> [ 18.984199] [<ffffffffa0106b48>]
> >> intel_fbdev_initial_config+0x18/0x30 [i915]
> >> [ 18.984201] [<ffffffff810adfd8>] async_run_entry_fn+0x48/0x150
> >> [ 18.984203] [<ffffffff810a3947>] process_one_work+0x1e7/0x750
> >> [ 18.984205] [<ffffffff810a3efb>] worker_thread+0x4b/0x4f0
> >> [ 18.984207] [<ffffffff810aad4f>] kthread+0xef/0x110
> >> [ 18.984208] [<ffffffff819a85ef>] ret_from_fork+0x1f/0x40
> >> [ 18.984209]
> >> other info that might help us debug this:
> >>
> >> [ 18.984210] Possible unsafe locking scenario:
> >>
> >> [ 18.984210] CPU0 CPU1
> >> [ 18.984211] ---- ----
> >> [ 18.984212] lock((fb_notifier_list).rwsem);
> >> [ 18.984213]
> >> lock(&dev->mode_config.mutex);
> >> [ 18.984215]
> >> lock((fb_notifier_list).rwsem);
> >> [ 18.984216] lock(&dev->mode_config.mutex);
> >> [ 18.984216]
> >> *** DEADLOCK ***
> >>
> >> [ 18.984217] 6 locks held by kworker/u8:0/6:
> >> [ 18.984220] #0: ("events_unbound"){.+.+.+}, at: [<ffffffff810a38c9>]
> >> process_one_work+0x169/0x750
> >> [ 18.984223] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff810a38c9>]
> >> process_one_work+0x169/0x750
> >> [ 18.984227] #2: (registration_lock){+.+.+.}, at: [<ffffffff814c8487>]
> >> register_framebuffer+0x27/0x330
> >> [ 18.984231] #3: (console_lock){+.+.+.}, at: [<ffffffff814c86ce>]
> >> register_framebuffer+0x26e/0x330
> >> [ 18.984234] #4: (&fb_info->lock){+.+.+.}, at: [<ffffffff814c78dd>]
> >> lock_fb_info+0x1d/0x40
> >> [ 18.984238] #5: ((fb_notifier_list).rwsem){++++.+}, at:
> >> [<ffffffff810ac195>] __blocking_notifier_call_chain+0x35/0x70
> >> [ 18.984238]
> >> stack backtrace:
> >> [ 18.984241] CPU: 2 PID: 6 Comm: kworker/u8:0 Tainted: G O
> >> 4.7.0-rc5+ #524
> >> [ 18.984242] Hardware name: Intel Corp. Broxton P/NOTEBOOK, BIOS
> >> APLKRVPA.X64.0138.B33.1606250842 06/25/2016
> >> [ 18.984244] Workqueue: events_unbound async_run_entry_fn
> >> [ 18.984248] 0000000000000000 ffff8800758577f0 ffffffff814507a5
> >> ffffffff828b9900
> >> [ 18.984250] ffffffff828b9900 ffff880075857830 ffffffff810dc6fa
> >> ffff880075857880
> >> [ 18.984252] ffff88007584d688 0000000000000005 0000000000000006
> >> ffff88007584d6b0
> >> [ 18.984253] Call Trace:
> >> [ 18.984257] [<ffffffff814507a5>] dump_stack+0x67/0x92
> >> [ 18.984259] [<ffffffff810dc6fa>] print_circular_bug+0x1aa/0x200
> >> [ 18.984261] [<ffffffff810df0ac>] __lock_acquire+0x10fc/0x1260
> >> [ 18.984264] [<ffffffff810df611>] lock_acquire+0xb1/0x200
> >> [ 18.984266] [<ffffffff815afde0>] ? drm_modeset_lock_all+0x40/0x120
> >> [ 18.984267] [<ffffffff815afde0>] ? drm_modeset_lock_all+0x40/0x120
> >> [ 18.984269] [<ffffffff819a3097>] mutex_lock_nested+0x67/0x3c0
> >> [ 18.984271] [<ffffffff815afde0>] ? drm_modeset_lock_all+0x40/0x120
> >> [ 18.984273] [<ffffffff810fa85f>] ? rcu_read_lock_sched_held+0x7f/0x90
> >> [ 18.984276] [<ffffffff81208218>] ? kmem_cache_alloc_trace+0x248/0x2b0
> >> [ 18.984277] [<ffffffff815afdc5>] ? drm_modeset_lock_all+0x25/0x120
> >> [ 18.984279] [<ffffffff815afde0>] drm_modeset_lock_all+0x40/0x120
> >> [ 18.984281] [<ffffffff8158f79b>]
> >> drm_fb_helper_restore_fbdev_mode_unlocked+0x2b/0x80
> >> [ 18.984283] [<ffffffff8158f81d>] drm_fb_helper_set_par+0x2d/0x50
> >> [ 18.984322] [<ffffffffa0105f7a>] intel_fbdev_set_par+0x1a/0x60 [i915]
> >> [ 18.984324] [<ffffffff814c13c6>] fbcon_init+0x586/0x610
> >> [ 18.984326] [<ffffffff8154d16a>] visual_init+0xca/0x130
> >> [ 18.984328] [<ffffffff8154e611>] do_bind_con_driver+0x1c1/0x3a0
> >> [ 18.984330] [<ffffffff8154eaf6>] do_take_over_console+0x116/0x180
> >> [ 18.984332] [<ffffffff814bd3a7>] do_fbcon_takeover+0x57/0xb0
> >> [ 18.984334] [<ffffffff814c1e48>] fbcon_event_notify+0x658/0x750
> >> [ 18.984336] [<ffffffff810abcae>] notifier_call_chain+0x3e/0xb0
> >> [ 18.984338] [<ffffffff810ac1ad>]
> >> __blocking_notifier_call_chain+0x4d/0x70
> >> [ 18.984340] [<ffffffff810ac1e6>] blocking_notifier_call_chain+0x16/0x20
> >> [ 18.984342] [<ffffffff814c748b>] fb_notifier_call_chain+0x1b/0x20
> >> [ 18.984344] [<ffffffff814c86b1>] register_framebuffer+0x251/0x330
> >> [ 18.984347] [<ffffffff815b7e8d>] ?
> >> vga_switcheroo_client_fb_set+0x5d/0x70
> >> [ 18.984349] [<ffffffff8158fa9f>]
> >> drm_fb_helper_initial_config+0x25f/0x3f0
> >> [ 18.984388] [<ffffffffa0106b48>] intel_fbdev_initial_config+0x18/0x30
> >> [i915]
> >> [ 18.984389] [<ffffffff810adfd8>] async_run_entry_fn+0x48/0x150
> >> [ 18.984391] [<ffffffff810a3947>] process_one_work+0x1e7/0x750
> >> [ 18.984392] [<ffffffff810a38c9>] ? process_one_work+0x169/0x750
> >> [ 18.984394] [<ffffffff810a3efb>] worker_thread+0x4b/0x4f0
> >> [ 18.984396] [<ffffffff810a3eb0>] ? process_one_work+0x750/0x750
> >> [ 18.984398] [<ffffffff810aad4f>] kthread+0xef/0x110
> >> [ 18.984401] [<ffffffff819a85ef>] ret_from_fork+0x1f/0x40
> >> [ 18.984402] [<ffffffff810aac60>] ? kthread_stop+0x2e0/0x2e0
> >>
> >> Reported-by: Imre Deak <imre.deak at intel.com>
> >> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> >> Cc: Imre Deak <imre.deak at intel.com>
> >> Cc: Zhang Rui <rui.zhang at intel.com>
> >> Cc: Alex Deucher <alexander.deucher at amd.com>
> >> Cc: "Christian König" <christian.koenig at amd.com>
> >> Cc: David Airlie <airlied at linux.ie>
> >> Cc: Patrik Jakobsson <patrik.r.jakobsson at gmail.com>
> >> Cc: Daniel Vetter <daniel.vetter at intel.com>
> >> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> >> Cc: Ben Skeggs <bskeggs at redhat.com>
> >> Cc: Tomi Valkeinen <tomi.valkeinen at ti.com>
> >> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> >> Cc: "Bruno Prémont" <bonbons at linux-vserver.org>
> >> Cc: Jiri Kosina <jikos at kernel.org>
> >> Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> >> Cc: "Noralf Trønnes" <noralf at tronnes.org>
> >> Cc: Jens Frederich <jfrederich at gmail.com>
> >> Cc: Daniel Drake <dsd at laptop.org>
> >> Cc: Jon Nettleton <jon.nettleton at gmail.com>
> >> Cc: Jingoo Han <jingoohan1 at gmail.com>
> >> Cc: Lee Jones <lee.jones at linaro.org>
> >> Cc: Jean-Christophe Plagniol-Villard <plagnioj at jcrosoft.com>
> >> Cc: Michael Hennerich <michael.hennerich at analog.com>
> >> Cc: Milo Kim <milo.kim at ti.com>
> >> Cc: Thierry Reding <thierry.reding at gmail.com>
> >> Cc: Nicolas Ferre <nicolas.ferre at atmel.com>
> >> Cc: Paul Mackerras <paulus at samba.org>
> >> Cc: Kukjin Kim <kgene at kernel.org>
> >> Cc: Krzysztof Kozlowski <k.kozlowski at samsung.com>
> >> Cc: Antonino Daplas <adaplas at gmail.com>
> >> Cc: linux-acpi at vger.kernel.org
> >> Cc: dri-devel at lists.freedesktop.org
> >> Cc: intel-gfx at lists.freedesktop.org
> >> Cc: nouveau at lists.freedesktop.org
> >> Cc: linux-renesas-soc at vger.kernel.org
> >> Cc: linux-fbdev at vger.kernel.org
> >> Cc: linux-omap at vger.kernel.org
> >> ---
> >> drivers/acpi/acpi_video.c | 3 ++-
> >> drivers/gpu/drm/amd/amdgpu/atombios_encoders.c | 3 ++-
> >> drivers/gpu/drm/bridge/parade-ps8622.c | 3 ++-
> >> drivers/gpu/drm/gma500/cdv_device.c | 3 ++-
> >> drivers/gpu/drm/gma500/mdfld_device.c | 3 ++-
> >> drivers/gpu/drm/gma500/oaktrail_device.c | 3 ++-
> >> drivers/gpu/drm/gma500/psb_device.c | 3 ++-
> >> drivers/gpu/drm/i915/intel_panel.c | 3 ++-
> >> drivers/gpu/drm/nouveau/nouveau_backlight.c | 6 ++++--
> >> drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 3 ++-
> >> .../gpu/drm/omapdrm/displays/panel-sony-acx565akm.c | 3 ++-
> >> drivers/gpu/drm/radeon/atombios_encoders.c | 3 ++-
> >> drivers/gpu/drm/radeon/radeon_legacy_encoders.c | 3 ++-
> >> drivers/gpu/drm/shmobile/shmob_drm_backlight.c | 3 ++-
> >> drivers/hid/hid-picolcd_backlight.c | 3 ++-
> >> drivers/macintosh/via-pmu-backlight.c | 3 ++-
> >> drivers/platform/x86/acer-wmi.c | 3 ++-
> >> drivers/platform/x86/apple-gmux.c | 3 ++-
> >> drivers/platform/x86/asus-laptop.c | 3 ++-
> >> drivers/platform/x86/asus-wmi.c | 3 ++-
> >> drivers/platform/x86/classmate-laptop.c | 3 ++-
> >> drivers/platform/x86/compal-laptop.c | 3 ++-
> >> drivers/platform/x86/dell-laptop.c | 3 ++-
> >> drivers/platform/x86/eeepc-laptop.c | 3 ++-
> >> drivers/platform/x86/fujitsu-laptop.c | 3 ++-
> >> drivers/platform/x86/ideapad-laptop.c | 3 ++-
> >> drivers/platform/x86/intel_oaktrail.c | 3 ++-
> >> drivers/platform/x86/msi-laptop.c | 3 ++-
> >> drivers/platform/x86/msi-wmi.c | 3 ++-
> >> drivers/platform/x86/panasonic-laptop.c | 3 ++-
> >> drivers/platform/x86/samsung-laptop.c | 3 ++-
> >> drivers/platform/x86/samsung-q10.c | 3 ++-
> >> drivers/platform/x86/sony-laptop.c | 3 ++-
> >> drivers/platform/x86/thinkpad_acpi.c | 3 ++-
> >> drivers/platform/x86/toshiba_acpi.c | 3 ++-
> >> drivers/staging/fbtft/fb_ssd1351.c | 3 ++-
> >> drivers/staging/fbtft/fb_watterott.c | 3 ++-
> >> drivers/staging/fbtft/fbtft-core.c | 3 ++-
> >> drivers/staging/olpc_dcon/olpc_dcon.c | 3 ++-
> >> drivers/usb/misc/appledisplay.c | 3 ++-
> >> drivers/video/backlight/88pm860x_bl.c | 3 ++-
> >> drivers/video/backlight/aat2870_bl.c | 3 ++-
> >> drivers/video/backlight/adp5520_bl.c | 3 ++-
> >> drivers/video/backlight/adp8860_bl.c | 3 ++-
> >> drivers/video/backlight/adp8870_bl.c | 3 ++-
> >> drivers/video/backlight/ams369fg06.c | 3 ++-
> >> drivers/video/backlight/apple_bl.c | 3 ++-
> >> drivers/video/backlight/as3711_bl.c | 3 ++-
> >> drivers/video/backlight/backlight.c | 20
> >> +++++++++++++-------
> >> drivers/video/backlight/bd6107.c | 3 ++-
> >> drivers/video/backlight/corgi_lcd.c | 3 ++-
> >> drivers/video/backlight/cr_bllcd.c | 3 ++-
> >> drivers/video/backlight/da903x_bl.c | 3 ++-
> >> drivers/video/backlight/da9052_bl.c | 3 ++-
> >> drivers/video/backlight/ep93xx_bl.c | 3 ++-
> >> drivers/video/backlight/generic_bl.c | 3 ++-
> >> drivers/video/backlight/gpio_backlight.c | 3 ++-
> >> drivers/video/backlight/hp680_bl.c | 3 ++-
> >> drivers/video/backlight/ipaq_micro_bl.c | 3 ++-
> >> drivers/video/backlight/jornada720_bl.c | 3 ++-
> >> drivers/video/backlight/kb3886_bl.c | 3 ++-
> >> drivers/video/backlight/ld9040.c | 3 ++-
> >> drivers/video/backlight/lm3533_bl.c | 3 ++-
> >> drivers/video/backlight/lm3630a_bl.c | 6 ++++--
> >> drivers/video/backlight/lm3639_bl.c | 3 ++-
> >> drivers/video/backlight/locomolcd.c | 3 ++-
> >> drivers/video/backlight/lp855x_bl.c | 3 ++-
> >> drivers/video/backlight/lp8788_bl.c | 3 ++-
> >> drivers/video/backlight/lv5207lp.c | 3 ++-
> >> drivers/video/backlight/max8925_bl.c | 3 ++-
> >> drivers/video/backlight/omap1_bl.c | 3 ++-
> >> drivers/video/backlight/ot200_bl.c | 3 ++-
> >> drivers/video/backlight/pandora_bl.c | 3 ++-
> >> drivers/video/backlight/pcf50633-backlight.c | 3 ++-
> >> drivers/video/backlight/pm8941-wled.c | 3 ++-
> >> drivers/video/backlight/pwm_bl.c | 3 ++-
> >> drivers/video/backlight/s6e63m0.c | 3 ++-
> >> drivers/video/backlight/sky81452-backlight.c | 3 ++-
> >> drivers/video/backlight/tosa_bl.c | 3 ++-
> >> drivers/video/backlight/tps65217_bl.c | 3 ++-
> >> drivers/video/backlight/wm831x_bl.c | 3 ++-
> >> drivers/video/fbdev/atmel_lcdfb.c | 3 ++-
> >> drivers/video/fbdev/aty/aty128fb.c | 3 ++-
> >> drivers/video/fbdev/aty/atyfb_base.c | 3 ++-
> >> drivers/video/fbdev/aty/radeon_backlight.c | 3 ++-
> >> drivers/video/fbdev/bf537-lq035.c | 3 ++-
> >> drivers/video/fbdev/bf54x-lq043fb.c | 3 ++-
> >> drivers/video/fbdev/bfin-t350mcqb-fb.c | 3 ++-
> >> drivers/video/fbdev/exynos/s6e8ax0.c | 3 ++-
> >> drivers/video/fbdev/mx3fb.c | 3 ++-
> >> drivers/video/fbdev/nvidia/nv_backlight.c | 3 ++-
> >> .../video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c | 3 ++-
> >> .../omap2/omapfb/displays/panel-sony-acx565akm.c | 3 ++-
> >> drivers/video/fbdev/riva/fbdev.c | 3 ++-
> >> drivers/video/fbdev/sh_mobile_lcdcfb.c | 3 ++-
> >> drivers/video/fbdev/ssd1307fb.c | 3 ++-
> >> include/linux/backlight.h | 7 +++++--
> >> 97 files changed, 212 insertions(+), 106 deletions(-)
> >>
> >> diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
> >> index c1d138e128cb..49e0acb70c17 100644
> >> --- a/drivers/acpi/acpi_video.c
> >> +++ b/drivers/acpi/acpi_video.c
> >> @@ -1693,7 +1693,8 @@ static void acpi_video_dev_register_backlight(struct
> >> acpi_video_device *device)
> >> parent,
> >> device,
> >> &acpi_backlight_ops,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> kfree(name);
> >> if (IS_ERR(device->backlight)) {
> >> device->backlight = NULL;
> >> diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> >> b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> >> index 48b6bd671cda..b6ae67a75a25 100644
> >> --- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> >> +++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> >> @@ -198,7 +198,8 @@ void amdgpu_atombios_encoder_init_backlight(struct
> >> amdgpu_encoder *amdgpu_encode
> >> snprintf(bl_name, sizeof(bl_name),
> >> "amdgpu_bl%d", dev->primary->index);
> >> bd = backlight_device_register(bl_name, drm_connector->kdev,
> >> - pdata,
> >> &amdgpu_atombios_encoder_backlight_ops, &props);
> >> + pdata,
> >> &amdgpu_atombios_encoder_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> DRM_ERROR("Backlight registration failed\n");
> >> goto error;
> >> diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c
> >> b/drivers/gpu/drm/bridge/parade-ps8622.c
> >> index 5cd8dd7e5904..14dea711b474 100644
> >> --- a/drivers/gpu/drm/bridge/parade-ps8622.c
> >> +++ b/drivers/gpu/drm/bridge/parade-ps8622.c
> >> @@ -608,7 +608,8 @@ static int ps8622_probe(struct i2c_client *client,
> >> if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
> >> ps8622->bl = backlight_device_register("ps8622-backlight",
> >> dev, ps8622, &ps8622_backlight_ops,
> >> - NULL);
> >> + NULL,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(ps8622->bl)) {
> >> DRM_ERROR("failed to register backlight\n");
> >> ret = PTR_ERR(ps8622->bl);
> >> diff --git a/drivers/gpu/drm/gma500/cdv_device.c
> >> b/drivers/gpu/drm/gma500/cdv_device.c
> >> index 8745971a7680..d2b4d645b4db 100644
> >> --- a/drivers/gpu/drm/gma500/cdv_device.c
> >> +++ b/drivers/gpu/drm/gma500/cdv_device.c
> >> @@ -163,7 +163,8 @@ static int cdv_backlight_init(struct drm_device *dev)
> >> props.type = BACKLIGHT_PLATFORM;
> >>
> >> cdv_backlight_device = backlight_device_register("psb-bl",
> >> - NULL, (void *)dev, &cdv_ops, &props);
> >> + NULL, (void *)dev, &cdv_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(cdv_backlight_device))
> >> return PTR_ERR(cdv_backlight_device);
> >>
> >> diff --git a/drivers/gpu/drm/gma500/mdfld_device.c
> >> b/drivers/gpu/drm/gma500/mdfld_device.c
> >> index e2ab858122f9..2e24ecccfd39 100644
> >> --- a/drivers/gpu/drm/gma500/mdfld_device.c
> >> +++ b/drivers/gpu/drm/gma500/mdfld_device.c
> >> @@ -130,7 +130,8 @@ static int mdfld_backlight_init(struct drm_device *dev)
> >> props.max_brightness = BRIGHTNESS_MAX_LEVEL;
> >> props.type = BACKLIGHT_PLATFORM;
> >> mdfld_backlight_device = backlight_device_register("mdfld-bl",
> >> - NULL, (void *)dev, &mdfld_ops, &props);
> >> + NULL, (void *)dev, &mdfld_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(mdfld_backlight_device))
> >> return PTR_ERR(mdfld_backlight_device);
> >> diff --git a/drivers/gpu/drm/gma500/oaktrail_device.c
> >> b/drivers/gpu/drm/gma500/oaktrail_device.c
> >> index ba30b43a3412..034553a524ac 100644
> >> --- a/drivers/gpu/drm/gma500/oaktrail_device.c
> >> +++ b/drivers/gpu/drm/gma500/oaktrail_device.c
> >> @@ -155,7 +155,8 @@ static int oaktrail_backlight_init(struct drm_device
> >> *dev)
> >> props.type = BACKLIGHT_PLATFORM;
> >>
> >> oaktrail_backlight_device = backlight_device_register("oaktrail-bl",
> >> - NULL, (void *)dev, &oaktrail_ops, &props);
> >> + NULL, (void *)dev, &oaktrail_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(oaktrail_backlight_device))
> >> return PTR_ERR(oaktrail_backlight_device);
> >> diff --git a/drivers/gpu/drm/gma500/psb_device.c
> >> b/drivers/gpu/drm/gma500/psb_device.c
> >> index dc0f8527570c..0c1385d64839 100644
> >> --- a/drivers/gpu/drm/gma500/psb_device.c
> >> +++ b/drivers/gpu/drm/gma500/psb_device.c
> >> @@ -131,7 +131,8 @@ static int psb_backlight_init(struct drm_device *dev)
> >> props.type = BACKLIGHT_PLATFORM;
> >>
> >> psb_backlight_device = backlight_device_register("psb-bl",
> >> - NULL, (void *)dev, &psb_ops, &props);
> >> + NULL, (void *)dev, &psb_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(psb_backlight_device))
> >> return PTR_ERR(psb_backlight_device);
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_panel.c
> >> b/drivers/gpu/drm/i915/intel_panel.c
> >> index 3c0b97f0bfae..acf6395b9f33 100644
> >> --- a/drivers/gpu/drm/i915/intel_panel.c
> >> +++ b/drivers/gpu/drm/i915/intel_panel.c
> >> @@ -1201,7 +1201,8 @@ int intel_backlight_device_register(struct
> >> intel_connector *connector)
> >> backlight_device_register("intel_backlight",
> >> connector->base.kdev,
> >> connector,
> >> - &intel_backlight_device_ops, &props);
> >> + &intel_backlight_device_ops, &props,
> >> + 0);
> >>
> >> if (IS_ERR(panel->backlight.device)) {
> >> DRM_ERROR("Failed to register backlight: %ld\n",
> >> diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c
> >> b/drivers/gpu/drm/nouveau/nouveau_backlight.c
> >> index f5101be806cb..5fd7e7498f13 100644
> >> --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
> >> +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
> >> @@ -82,7 +82,8 @@ nv40_backlight_init(struct drm_connector *connector)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 31;
> >> bd = backlight_device_register("nv_backlight", connector->kdev, drm,
> >> - &nv40_bl_ops, &props);
> >> + &nv40_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >> drm->backlight = bd;
> >> @@ -204,7 +205,8 @@ nv50_backlight_init(struct drm_connector *connector)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 100;
> >> bd = backlight_device_register("nv_backlight", connector->kdev,
> >> - nv_encoder, ops, &props);
> >> + nv_encoder, ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> >> b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> >> index 1b0cf2d8224b..10511bdd9936 100644
> >> --- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> >> +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
> >> @@ -1260,7 +1260,8 @@ static int dsicm_probe(struct platform_device *pdev)
> >>
> >> props.type = BACKLIGHT_RAW;
> >> bldev = backlight_device_register(dev_name(dev),
> >> - dev, ddata, &dsicm_bl_ops, &props);
> >> + dev, ddata, &dsicm_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bldev)) {
> >> r = PTR_ERR(bldev);
> >> goto err_bl;
> >> diff --git a/drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c
> >> b/drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c
> >> index 157c512205d1..9f3622910511 100644
> >> --- a/drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c
> >> +++ b/drivers/gpu/drm/omapdrm/displays/panel-sony-acx565akm.c
> >> @@ -817,7 +817,8 @@ static int acx565akm_probe(struct spi_device *spi)
> >> props.type = BACKLIGHT_RAW;
> >>
> >> bldev = backlight_device_register("acx565akm", &ddata->spi->dev,
> >> - ddata, &acx565akm_bl_ops, &props);
> >> + ddata, &acx565akm_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bldev)) {
> >> r = PTR_ERR(bldev);
> >> goto err_reg_bl;
> >> diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c
> >> b/drivers/gpu/drm/radeon/atombios_encoders.c
> >> index 587cae4e73c9..3676ba6e16ee 100644
> >> --- a/drivers/gpu/drm/radeon/atombios_encoders.c
> >> +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
> >> @@ -214,7 +214,8 @@ void radeon_atom_backlight_init(struct radeon_encoder
> >> *radeon_encoder,
> >> snprintf(bl_name, sizeof(bl_name),
> >> "radeon_bl%d", dev->primary->index);
> >> bd = backlight_device_register(bl_name, drm_connector->kdev,
> >> - pdata, &radeon_atom_backlight_ops,
> >> &props);
> >> + pdata, &radeon_atom_backlight_ops,
> >> &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> DRM_ERROR("Backlight registration failed\n");
> >> goto error;
> >> diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> >> b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> >> index 868c3ba2efaa..27908624c818 100644
> >> --- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> >> +++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
> >> @@ -393,7 +393,8 @@ void radeon_legacy_backlight_init(struct
> >> radeon_encoder *radeon_encoder,
> >> snprintf(bl_name, sizeof(bl_name),
> >> "radeon_bl%d", dev->primary->index);
> >> bd = backlight_device_register(bl_name, drm_connector->kdev,
> >> - pdata, &radeon_backlight_ops, &props);
> >> + pdata, &radeon_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> DRM_ERROR("Backlight registration failed\n");
> >> goto error;
> >> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> >> b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> >> index 33dd41afea0e..1ff10faed3a7 100644
> >> --- a/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> >> +++ b/drivers/gpu/drm/shmobile/shmob_drm_backlight.c
> >> @@ -68,7 +68,8 @@ int shmob_drm_backlight_init(struct shmob_drm_connector
> >> *scon)
> >> return 0;
> >>
> >> backlight = backlight_device_register(bdata->name, dev->dev, scon,
> >> - &shmob_drm_backlight_ops, NULL);
> >> + &shmob_drm_backlight_ops, NULL,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(backlight)) {
> >> dev_err(dev->dev, "unable to register backlight device: %ld\n",
> >> PTR_ERR(backlight));
> >> diff --git a/drivers/hid/hid-picolcd_backlight.c
> >> b/drivers/hid/hid-picolcd_backlight.c
> >> index 808807ad388f..06597f50c32b 100644
> >> --- a/drivers/hid/hid-picolcd_backlight.c
> >> +++ b/drivers/hid/hid-picolcd_backlight.c
> >> @@ -77,7 +77,8 @@ int picolcd_init_backlight(struct picolcd_data *data,
> >> struct hid_report *report)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 0xff;
> >> bdev = backlight_device_register(dev_name(dev), dev, data,
> >> - &picolcd_blops, &props);
> >> + &picolcd_blops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bdev)) {
> >> dev_err(dev, "failed to register backlight\n");
> >> return PTR_ERR(bdev);
> >> diff --git a/drivers/macintosh/via-pmu-backlight.c
> >> b/drivers/macintosh/via-pmu-backlight.c
> >> index 6f68537c93ce..da0fb2e87f75 100644
> >> --- a/drivers/macintosh/via-pmu-backlight.c
> >> +++ b/drivers/macintosh/via-pmu-backlight.c
> >> @@ -160,7 +160,8 @@ void __init pmu_backlight_init()
> >> props.type = BACKLIGHT_PLATFORM;
> >> props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
> >> bd = backlight_device_register(name, NULL, NULL, &pmu_backlight_data,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> printk(KERN_ERR "PMU Backlight registration failed\n");
> >> return;
> >> diff --git a/drivers/platform/x86/acer-wmi.c
> >> b/drivers/platform/x86/acer-wmi.c
> >> index 79d64ea00bfb..0b17c5146175 100644
> >> --- a/drivers/platform/x86/acer-wmi.c
> >> +++ b/drivers/platform/x86/acer-wmi.c
> >> @@ -1419,7 +1419,8 @@ static int acer_backlight_init(struct device *dev)
> >> props.type = BACKLIGHT_PLATFORM;
> >> props.max_brightness = max_brightness;
> >> bd = backlight_device_register("acer-wmi", dev, NULL, &acer_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> pr_err("Could not register Acer backlight device\n");
> >> acer_backlight_device = NULL;
> >> diff --git a/drivers/platform/x86/apple-gmux.c
> >> b/drivers/platform/x86/apple-gmux.c
> >> index 4034d2d4c507..e041bbe14df5 100644
> >> --- a/drivers/platform/x86/apple-gmux.c
> >> +++ b/drivers/platform/x86/apple-gmux.c
> >> @@ -698,7 +698,8 @@ static int gmux_probe(struct pnp_dev *pnp, const
> >> struct pnp_device_id *id)
> >> props.max_brightness = GMUX_MAX_BRIGHTNESS;
> >>
> >> bdev = backlight_device_register("gmux_backlight", &pnp->dev,
> >> - gmux_data, &gmux_bl_ops, &props);
> >> + gmux_data, &gmux_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bdev)) {
> >> ret = PTR_ERR(bdev);
> >> goto err_release;
> >> diff --git a/drivers/platform/x86/asus-laptop.c
> >> b/drivers/platform/x86/asus-laptop.c
> >> index 15f131146501..98f26cff9c96 100644
> >> --- a/drivers/platform/x86/asus-laptop.c
> >> +++ b/drivers/platform/x86/asus-laptop.c
> >> @@ -831,7 +831,8 @@ static int asus_backlight_init(struct asus_laptop
> >> *asus)
> >>
> >> bd = backlight_device_register(ASUS_LAPTOP_FILE,
> >> &asus->platform_device->dev, asus,
> >> - &asusbl_ops, &props);
> >> + &asusbl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> pr_err("Could not register asus backlight device\n");
> >> asus->backlight_device = NULL;
> >> diff --git a/drivers/platform/x86/asus-wmi.c
> >> b/drivers/platform/x86/asus-wmi.c
> >> index a26dca3640ea..ca897bc94626 100644
> >> --- a/drivers/platform/x86/asus-wmi.c
> >> +++ b/drivers/platform/x86/asus-wmi.c
> >> @@ -1565,7 +1565,8 @@ static int asus_wmi_backlight_init(struct asus_wmi
> >> *asus)
> >> props.max_brightness = max;
> >> bd = backlight_device_register(asus->driver->name,
> >> &asus->platform_device->dev, asus,
> >> - &asus_wmi_bl_ops, &props);
> >> + &asus_wmi_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> pr_err("Could not register backlight device\n");
> >> return PTR_ERR(bd);
> >> diff --git a/drivers/platform/x86/classmate-laptop.c
> >> b/drivers/platform/x86/classmate-laptop.c
> >> index 55cf10bc7817..60cf7a0c7170 100644
> >> --- a/drivers/platform/x86/classmate-laptop.c
> >> +++ b/drivers/platform/x86/classmate-laptop.c
> >> @@ -970,7 +970,8 @@ static int cmpc_ipml_add(struct acpi_device *acpi)
> >> props.max_brightness = 7;
> >> ipml->bd = backlight_device_register("cmpc_bl", &acpi->dev,
> >> acpi->handle, &cmpc_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(ipml->bd)) {
> >> retval = PTR_ERR(ipml->bd);
> >> goto out_bd;
> >> diff --git a/drivers/platform/x86/compal-laptop.c
> >> b/drivers/platform/x86/compal-laptop.c
> >> index e1c2b6d4b24a..9a675d3b6fe5 100644
> >> --- a/drivers/platform/x86/compal-laptop.c
> >> +++ b/drivers/platform/x86/compal-laptop.c
> >> @@ -1008,7 +1008,8 @@ static int __init compal_init(void)
> >> compalbl_device = backlight_device_register(DRIVER_NAME,
> >> NULL, NULL,
> >> &compalbl_ops,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(compalbl_device))
> >> return PTR_ERR(compalbl_device);
> >> }
> >> diff --git a/drivers/platform/x86/dell-laptop.c
> >> b/drivers/platform/x86/dell-laptop.c
> >> index 2c2f02b2e08a..57712a970f8d 100644
> >> --- a/drivers/platform/x86/dell-laptop.c
> >> +++ b/drivers/platform/x86/dell-laptop.c
> >> @@ -2035,7 +2035,8 @@ static int __init dell_init(void)
> >>
> >> &platform_device->dev,
> >> NULL,
> >> &dell_ops,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(dell_backlight_device)) {
> >> ret = PTR_ERR(dell_backlight_device);
> >> diff --git a/drivers/platform/x86/eeepc-laptop.c
> >> b/drivers/platform/x86/eeepc-laptop.c
> >> index 8cdf315f9730..da8ada2ba429 100644
> >> --- a/drivers/platform/x86/eeepc-laptop.c
> >> +++ b/drivers/platform/x86/eeepc-laptop.c
> >> @@ -1159,7 +1159,8 @@ static int eeepc_backlight_init(struct eeepc_laptop
> >> *eeepc)
> >> props.max_brightness = 15;
> >> bd = backlight_device_register(EEEPC_LAPTOP_FILE,
> >> &eeepc->platform_device->dev, eeepc,
> >> - &eeepcbl_ops, &props);
> >> + &eeepcbl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> pr_err("Could not register eeepc backlight device\n");
> >> eeepc->backlight_device = NULL;
> >> diff --git a/drivers/platform/x86/fujitsu-laptop.c
> >> b/drivers/platform/x86/fujitsu-laptop.c
> >> index ce41bc34288d..b54e7ea2e968 100644
> >> --- a/drivers/platform/x86/fujitsu-laptop.c
> >> +++ b/drivers/platform/x86/fujitsu-laptop.c
> >> @@ -1167,7 +1167,8 @@ static int __init fujitsu_init(void)
> >> fujitsu->bl_device = backlight_device_register("fujitsu-laptop",
> >> NULL, NULL,
> >> &fujitsubl_ops,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(fujitsu->bl_device)) {
> >> ret = PTR_ERR(fujitsu->bl_device);
> >> fujitsu->bl_device = NULL;
> >> diff --git a/drivers/platform/x86/ideapad-laptop.c
> >> b/drivers/platform/x86/ideapad-laptop.c
> >> index d1a091b93192..99de02efd971 100644
> >> --- a/drivers/platform/x86/ideapad-laptop.c
> >> +++ b/drivers/platform/x86/ideapad-laptop.c
> >> @@ -726,7 +726,8 @@ static int ideapad_backlight_init(struct
> >> ideapad_private *priv)
> >> &priv->platform_device->dev,
> >> priv,
> >> &ideapad_backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(blightdev)) {
> >> pr_err("Could not register backlight device\n");
> >> return PTR_ERR(blightdev);
> >> diff --git a/drivers/platform/x86/intel_oaktrail.c
> >> b/drivers/platform/x86/intel_oaktrail.c
> >> index 6aa33c4a809f..303e8e27a0b9 100644
> >> --- a/drivers/platform/x86/intel_oaktrail.c
> >> +++ b/drivers/platform/x86/intel_oaktrail.c
> >> @@ -253,7 +253,8 @@ static int oaktrail_backlight_init(void)
> >> bd = backlight_device_register(DRIVER_NAME,
> >> &oaktrail_device->dev, NULL,
> >> &oaktrail_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(bd)) {
> >> oaktrail_bl_device = NULL;
> >> diff --git a/drivers/platform/x86/msi-laptop.c
> >> b/drivers/platform/x86/msi-laptop.c
> >> index 42317704629d..81990bdab229 100644
> >> --- a/drivers/platform/x86/msi-laptop.c
> >> +++ b/drivers/platform/x86/msi-laptop.c
> >> @@ -1078,7 +1078,8 @@ static int __init msi_init(void)
> >> props.max_brightness = MSI_LCD_LEVEL_MAX - 1;
> >> msibl_device = backlight_device_register("msi-laptop-bl", NULL,
> >> NULL, &msibl_ops,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(msibl_device))
> >> return PTR_ERR(msibl_device);
> >> }
> >> diff --git a/drivers/platform/x86/msi-wmi.c
> >> b/drivers/platform/x86/msi-wmi.c
> >> index 978e6d640572..5174572a7859 100644
> >> --- a/drivers/platform/x86/msi-wmi.c
> >> +++ b/drivers/platform/x86/msi-wmi.c
> >> @@ -247,7 +247,8 @@ static int __init msi_wmi_backlight_setup(void)
> >> props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
> >> backlight = backlight_device_register(DRV_NAME, NULL, NULL,
> >> &msi_backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(backlight))
> >> return PTR_ERR(backlight);
> >>
> >> diff --git a/drivers/platform/x86/panasonic-laptop.c
> >> b/drivers/platform/x86/panasonic-laptop.c
> >> index 3f870972247c..00679814d8c3 100644
> >> --- a/drivers/platform/x86/panasonic-laptop.c
> >> +++ b/drivers/platform/x86/panasonic-laptop.c
> >> @@ -618,7 +618,8 @@ static int acpi_pcc_hotkey_add(struct acpi_device
> >> *device)
> >> props.type = BACKLIGHT_PLATFORM;
> >> props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
> >> pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
> >> - &pcc_backlight_ops, &props);
> >> + &pcc_backlight_ops, &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(pcc->backlight)) {
> >> result = PTR_ERR(pcc->backlight);
> >> goto out_input;
> >> diff --git a/drivers/platform/x86/samsung-laptop.c
> >> b/drivers/platform/x86/samsung-laptop.c
> >> index 8c146e2b6727..09868706dfd6 100644
> >> --- a/drivers/platform/x86/samsung-laptop.c
> >> +++ b/drivers/platform/x86/samsung-laptop.c
> >> @@ -1200,7 +1200,8 @@ static int __init samsung_backlight_init(struct
> >> samsung_laptop *samsung)
> >> bd = backlight_device_register("samsung",
> >> &samsung->platform_device->dev,
> >> samsung, &backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/platform/x86/samsung-q10.c
> >> b/drivers/platform/x86/samsung-q10.c
> >> index e6aac725a0af..cc25d0416236 100644
> >> --- a/drivers/platform/x86/samsung-q10.c
> >> +++ b/drivers/platform/x86/samsung-q10.c
> >> @@ -60,7 +60,8 @@ static int samsungq10_probe(struct platform_device *pdev)
> >> props.type = BACKLIGHT_PLATFORM;
> >> props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
> >> bd = backlight_device_register("samsung", &pdev->dev, NULL,
> >> - &samsungq10_bl_ops, &props);
> >> + &samsungq10_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/platform/x86/sony-laptop.c
> >> b/drivers/platform/x86/sony-laptop.c
> >> index 1dba3598cfcb..a20f30621e5f 100644
> >> --- a/drivers/platform/x86/sony-laptop.c
> >> +++ b/drivers/platform/x86/sony-laptop.c
> >> @@ -3158,7 +3158,8 @@ static void sony_nc_backlight_setup(void)
> >> props.max_brightness = max_brightness;
> >> sony_bl_props.dev = backlight_device_register("sony", NULL,
> >> &sony_bl_props,
> >> - ops, &props);
> >> + ops, &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(sony_bl_props.dev)) {
> >> pr_warn("unable to register backlight device\n");
> >> diff --git a/drivers/platform/x86/thinkpad_acpi.c
> >> b/drivers/platform/x86/thinkpad_acpi.c
> >> index b65ce7519411..987ef89b11da 100644
> >> --- a/drivers/platform/x86/thinkpad_acpi.c
> >> +++ b/drivers/platform/x86/thinkpad_acpi.c
> >> @@ -6821,7 +6821,8 @@ static int __init brightness_init(struct
> >> ibm_init_struct *iibm)
> >> ibm_backlight_device =
> >> backlight_device_register(TPACPI_BACKLIGHT_DEV_NAME,
> >> NULL, NULL,
> >> &ibm_backlight_data,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(ibm_backlight_device)) {
> >> int rc = PTR_ERR(ibm_backlight_device);
> >> ibm_backlight_device = NULL;
> >> diff --git a/drivers/platform/x86/toshiba_acpi.c
> >> b/drivers/platform/x86/toshiba_acpi.c
> >> index 01e12d221a8b..6b0f23360094 100644
> >> --- a/drivers/platform/x86/toshiba_acpi.c
> >> +++ b/drivers/platform/x86/toshiba_acpi.c
> >> @@ -2840,7 +2840,8 @@ static int toshiba_acpi_setup_backlight(struct
> >> toshiba_acpi_dev *dev)
> >> &dev->acpi_dev->dev,
> >> dev,
> >> &toshiba_backlight_data,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(dev->backlight_dev)) {
> >> ret = PTR_ERR(dev->backlight_dev);
> >> pr_err("Could not register toshiba backlight device\n");
> >> diff --git a/drivers/staging/fbtft/fb_ssd1351.c
> >> b/drivers/staging/fbtft/fb_ssd1351.c
> >> index cef33e439f46..6a194faf6448 100644
> >> --- a/drivers/staging/fbtft/fb_ssd1351.c
> >> +++ b/drivers/staging/fbtft/fb_ssd1351.c
> >> @@ -210,7 +210,8 @@ static void register_onboard_backlight(struct
> >> fbtft_par *par)
> >> bl_props.power = FB_BLANK_POWERDOWN;
> >>
> >> bd = backlight_device_register(dev_driver_string(par->info->device),
> >> - par->info->device, par, &bl_ops, &bl_props);
> >> + par->info->device, par, &bl_ops, &bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> dev_err(par->info->device,
> >> "cannot register backlight device (%ld)\n",
> >> diff --git a/drivers/staging/fbtft/fb_watterott.c
> >> b/drivers/staging/fbtft/fb_watterott.c
> >> index f8cb610a7b69..b24913688014 100644
> >> --- a/drivers/staging/fbtft/fb_watterott.c
> >> +++ b/drivers/staging/fbtft/fb_watterott.c
> >> @@ -259,7 +259,8 @@ static void register_chip_backlight(struct fbtft_par
> >> *par)
> >> bl_props.brightness = DEFAULT_BRIGHTNESS;
> >>
> >> bd = backlight_device_register(dev_driver_string(par->info->device),
> >> - par->info->device, par, &bl_ops, &bl_props);
> >> + par->info->device, par, &bl_ops, &bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> dev_err(par->info->device,
> >> "cannot register backlight device (%ld)\n",
> >> diff --git a/drivers/staging/fbtft/fbtft-core.c
> >> b/drivers/staging/fbtft/fbtft-core.c
> >> index 0c1a77cafe14..61c67b079b90 100644
> >> --- a/drivers/staging/fbtft/fbtft-core.c
> >> +++ b/drivers/staging/fbtft/fbtft-core.c
> >> @@ -299,7 +299,8 @@ void fbtft_register_backlight(struct fbtft_par *par)
> >> bl_props.state |= BL_CORE_DRIVER1;
> >>
> >> bd = backlight_device_register(dev_driver_string(par->info->device),
> >> - par->info->device, par, &fbtft_bl_ops,
> >> &bl_props);
> >> + par->info->device, par, &fbtft_bl_ops,
> >> &bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> dev_err(par->info->device,
> >> "cannot register backlight device (%ld)\n",
> >> diff --git a/drivers/staging/olpc_dcon/olpc_dcon.c
> >> b/drivers/staging/olpc_dcon/olpc_dcon.c
> >> index f45b2ef05f48..385c7adeaa26 100644
> >> --- a/drivers/staging/olpc_dcon/olpc_dcon.c
> >> +++ b/drivers/staging/olpc_dcon/olpc_dcon.c
> >> @@ -643,7 +643,8 @@ static int dcon_probe(struct i2c_client *client, const
> >> struct i2c_device_id *id)
> >> /* Add the backlight device for the DCON */
> >> dcon_bl_props.brightness = dcon->bl_val;
> >> dcon->bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
> >> - dcon, &dcon_bl_ops, &dcon_bl_props);
> >> + dcon, &dcon_bl_ops, &dcon_bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(dcon->bl_dev)) {
> >> dev_err(&client->dev, "cannot register backlight dev (%ld)\n",
> >> PTR_ERR(dcon->bl_dev));
> >> diff --git a/drivers/usb/misc/appledisplay.c
> >> b/drivers/usb/misc/appledisplay.c
> >> index a0a3827b4aff..97c0829711a8 100644
> >> --- a/drivers/usb/misc/appledisplay.c
> >> +++ b/drivers/usb/misc/appledisplay.c
> >> @@ -293,7 +293,8 @@ static int appledisplay_probe(struct usb_interface
> >> *iface,
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 0xff;
> >> pdata->bd = backlight_device_register(bl_name, NULL, pdata,
> >> - &appledisplay_bl_data, &props);
> >> + &appledisplay_bl_data, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(pdata->bd)) {
> >> dev_err(&iface->dev, "Backlight registration failed\n");
> >> retval = PTR_ERR(pdata->bd);
> >> diff --git a/drivers/video/backlight/88pm860x_bl.c
> >> b/drivers/video/backlight/88pm860x_bl.c
> >> index 6d8dc2c77520..e0d8212aebc0 100644
> >> --- a/drivers/video/backlight/88pm860x_bl.c
> >> +++ b/drivers/video/backlight/88pm860x_bl.c
> >> @@ -242,7 +242,8 @@ static int pm860x_backlight_probe(struct
> >> platform_device *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = MAX_BRIGHTNESS;
> >> bl = devm_backlight_device_register(&pdev->dev, name, &pdev->dev, data,
> >> - &pm860x_backlight_ops, &props);
> >> + &pm860x_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/aat2870_bl.c
> >> b/drivers/video/backlight/aat2870_bl.c
> >> index 50774e657700..a4cbc33bd6c2 100644
> >> --- a/drivers/video/backlight/aat2870_bl.c
> >> +++ b/drivers/video/backlight/aat2870_bl.c
> >> @@ -152,7 +152,8 @@ static int aat2870_bl_probe(struct platform_device
> >> *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> bd = devm_backlight_device_register(&pdev->dev, "aat2870-backlight",
> >> &pdev->dev, aat2870_bl, &aat2870_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> dev_err(&pdev->dev,
> >> "Failed allocate memory for backlight device\n");
> >> diff --git a/drivers/video/backlight/adp5520_bl.c
> >> b/drivers/video/backlight/adp5520_bl.c
> >> index dd88ba1d71ce..03093fbee414 100644
> >> --- a/drivers/video/backlight/adp5520_bl.c
> >> +++ b/drivers/video/backlight/adp5520_bl.c
> >> @@ -315,7 +315,8 @@ static int adp5520_bl_probe(struct platform_device
> >> *pdev)
> >> props.max_brightness = ADP5020_MAX_BRIGHTNESS;
> >> bl = devm_backlight_device_register(&pdev->dev, pdev->name,
> >> data->master, data, &adp5520_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/adp8860_bl.c
> >> b/drivers/video/backlight/adp8860_bl.c
> >> index 510e559c060e..88982ed257d9 100644
> >> --- a/drivers/video/backlight/adp8860_bl.c
> >> +++ b/drivers/video/backlight/adp8860_bl.c
> >> @@ -718,7 +718,8 @@ static int adp8860_probe(struct i2c_client *client,
> >>
> >> bl = devm_backlight_device_register(&client->dev,
> >> dev_driver_string(&client->dev),
> >> - &client->dev, data, &adp8860_bl_ops, &props);
> >> + &client->dev, data, &adp8860_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&client->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/adp8870_bl.c
> >> b/drivers/video/backlight/adp8870_bl.c
> >> index 21acac90fd77..5284f7f3cdd3 100644
> >> --- a/drivers/video/backlight/adp8870_bl.c
> >> +++ b/drivers/video/backlight/adp8870_bl.c
> >> @@ -894,7 +894,8 @@ static int adp8870_probe(struct i2c_client *client,
> >> props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;
> >> bl = devm_backlight_device_register(&client->dev,
> >> dev_driver_string(&client->dev),
> >> - &client->dev, data, &adp8870_bl_ops, &props);
> >> + &client->dev, data, &adp8870_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&client->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/ams369fg06.c
> >> b/drivers/video/backlight/ams369fg06.c
> >> index 5cca8ce45d4d..1bd656141c1e 100644
> >> --- a/drivers/video/backlight/ams369fg06.c
> >> +++ b/drivers/video/backlight/ams369fg06.c
> >> @@ -484,7 +484,8 @@ static int ams369fg06_probe(struct spi_device *spi)
> >>
> >> bd = devm_backlight_device_register(&spi->dev, "ams369fg06-bl",
> >> &spi->dev, lcd,
> >> - &ams369fg06_backlight_ops, &props);
> >> + &ams369fg06_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/video/backlight/apple_bl.c
> >> b/drivers/video/backlight/apple_bl.c
> >> index d84329676689..ee2e92d58512 100644
> >> --- a/drivers/video/backlight/apple_bl.c
> >> +++ b/drivers/video/backlight/apple_bl.c
> >> @@ -182,7 +182,8 @@ static int apple_bl_add(struct acpi_device *dev)
> >> props.type = BACKLIGHT_PLATFORM;
> >> props.max_brightness = 15;
> >> apple_backlight_device = backlight_device_register("apple_backlight",
> >> - NULL, NULL, &hw_data->backlight_ops, &props);
> >> + NULL, NULL, &hw_data->backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(apple_backlight_device)) {
> >> release_region(hw_data->iostart, hw_data->iolen);
> >> diff --git a/drivers/video/backlight/as3711_bl.c
> >> b/drivers/video/backlight/as3711_bl.c
> >> index 734a9158946b..5f3a40bc8a85 100644
> >> --- a/drivers/video/backlight/as3711_bl.c
> >> +++ b/drivers/video/backlight/as3711_bl.c
> >> @@ -244,7 +244,8 @@ static int as3711_bl_register(struct platform_device
> >> *pdev,
> >> su->type == AS3711_BL_SU1 ?
> >> "as3711-su1" : "as3711-su2",
> >> &pdev->dev, su,
> >> - &as3711_bl_ops, &props);
> >> + &as3711_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/backlight.c
> >> b/drivers/video/backlight/backlight.c
> >> index 288318ad21dd..1a25273576e8 100644
> >> --- a/drivers/video/backlight/backlight.c
> >> +++ b/drivers/video/backlight/backlight.c
> >> @@ -319,13 +319,15 @@ EXPORT_SYMBOL(backlight_force_update);
> >> * @devdata: an optional pointer to be stored for private driver use. The
> >> * methods may retrieve it by using bl_get_data(bd).
> >> * @ops: the backlight operations structure.
> >> + * @flags: bitmask to control backlight registration
> >> *
> >> * Creates and registers new backlight device. Returns either an
> >> * ERR_PTR() or a pointer to the newly allocated device.
> >> */
> >> struct backlight_device *backlight_device_register(const char *name,
> >> struct device *parent, void *devdata, const struct backlight_ops *ops,
> >> - const struct backlight_properties *props)
> >> + const struct backlight_properties *props,
> >> + unsigned long flags)
> >> {
> >> struct backlight_device *new_bd;
> >> int rc;
> >> @@ -363,10 +365,12 @@ struct backlight_device
> >> *backlight_device_register(const char *name,
> >> return ERR_PTR(rc);
> >> }
> >>
> >> - rc = backlight_register_fb(new_bd);
> >> - if (rc) {
> >> - device_unregister(&new_bd->dev);
> >> - return ERR_PTR(rc);
> >> + if (flags & BACKLIGHT_REGISTER_FB_CLIENT) {
> >> + rc = backlight_register_fb(new_bd);
> >> + if (rc) {
> >> + device_unregister(&new_bd->dev);
> >> + return ERR_PTR(rc);
> >> + }
> >> }
> >>
> >> new_bd->ops = ops;
> >> @@ -494,6 +498,7 @@ EXPORT_SYMBOL(backlight_unregister_notifier);
> >> * @devdata: an optional pointer to be stored for private driver use
> >> * @ops: the backlight operations structure
> >> * @props: the backlight properties
> >> + * @flags: bitmask to control backlight registration
> >> *
> >> * @return a struct backlight on success, or an ERR_PTR on error
> >> *
> >> @@ -504,7 +509,8 @@ EXPORT_SYMBOL(backlight_unregister_notifier);
> >> struct backlight_device *devm_backlight_device_register(struct device
> >> *dev,
> >> const char *name, struct device *parent, void *devdata,
> >> const struct backlight_ops *ops,
> >> - const struct backlight_properties *props)
> >> + const struct backlight_properties *props,
> >> + unsigned long flags)
> >> {
> >> struct backlight_device **ptr, *backlight;
> >>
> >> @@ -514,7 +520,7 @@ struct backlight_device
> >> *devm_backlight_device_register(struct device *dev,
> >> return ERR_PTR(-ENOMEM);
> >>
> >> backlight = backlight_device_register(name, parent, devdata, ops,
> >> - props);
> >> + props, flags);
> >> if (!IS_ERR(backlight)) {
> >> *ptr = backlight;
> >> devres_add(dev, ptr);
> >> diff --git a/drivers/video/backlight/bd6107.c
> >> b/drivers/video/backlight/bd6107.c
> >> index fdb2f7e2c6b5..a8ecd7a2f2a4 100644
> >> --- a/drivers/video/backlight/bd6107.c
> >> +++ b/drivers/video/backlight/bd6107.c
> >> @@ -163,7 +163,8 @@ static int bd6107_probe(struct i2c_client *client,
> >> backlight = devm_backlight_device_register(&client->dev,
> >> dev_name(&client->dev),
> >> &bd->client->dev, bd,
> >> - &bd6107_backlight_ops, &props);
> >> + &bd6107_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(backlight)) {
> >> dev_err(&client->dev, "failed to register backlight\n");
> >> return PTR_ERR(backlight);
> >> diff --git a/drivers/video/backlight/corgi_lcd.c
> >> b/drivers/video/backlight/corgi_lcd.c
> >> index d7c239ea3d09..006e171256a0 100644
> >> --- a/drivers/video/backlight/corgi_lcd.c
> >> +++ b/drivers/video/backlight/corgi_lcd.c
> >> @@ -562,7 +562,8 @@ static int corgi_lcd_probe(struct spi_device *spi)
> >> props.max_brightness = pdata->max_intensity;
> >> lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl",
> >> &spi->dev, lcd, &corgi_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(lcd->bl_dev))
> >> return PTR_ERR(lcd->bl_dev);
> >>
> >> diff --git a/drivers/video/backlight/cr_bllcd.c
> >> b/drivers/video/backlight/cr_bllcd.c
> >> index 3e3880fc8c8e..cf7c5d35dd63 100644
> >> --- a/drivers/video/backlight/cr_bllcd.c
> >> +++ b/drivers/video/backlight/cr_bllcd.c
> >> @@ -197,7 +197,8 @@ static int cr_backlight_probe(struct platform_device
> >> *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> bdp = devm_backlight_device_register(&pdev->dev, "cr-backlight",
> >> &pdev->dev, NULL, &cr_backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bdp)) {
> >> pci_dev_put(lpc_dev);
> >> return PTR_ERR(bdp);
> >> diff --git a/drivers/video/backlight/da903x_bl.c
> >> b/drivers/video/backlight/da903x_bl.c
> >> index f793738f06fb..d6019aebfa42 100644
> >> --- a/drivers/video/backlight/da903x_bl.c
> >> +++ b/drivers/video/backlight/da903x_bl.c
> >> @@ -146,7 +146,8 @@ static int da903x_backlight_probe(struct
> >> platform_device *pdev)
> >> props.max_brightness = max_brightness;
> >> bl = devm_backlight_device_register(&pdev->dev, pdev->name,
> >> data->da903x_dev, data,
> >> - &da903x_backlight_ops, &props);
> >> + &da903x_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/da9052_bl.c
> >> b/drivers/video/backlight/da9052_bl.c
> >> index fd2be417aa64..96738c2e8a09 100644
> >> --- a/drivers/video/backlight/da9052_bl.c
> >> +++ b/drivers/video/backlight/da9052_bl.c
> >> @@ -127,7 +127,8 @@ static int da9052_backlight_probe(struct
> >> platform_device *pdev)
> >>
> >> bl = devm_backlight_device_register(&pdev->dev, pdev->name,
> >> wleds->da9052->dev, wleds,
> >> - &da9052_backlight_ops, &props);
> >> + &da9052_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "Failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/ep93xx_bl.c
> >> b/drivers/video/backlight/ep93xx_bl.c
> >> index 0067931821c6..7fe2549969a1 100644
> >> --- a/drivers/video/backlight/ep93xx_bl.c
> >> +++ b/drivers/video/backlight/ep93xx_bl.c
> >> @@ -93,7 +93,8 @@ static int ep93xxbl_probe(struct platform_device *dev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = EP93XX_MAX_BRIGHT;
> >> bl = devm_backlight_device_register(&dev->dev, dev->name, &dev->dev,
> >> - ep93xxbl, &ep93xxbl_ops, &props);
> >> + ep93xxbl, &ep93xxbl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl))
> >> return PTR_ERR(bl);
> >>
> >> diff --git a/drivers/video/backlight/generic_bl.c
> >> b/drivers/video/backlight/generic_bl.c
> >> index 67dfb939a514..717318e12f87 100644
> >> --- a/drivers/video/backlight/generic_bl.c
> >> +++ b/drivers/video/backlight/generic_bl.c
> >> @@ -76,7 +76,8 @@ static int genericbl_probe(struct platform_device *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = machinfo->max_intensity;
> >> bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
> >> - NULL, &genericbl_ops, &props);
> >> + NULL, &genericbl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/video/backlight/gpio_backlight.c
> >> b/drivers/video/backlight/gpio_backlight.c
> >> index 18134416b154..d0b6f5155f86 100644
> >> --- a/drivers/video/backlight/gpio_backlight.c
> >> +++ b/drivers/video/backlight/gpio_backlight.c
> >> @@ -132,7 +132,8 @@ static int gpio_backlight_probe(struct platform_device
> >> *pdev)
> >> props.max_brightness = 1;
> >> bl = devm_backlight_device_register(&pdev->dev, dev_name(&pdev->dev),
> >> &pdev->dev, gbl, &gpio_backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/hp680_bl.c
> >> b/drivers/video/backlight/hp680_bl.c
> >> index 8ea42b8d9bc8..a75b2d0d489a 100644
> >> --- a/drivers/video/backlight/hp680_bl.c
> >> +++ b/drivers/video/backlight/hp680_bl.c
> >> @@ -111,7 +111,8 @@ static int hp680bl_probe(struct platform_device *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = HP680_MAX_INTENSITY;
> >> bd = devm_backlight_device_register(&pdev->dev, "hp680-bl", &pdev->dev,
> >> - NULL, &hp680bl_ops, &props);
> >> + NULL, &hp680bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/video/backlight/ipaq_micro_bl.c
> >> b/drivers/video/backlight/ipaq_micro_bl.c
> >> index 347dc11d4ceb..834ccc8a7291 100644
> >> --- a/drivers/video/backlight/ipaq_micro_bl.c
> >> +++ b/drivers/video/backlight/ipaq_micro_bl.c
> >> @@ -60,7 +60,8 @@ static int micro_backlight_probe(struct platform_device
> >> *pdev)
> >>
> >> bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight",
> >> &pdev->dev, micro, µ_bl_ops,
> >> - µ_bl_props);
> >> + µ_bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/video/backlight/jornada720_bl.c
> >> b/drivers/video/backlight/jornada720_bl.c
> >> index 7e6ff5346892..e173c5b60e9e 100644
> >> --- a/drivers/video/backlight/jornada720_bl.c
> >> +++ b/drivers/video/backlight/jornada720_bl.c
> >> @@ -118,7 +118,8 @@ static int jornada_bl_probe(struct platform_device
> >> *pdev)
> >>
> >> bd = devm_backlight_device_register(&pdev->dev, S1D_DEVICENAME,
> >> &pdev->dev, NULL, &jornada_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> ret = PTR_ERR(bd);
> >> dev_err(&pdev->dev, "failed to register device, err=%x\n", ret);
> >> diff --git a/drivers/video/backlight/kb3886_bl.c
> >> b/drivers/video/backlight/kb3886_bl.c
> >> index 84a110a719cb..eb619c4a7a39 100644
> >> --- a/drivers/video/backlight/kb3886_bl.c
> >> +++ b/drivers/video/backlight/kb3886_bl.c
> >> @@ -153,7 +153,8 @@ static int kb3886bl_probe(struct platform_device *pdev)
> >> kb3886_backlight_device = devm_backlight_device_register(&pdev->dev,
> >> "kb3886-bl", &pdev->dev,
> >> NULL, &kb3886bl_ops,
> >> - &props);
> >> + &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(kb3886_backlight_device))
> >> return PTR_ERR(kb3886_backlight_device);
> >>
> >> diff --git a/drivers/video/backlight/ld9040.c
> >> b/drivers/video/backlight/ld9040.c
> >> index 677f8abba27c..c28e91fec54f 100644
> >> --- a/drivers/video/backlight/ld9040.c
> >> +++ b/drivers/video/backlight/ld9040.c
> >> @@ -722,7 +722,8 @@ static int ld9040_probe(struct spi_device *spi)
> >> props.max_brightness = MAX_BRIGHTNESS;
> >>
> >> bd = devm_backlight_device_register(&spi->dev, "ld9040-bl", &spi->dev,
> >> - lcd, &ld9040_backlight_ops, &props);
> >> + lcd, &ld9040_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/video/backlight/lm3533_bl.c
> >> b/drivers/video/backlight/lm3533_bl.c
> >> index 0e2337f367b6..f6345a2cd076 100644
> >> --- a/drivers/video/backlight/lm3533_bl.c
> >> +++ b/drivers/video/backlight/lm3533_bl.c
> >> @@ -312,7 +312,8 @@ static int lm3533_bl_probe(struct platform_device
> >> *pdev)
> >> props.brightness = pdata->default_brightness;
> >> bd = devm_backlight_device_register(&pdev->dev, pdata->name,
> >> pdev->dev.parent, bl, &lm3533_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> dev_err(&pdev->dev, "failed to register backlight device\n");
> >> return PTR_ERR(bd);
> >> diff --git a/drivers/video/backlight/lm3630a_bl.c
> >> b/drivers/video/backlight/lm3630a_bl.c
> >> index 60d6c2ac87aa..a62a09510fe3 100644
> >> --- a/drivers/video/backlight/lm3630a_bl.c
> >> +++ b/drivers/video/backlight/lm3630a_bl.c
> >> @@ -338,7 +338,8 @@ static int lm3630a_backlight_register(struct
> >> lm3630a_chip *pchip)
> >> pchip->bleda =
> >> devm_backlight_device_register(pchip->dev, "lm3630a_leda",
> >> pchip->dev, pchip,
> >> - &lm3630a_bank_a_ops, &props);
> >> + &lm3630a_bank_a_ops, &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(pchip->bleda))
> >> return PTR_ERR(pchip->bleda);
> >> }
> >> @@ -350,7 +351,8 @@ static int lm3630a_backlight_register(struct
> >> lm3630a_chip *pchip)
> >> pchip->bledb =
> >> devm_backlight_device_register(pchip->dev, "lm3630a_ledb",
> >> pchip->dev, pchip,
> >> - &lm3630a_bank_b_ops, &props);
> >> + &lm3630a_bank_b_ops, &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(pchip->bledb))
> >> return PTR_ERR(pchip->bledb);
> >> }
> >> diff --git a/drivers/video/backlight/lm3639_bl.c
> >> b/drivers/video/backlight/lm3639_bl.c
> >> index cd50df5807ea..4aaf0c3f9eee 100644
> >> --- a/drivers/video/backlight/lm3639_bl.c
> >> +++ b/drivers/video/backlight/lm3639_bl.c
> >> @@ -349,7 +349,8 @@ static int lm3639_probe(struct i2c_client *client,
> >> pchip->bled =
> >> devm_backlight_device_register(pchip->dev, "lm3639_bled",
> >> pchip->dev, pchip, &lm3639_bled_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(pchip->bled)) {
> >> dev_err(&client->dev, "fail : backlight register\n");
> >> ret = PTR_ERR(pchip->bled);
> >> diff --git a/drivers/video/backlight/locomolcd.c
> >> b/drivers/video/backlight/locomolcd.c
> >> index 6c3ec4259a60..126a4df5fd12 100644
> >> --- a/drivers/video/backlight/locomolcd.c
> >> +++ b/drivers/video/backlight/locomolcd.c
> >> @@ -200,7 +200,8 @@ static int locomolcd_probe(struct locomo_dev *ldev)
> >> props.max_brightness = 4;
> >> locomolcd_bl_device = backlight_device_register("locomo-bl",
> >> &ldev->dev, NULL,
> >> - &locomobl_data, &props);
> >> + &locomobl_data, &props,
> >> +
> >> BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(locomolcd_bl_device))
> >> return PTR_ERR(locomolcd_bl_device);
> >> diff --git a/drivers/video/backlight/lp855x_bl.c
> >> b/drivers/video/backlight/lp855x_bl.c
> >> index e5b14f52628f..6ef51c6540a6 100644
> >> --- a/drivers/video/backlight/lp855x_bl.c
> >> +++ b/drivers/video/backlight/lp855x_bl.c
> >> @@ -299,7 +299,8 @@ static int lp855x_backlight_register(struct lp855x *lp)
> >> props.brightness = pdata->initial_brightness;
> >>
> >> bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,
> >> - &lp855x_bl_ops, &props);
> >> + &lp855x_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl))
> >> return PTR_ERR(bl);
> >>
> >> diff --git a/drivers/video/backlight/lp8788_bl.c
> >> b/drivers/video/backlight/lp8788_bl.c
> >> index cf869ec90cce..734677bef739 100644
> >> --- a/drivers/video/backlight/lp8788_bl.c
> >> +++ b/drivers/video/backlight/lp8788_bl.c
> >> @@ -214,7 +214,8 @@ static int lp8788_backlight_register(struct lp8788_bl
> >> *bl)
> >> name = pdata->name;
> >>
> >> bl_dev = backlight_device_register(name, bl->lp->dev, bl,
> >> - &lp8788_bl_ops, &props);
> >> + &lp8788_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl_dev))
> >> return PTR_ERR(bl_dev);
> >>
> >> diff --git a/drivers/video/backlight/lv5207lp.c
> >> b/drivers/video/backlight/lv5207lp.c
> >> index 8ab7297b118a..ebd41edcd936 100644
> >> --- a/drivers/video/backlight/lv5207lp.c
> >> +++ b/drivers/video/backlight/lv5207lp.c
> >> @@ -120,7 +120,8 @@ static int lv5207lp_probe(struct i2c_client *client,
> >>
> >> backlight = devm_backlight_device_register(&client->dev,
> >> dev_name(&client->dev), &lv->client->dev,
> >> - lv, &lv5207lp_backlight_ops, &props);
> >> + lv, &lv5207lp_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(backlight)) {
> >> dev_err(&client->dev, "failed to register backlight\n");
> >> return PTR_ERR(backlight);
> >> diff --git a/drivers/video/backlight/max8925_bl.c
> >> b/drivers/video/backlight/max8925_bl.c
> >> index 7b738d60ecc2..aa1d39ab9977 100644
> >> --- a/drivers/video/backlight/max8925_bl.c
> >> +++ b/drivers/video/backlight/max8925_bl.c
> >> @@ -165,7 +165,8 @@ static int max8925_backlight_probe(struct
> >> platform_device *pdev)
> >> props.max_brightness = MAX_BRIGHTNESS;
> >> bl = devm_backlight_device_register(&pdev->dev, "max8925-backlight",
> >> &pdev->dev, data,
> >> - &max8925_backlight_ops, &props);
> >> + &max8925_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/omap1_bl.c
> >> b/drivers/video/backlight/omap1_bl.c
> >> index 546d94df21d5..c587a4ec89a2 100644
> >> --- a/drivers/video/backlight/omap1_bl.c
> >> +++ b/drivers/video/backlight/omap1_bl.c
> >> @@ -148,7 +148,8 @@ static int omapbl_probe(struct platform_device *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = OMAPBL_MAX_INTENSITY;
> >> dev = devm_backlight_device_register(&pdev->dev, "omap-bl", &pdev->dev,
> >> - bl, &omapbl_ops, &props);
> >> + bl, &omapbl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(dev))
> >> return PTR_ERR(dev);
> >>
> >> diff --git a/drivers/video/backlight/ot200_bl.c
> >> b/drivers/video/backlight/ot200_bl.c
> >> index 3acdb9f646ed..36d71b32b9cd 100644
> >> --- a/drivers/video/backlight/ot200_bl.c
> >> +++ b/drivers/video/backlight/ot200_bl.c
> >> @@ -120,7 +120,8 @@ static int ot200_backlight_probe(struct
> >> platform_device *pdev)
> >>
> >> bl = devm_backlight_device_register(&pdev->dev, dev_name(&pdev->dev),
> >> &pdev->dev, data, &ot200_backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> retval = PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/pandora_bl.c
> >> b/drivers/video/backlight/pandora_bl.c
> >> index 5d8bb8b20183..b654543ea895 100644
> >> --- a/drivers/video/backlight/pandora_bl.c
> >> +++ b/drivers/video/backlight/pandora_bl.c
> >> @@ -115,7 +115,8 @@ static int pandora_backlight_probe(struct
> >> platform_device *pdev)
> >> props.max_brightness = MAX_USER_VALUE;
> >> props.type = BACKLIGHT_RAW;
> >> bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev,
> >> - NULL, &pandora_backlight_ops, &props);
> >> + NULL, &pandora_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/pcf50633-backlight.c
> >> b/drivers/video/backlight/pcf50633-backlight.c
> >> index 85bd573b6d15..8f3dd6b22088 100644
> >> --- a/drivers/video/backlight/pcf50633-backlight.c
> >> +++ b/drivers/video/backlight/pcf50633-backlight.c
> >> @@ -129,7 +129,8 @@ static int pcf50633_bl_probe(struct platform_device
> >> *pdev)
> >>
> >> pcf_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
> >> &pdev->dev, pcf_bl,
> >> - &pcf50633_bl_ops, &bl_props);
> >> + &pcf50633_bl_ops, &bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> if (IS_ERR(pcf_bl->bl))
> >> return PTR_ERR(pcf_bl->bl);
> >> diff --git a/drivers/video/backlight/pm8941-wled.c
> >> b/drivers/video/backlight/pm8941-wled.c
> >> index 0b6d21955d91..85035f2f784f 100644
> >> --- a/drivers/video/backlight/pm8941-wled.c
> >> +++ b/drivers/video/backlight/pm8941-wled.c
> >> @@ -408,7 +408,8 @@ static int pm8941_wled_probe(struct platform_device
> >> *pdev)
> >> props.max_brightness = PM8941_WLED_REG_VAL_MAX;
> >> bl = devm_backlight_device_register(&pdev->dev, wled->name,
> >> &pdev->dev, wled,
> >> - &pm8941_wled_ops, &props);
> >> + &pm8941_wled_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> return PTR_ERR_OR_ZERO(bl);
> >> };
> >>
> >> diff --git a/drivers/video/backlight/pwm_bl.c
> >> b/drivers/video/backlight/pwm_bl.c
> >> index b2b366bb0f97..98655fce462c 100644
> >> --- a/drivers/video/backlight/pwm_bl.c
> >> +++ b/drivers/video/backlight/pwm_bl.c
> >> @@ -330,7 +330,8 @@ static int pwm_backlight_probe(struct platform_device
> >> *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = data->max_brightness;
> >> bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, pb,
> >> - &pwm_backlight_ops, &props);
> >> + &pwm_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> ret = PTR_ERR(bl);
> >> diff --git a/drivers/video/backlight/s6e63m0.c
> >> b/drivers/video/backlight/s6e63m0.c
> >> index 3c4a22a3063a..60bc88075e68 100644
> >> --- a/drivers/video/backlight/s6e63m0.c
> >> +++ b/drivers/video/backlight/s6e63m0.c
> >> @@ -748,7 +748,8 @@ static int s6e63m0_probe(struct spi_device *spi)
> >>
> >> bd = devm_backlight_device_register(&spi->dev, "s6e63m0bl-bl",
> >> &spi->dev, lcd, &s6e63m0_backlight_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd))
> >> return PTR_ERR(bd);
> >>
> >> diff --git a/drivers/video/backlight/sky81452-backlight.c
> >> b/drivers/video/backlight/sky81452-backlight.c
> >> index d414c7a3acf5..9abdbcf71fef 100644
> >> --- a/drivers/video/backlight/sky81452-backlight.c
> >> +++ b/drivers/video/backlight/sky81452-backlight.c
> >> @@ -294,7 +294,8 @@ static int sky81452_bl_probe(struct platform_device
> >> *pdev)
> >> props.max_brightness = SKY81452_MAX_BRIGHTNESS,
> >> name = pdata->name ? pdata->name : SKY81452_DEFAULT_NAME;
> >> bd = devm_backlight_device_register(dev, name, dev, regmap,
> >> - &sky81452_bl_ops, &props);
> >> + &sky81452_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(bd));
> >> return PTR_ERR(bd);
> >> diff --git a/drivers/video/backlight/tosa_bl.c
> >> b/drivers/video/backlight/tosa_bl.c
> >> index 83742d806391..755a61727ca1 100644
> >> --- a/drivers/video/backlight/tosa_bl.c
> >> +++ b/drivers/video/backlight/tosa_bl.c
> >> @@ -107,7 +107,8 @@ static int tosa_bl_probe(struct i2c_client *client,
> >> props.max_brightness = 512 - 1;
> >> data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
> >> &client->dev, data, &bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(data->bl)) {
> >> ret = PTR_ERR(data->bl);
> >> goto err_reg;
> >> diff --git a/drivers/video/backlight/tps65217_bl.c
> >> b/drivers/video/backlight/tps65217_bl.c
> >> index fd524ad860a5..0ac55b9a773c 100644
> >> --- a/drivers/video/backlight/tps65217_bl.c
> >> +++ b/drivers/video/backlight/tps65217_bl.c
> >> @@ -306,7 +306,8 @@ static int tps65217_bl_probe(struct platform_device
> >> *pdev)
> >>
> >> tps65217_bl->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
> >> tps65217_bl->dev, tps65217_bl,
> >> - &tps65217_bl_ops, &bl_props);
> >> + &tps65217_bl_ops, &bl_props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(tps65217_bl->bl)) {
> >> dev_err(tps65217_bl->dev,
> >> "registration of backlight device failed: %d\n", rc);
> >> diff --git a/drivers/video/backlight/wm831x_bl.c
> >> b/drivers/video/backlight/wm831x_bl.c
> >> index 6eab0d6c262a..8b92a277f83b 100644
> >> --- a/drivers/video/backlight/wm831x_bl.c
> >> +++ b/drivers/video/backlight/wm831x_bl.c
> >> @@ -197,7 +197,8 @@ static int wm831x_backlight_probe(struct
> >> platform_device *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = max_isel;
> >> bl = devm_backlight_device_register(&pdev->dev, "wm831x", &pdev->dev,
> >> - data, &wm831x_backlight_ops, &props);
> >> + data, &wm831x_backlight_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&pdev->dev, "failed to register backlight\n");
> >> return PTR_ERR(bl);
> >> diff --git a/drivers/video/fbdev/atmel_lcdfb.c
> >> b/drivers/video/fbdev/atmel_lcdfb.c
> >> index 669ecc755fa9..d6c46d670622 100644
> >> --- a/drivers/video/fbdev/atmel_lcdfb.c
> >> +++ b/drivers/video/fbdev/atmel_lcdfb.c
> >> @@ -244,7 +244,8 @@ static void init_backlight(struct atmel_lcdfb_info
> >> *sinfo)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 0xff;
> >> bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
> >> - &atmel_lcdc_bl_ops, &props);
> >> + &atmel_lcdc_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
> >> PTR_ERR(bl));
> >> diff --git a/drivers/video/fbdev/aty/aty128fb.c
> >> b/drivers/video/fbdev/aty/aty128fb.c
> >> index 0a4626886b00..dae8734870c9 100644
> >> --- a/drivers/video/fbdev/aty/aty128fb.c
> >> +++ b/drivers/video/fbdev/aty/aty128fb.c
> >> @@ -1871,7 +1871,8 @@ static void aty128_bl_init(struct aty128fb_par *par)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
> >> bd = backlight_device_register(name, info->dev, par, &aty128_bl_data,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> info->bl_dev = NULL;
> >> printk(KERN_WARNING "aty128: Backlight registration failed\n");
> >> diff --git a/drivers/video/fbdev/aty/atyfb_base.c
> >> b/drivers/video/fbdev/aty/atyfb_base.c
> >> index f34ed47fcaf8..918ec8f946aa 100644
> >> --- a/drivers/video/fbdev/aty/atyfb_base.c
> >> +++ b/drivers/video/fbdev/aty/atyfb_base.c
> >> @@ -2242,7 +2242,8 @@ static void aty_bl_init(struct atyfb_par *par)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
> >> bd = backlight_device_register(name, info->dev, par, &aty_bl_data,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> info->bl_dev = NULL;
> >> printk(KERN_WARNING "aty: Backlight registration failed\n");
> >> diff --git a/drivers/video/fbdev/aty/radeon_backlight.c
> >> b/drivers/video/fbdev/aty/radeon_backlight.c
> >> index 301d6d6aeead..a8c9ef618e42 100644
> >> --- a/drivers/video/fbdev/aty/radeon_backlight.c
> >> +++ b/drivers/video/fbdev/aty/radeon_backlight.c
> >> @@ -155,7 +155,8 @@ void radeonfb_bl_init(struct radeonfb_info *rinfo)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
> >> bd = backlight_device_register(name, rinfo->info->dev, pdata,
> >> - &radeon_bl_data, &props);
> >> + &radeon_bl_data, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> rinfo->info->bl_dev = NULL;
> >> printk("radeonfb: Backlight registration failed\n");
> >> diff --git a/drivers/video/fbdev/bf537-lq035.c
> >> b/drivers/video/fbdev/bf537-lq035.c
> >> index ef29fb425122..77b6f98d2182 100644
> >> --- a/drivers/video/fbdev/bf537-lq035.c
> >> +++ b/drivers/video/fbdev/bf537-lq035.c
> >> @@ -765,7 +765,8 @@ static int bfin_lq035_probe(struct platform_device
> >> *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = MAX_BRIGHENESS;
> >> bl_dev = backlight_device_register("bf537-bl", NULL, NULL,
> >> - &bfin_lq035fb_bl_ops, &props);
> >> + &bfin_lq035fb_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >>
> >> lcd_dev = lcd_device_register(KBUILD_MODNAME, &pdev->dev, NULL,
> >> &bfin_lcd_ops);
> >> diff --git a/drivers/video/fbdev/bf54x-lq043fb.c
> >> b/drivers/video/fbdev/bf54x-lq043fb.c
> >> index 8f1f97c75619..4001f3c9c40c 100644
> >> --- a/drivers/video/fbdev/bf54x-lq043fb.c
> >> +++ b/drivers/video/fbdev/bf54x-lq043fb.c
> >> @@ -652,7 +652,8 @@ static int bfin_bf54x_probe(struct platform_device
> >> *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 255;
> >> bl_dev = backlight_device_register("bf54x-bl", NULL, NULL,
> >> - &bfin_lq043fb_bl_ops, &props);
> >> + &bfin_lq043fb_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl_dev)) {
> >> printk(KERN_ERR DRIVER_NAME
> >> ": unable to register backlight.\n");
> >> diff --git a/drivers/video/fbdev/bfin-t350mcqb-fb.c
> >> b/drivers/video/fbdev/bfin-t350mcqb-fb.c
> >> index e5ee4d9677f7..6c1c64f48432 100644
> >> --- a/drivers/video/fbdev/bfin-t350mcqb-fb.c
> >> +++ b/drivers/video/fbdev/bfin-t350mcqb-fb.c
> >> @@ -549,7 +549,8 @@ static int bfin_t350mcqb_probe(struct platform_device
> >> *pdev)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = 255;
> >> bl_dev = backlight_device_register("bf52x-bl", NULL, NULL,
> >> - &bfin_lq043fb_bl_ops, &props);
> >> + &bfin_lq043fb_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl_dev)) {
> >> printk(KERN_ERR DRIVER_NAME
> >> ": unable to register backlight.\n");
> >> diff --git a/drivers/video/fbdev/exynos/s6e8ax0.c
> >> b/drivers/video/fbdev/exynos/s6e8ax0.c
> >> index de2f3e793786..a78c6effab97 100644
> >> --- a/drivers/video/fbdev/exynos/s6e8ax0.c
> >> +++ b/drivers/video/fbdev/exynos/s6e8ax0.c
> >> @@ -796,7 +796,8 @@ static int s6e8ax0_probe(struct mipi_dsim_lcd_device
> >> *dsim_dev)
> >> }
> >>
> >> lcd->bd = devm_backlight_device_register(lcd->dev, "s6e8ax0-bl",
> >> - lcd->dev, lcd, &s6e8ax0_backlight_ops, NULL);
> >> + lcd->dev, lcd, &s6e8ax0_backlight_ops, NULL,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(lcd->bd)) {
> >> dev_err(lcd->dev, "failed to register backlight ops.\n");
> >> return PTR_ERR(lcd->bd);
> >> diff --git a/drivers/video/fbdev/mx3fb.c b/drivers/video/fbdev/mx3fb.c
> >> index f91b1db262b0..c13c365e6622 100644
> >> --- a/drivers/video/fbdev/mx3fb.c
> >> +++ b/drivers/video/fbdev/mx3fb.c
> >> @@ -319,7 +319,8 @@ static void mx3fb_init_backlight(struct mx3fb_data
> >> *fbd)
> >> sdc_set_brightness(fbd, fbd->backlight_level);
> >>
> >> bl = backlight_device_register("mx3fb-bl", fbd->dev, fbd,
> >> - &mx3fb_lcdc_bl_ops, &props);
> >> + &mx3fb_lcdc_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(fbd->dev, "error %ld on backlight register\n",
> >> PTR_ERR(bl));
> >> diff --git a/drivers/video/fbdev/nvidia/nv_backlight.c
> >> b/drivers/video/fbdev/nvidia/nv_backlight.c
> >> index 5c151b2ea683..fdb91547b02f 100644
> >> --- a/drivers/video/fbdev/nvidia/nv_backlight.c
> >> +++ b/drivers/video/fbdev/nvidia/nv_backlight.c
> >> @@ -108,7 +108,8 @@ void nvidia_bl_init(struct nvidia_par *par)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
> >> bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> info->bl_dev = NULL;
> >> printk(KERN_WARNING "nvidia: Backlight registration failed\n");
> >> diff --git a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
> >> b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
> >> index b58012b82b6f..2c5fccf81391 100644
> >> --- a/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
> >> +++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.c
> >> @@ -1259,7 +1259,8 @@ static int dsicm_probe(struct platform_device *pdev)
> >>
> >> props.type = BACKLIGHT_RAW;
> >> bldev = backlight_device_register(dev_name(dev),
> >> - dev, ddata, &dsicm_bl_ops, &props);
> >> + dev, ddata, &dsicm_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bldev)) {
> >> r = PTR_ERR(bldev);
> >> goto err_bl;
> >> diff --git
> >> a/drivers/video/fbdev/omap2/omapfb/displays/panel-sony-acx565akm.c
> >> b/drivers/video/fbdev/omap2/omapfb/displays/panel-sony-acx565akm.c
> >> index 468560a6daae..8d7821e8bb0a 100644
> >> --- a/drivers/video/fbdev/omap2/omapfb/displays/panel-sony-acx565akm.c
> >> +++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-sony-acx565akm.c
> >> @@ -816,7 +816,8 @@ static int acx565akm_probe(struct spi_device *spi)
> >> props.type = BACKLIGHT_RAW;
> >>
> >> bldev = backlight_device_register("acx565akm", &ddata->spi->dev,
> >> - ddata, &acx565akm_bl_ops, &props);
> >> + ddata, &acx565akm_bl_ops, &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bldev)) {
> >> r = PTR_ERR(bldev);
> >> goto err_reg_bl;
> >> diff --git a/drivers/video/fbdev/riva/fbdev.c
> >> b/drivers/video/fbdev/riva/fbdev.c
> >> index 2ef26ad99341..6dc05da50609 100644
> >> --- a/drivers/video/fbdev/riva/fbdev.c
> >> +++ b/drivers/video/fbdev/riva/fbdev.c
> >> @@ -343,7 +343,8 @@ static void riva_bl_init(struct riva_par *par)
> >> props.type = BACKLIGHT_RAW;
> >> props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
> >> bd = backlight_device_register(name, info->dev, par, &riva_bl_ops,
> >> - &props);
> >> + &props,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bd)) {
> >> info->bl_dev = NULL;
> >> printk(KERN_WARNING "riva: Backlight registration failed\n");
> >> diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> >> b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> >> index 82c0a8caa9b8..2000ed98b380 100644
> >> --- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> >> +++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> >> @@ -2314,7 +2314,8 @@ static struct backlight_device
> >> *sh_mobile_lcdc_bl_probe(struct device *parent,
> >> struct backlight_device *bl;
> >>
> >> bl = backlight_device_register(ch->cfg->bl_info.name, parent, ch,
> >> - &sh_mobile_lcdc_bl_ops, NULL);
> >> + &sh_mobile_lcdc_bl_ops, NULL,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> dev_err(parent, "unable to register backlight device: %ld\n",
> >> PTR_ERR(bl));
> >> diff --git a/drivers/video/fbdev/ssd1307fb.c
> >> b/drivers/video/fbdev/ssd1307fb.c
> >> index a9c45c89b15e..a8a7ba4acde6 100644
> >> --- a/drivers/video/fbdev/ssd1307fb.c
> >> +++ b/drivers/video/fbdev/ssd1307fb.c
> >> @@ -673,7 +673,8 @@ static int ssd1307fb_probe(struct i2c_client *client,
> >>
> >> snprintf(bl_name, sizeof(bl_name), "ssd1307fb%d", info->node);
> >> bl = backlight_device_register(bl_name, &client->dev, par,
> >> - &ssd1307fb_bl_ops, NULL);
> >> + &ssd1307fb_bl_ops, NULL,
> >> + BACKLIGHT_REGISTER_FB_CLIENT);
> >> if (IS_ERR(bl)) {
> >> ret = PTR_ERR(bl);
> >> dev_err(&client->dev, "unable to register backlight device:
> >> %d\n",
> >> diff --git a/include/linux/backlight.h b/include/linux/backlight.h
> >> index 5f2fd61ef4fb..79af3ccabeca 100644
> >> --- a/include/linux/backlight.h
> >> +++ b/include/linux/backlight.h
> >> @@ -129,13 +129,16 @@ static inline int backlight_update_status(struct
> >> backlight_device *bd)
> >> return ret;
> >> }
> >>
> >> +#define BACKLIGHT_REGISTER_FB_CLIENT 0x1
> >> extern struct backlight_device *backlight_device_register(const char
> >> *name,
> >> struct device *dev, void *devdata, const struct backlight_ops *ops,
> >> - const struct backlight_properties *props);
> >> + const struct backlight_properties *props,
> >> + unsigned long flags);
> >> extern struct backlight_device *devm_backlight_device_register(
> >> struct device *dev, const char *name, struct device *parent,
> >> void *devdata, const struct backlight_ops *ops,
> >> - const struct backlight_properties *props);
> >> + const struct backlight_properties *props,
> >> + unsigned long flags);
> >> extern void backlight_device_unregister(struct backlight_device *bd);
> >> extern void devm_backlight_device_unregister(struct device *dev,
> >> struct backlight_device *bd);
> >> --
> >> 2.8.1
> >>
> >> _______________________________________________
> >> Intel-gfx mailing list
> >> Intel-gfx at lists.freedesktop.org
> >> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Jani Nikula, Intel Open Source Technology Center
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
