Thanks for catching this. BR, Souvik
> -----Original Message----- > From: platform-driver-x86-ow...@vger.kernel.org [mailto:platform-driver- > x86-ow...@vger.kernel.org] On Behalf Of priyalee.kushw...@intel.com > Sent: Saturday, May 27, 2017 8:48 PM > To: dvh...@infradead.org; Chakravarty, Souvik K > <souvik.k.chakrava...@intel.com>; a...@infradead.org > Cc: linux-kernel@vger.kernel.org; platform-driver-...@vger.kernel.org; > Kushwaha, Priyalee <priyalee.kushw...@intel.com> > Subject: [PATCH v1 1/1] intel_telemetry_debugfs: fix oops found while > load/unload module test > > From: Priyalee Kushwaha <priyalee.kushw...@intel.com> > > This fix oops found while testing load/unload test of > intel_telemetry_debugfs module. Module_init uses register_pm_notifier > for PM callbacks, but unregister_pm_notifier was missing from > module_exit. > > [ 97.481860] BUG: unable to handle kernel paging request at > ffffffffa006f010 [ 97.489742] IP: > blocking_notifier_chain_register+0x3a/0xa0 > [ 97.495898] PGD 2e0a067 > [ 97.495899] PUD 2e0b063 > [ 97.498737] PMD 179e29067 > [ 97.501573] PTE 0 > > [ 97.508423] Oops: 0000 1 PREEMPT SMP > [ 97.512724] Modules linked in: intel_telemetry_debugfs intel_rapl > gpio_keys dwc3 udc_core intel_telemetry_pltdrv intel_punit_ipc > intel_telemetry_core rtc_cmos efivars x86_pkg_temp_thermal iwlwifi > snd_hda_codec_hdmi soc_button_array btusb cfg80211 btrtl mei_me > hci_uart btbcm mei btintel i915 bluetooth intel_pmc_ipc snd_hda_intel > spi_pxa2xx_platform snd_hda_codec dwc3_pci snd_hda_core tpm_tis > tpm_tis_core tpm efivarfs [ 97.558453] CPU: 0 PID: 889 Comm: modprobe > Not tainted 4.11.0-rc6-intel-dev-bkc #1 [ 97.566950] Hardware name: Intel > Corp. Joule DVT3/SDS, BIOS GTPP181A.X64.0143.B30.1701132137 > 01/13/2017 [ 97.577518] task: ffff8801793a21c0 task.stack: > ffff8801793f0000 [ 97.584162] RIP: > 0010:blocking_notifier_chain_register+0x3a/0xa0 > [ 97.590903] RSP: 0018:ffff8801793f3c58 EFLAGS: 00010286 [ > 97.596802] RAX: ffffffffa006f000 RBX: ffffffff81e3ea20 RCX: > 0000000000000000 [ 97.604812] RDX: ffff880179eaf210 RSI: > ffffffffa0131000 RDI: ffffffff81e3ea20 [ 97.612821] RBP: ffff8801793f3c68 > R08: 0000000000000006 R09: 000000000000005c [ 97.620847] R10: > 0000000000000000 R11: 0000000000000006 R12: ffffffffa0131000 [ > 97.628855] R13: 0000000000000000 R14: ffff880176e35f48 R15: > ffff8801793f3ea8 [ 97.636865] FS: 00007f7eeba07700(0000) > GS:ffff88017fc00000(0000) knlGS:0000000000000000 [ 97.645948] CS: > 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 97.652423] CR2: > ffffffffa006f010 CR3: 00000001775ef000 CR4: 00000000003406f0 [ > 97.660423] Call Trace: > [ 97.663166] ? 0xffffffffa0031000 > [ 97.666885] register_pm_notifier+0x18/0x20 [ 97.671581] > telemetry_debugfs_init+0x92/0x1000 > > Signed-off-by: Priyalee Kushwaha <priyalee.kushw...@intel.com> > --- > drivers/platform/x86/intel_telemetry_debugfs.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/platform/x86/intel_telemetry_debugfs.c > b/drivers/platform/x86/intel_telemetry_debugfs.c > index ef29f18..0f93975 100644 > --- a/drivers/platform/x86/intel_telemetry_debugfs.c > +++ b/drivers/platform/x86/intel_telemetry_debugfs.c > @@ -966,8 +966,12 @@ static int __init telemetry_debugfs_init(void) > #endif /* CONFIG_PM_SLEEP */ > > debugfs_conf->telemetry_dbg_dir = > debugfs_create_dir("telemetry", NULL); > - if (!debugfs_conf->telemetry_dbg_dir) > + if (!debugfs_conf->telemetry_dbg_dir) { #ifdef CONFIG_PM_SLEEP > + unregister_pm_notifier(&pm_notifier); > +#endif /* CONFIG_PM_SLEEP */ > return -ENOMEM; > + } > > f = debugfs_create_file("pss_info", S_IFREG | S_IRUGO, > debugfs_conf->telemetry_dbg_dir, NULL, > @@ -1014,6 +1018,9 @@ static int __init telemetry_debugfs_init(void) > out: > debugfs_remove_recursive(debugfs_conf->telemetry_dbg_dir); > debugfs_conf->telemetry_dbg_dir = NULL; > +#ifdef CONFIG_PM_SLEEP > + unregister_pm_notifier(&pm_notifier); > +#endif /* CONFIG_PM_SLEEP */ > > return err; > } > @@ -1022,6 +1029,9 @@ static void __exit telemetry_debugfs_exit(void) > { > debugfs_remove_recursive(debugfs_conf->telemetry_dbg_dir); > debugfs_conf->telemetry_dbg_dir = NULL; > +#ifdef CONFIG_PM_SLEEP > + unregister_pm_notifier(&pm_notifier); > +#endif /* CONFIG_PM_SLEEP */ > } > > late_initcall(telemetry_debugfs_init); > -- > 2.10.0
