Am 04.03.2015 um 16:31 schrieb Alan Stern:
check to see what those values actually were. It's easy enough to fix
up, though; revised patch below.
Thanks, in contrast to the patch from Al Viro that one applies.
I wonder if the patches in the (vfs-)tree he has used as base might fix
some more problems of gadgetfs I've discovered since I can use it.
In detail it's only usable once (3.19). When unmounting it throws one or
two warnings because of too much puts (kernel/module.c:963, see below).
The result is that a subsequent mount afterwards fails because the old
instance is still busy (Resource temporarily unavailable).
I haven't looked deeper into that problem up to now.
Regards,
Alexander Holler
[ 151.425966] gadgetfs: USB Gadget filesystem, version 24 Aug 2004
[ 151.479616] gadgetfs: bound to musb-hdrc driver
[ 151.781095] gadgetfs: connected
[ 151.785871] gadgetfs: disconnected
[ 151.864187] gadgetfs: connected
[ 151.873258] gadgetfs: configuration #1
[ 151.962240] musb_g_ep0_irq 804: SETUP packet len 0 != 8 ?
[ 155.065272] input: USB Keyboard as
/devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb2/2-1/2-1:1.0/0003:04D9:1603.0003/input/input2
[ 155.119746] hid-generic 0003:04D9:1603.0003: input,hidraw0: USB HID
v1.10 Keyboard [ USB Keyboard] on usb-musb-hdrc.1.auto-1/input0
[ 155.138194] input: USB Keyboard as
/devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1.auto/usb2/2-1/2-1:1.1/0003:04D9:1603.0004/input/input3
[ 155.189783] hid-generic 0003:04D9:1603.0004: input,hidraw1: USB HID
v1.10 Device [ USB Keyboard] on usb-musb-hdrc.1.auto-1/input1
[ 155.190002] gadgetfs: disconnected
[ 155.190352] ------------[ cut here ]------------
[ 155.190389] WARNING: CPU: 0 PID: 1290 at kernel/module.c:963
module_put+0x54/0x5c()
[ 155.190396] Modules linked in: gadgetfs usb_f_ecm usb_f_rndis u_ether
libcomposite configfs ipv6 bnep bluetooth rfkill hid_generic tda998x
tilcdc drm_kms_helper ti_cpsw ptp drm usbhid pps_core davinci_cpdma
omap_mailbox cppi41 [last unloaded: g_ether]
[ 155.190459] CPU: 0 PID: 1290 Comm: usb-mitm Not tainted
3.19.0-bbb-00080-g5e25c2a #246
[ 155.190466] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 155.190505] [<c00126f0>] (unwind_backtrace) from [<c00108d8>]
(show_stack+0x10/0x14)
[ 155.190527] [<c00108d8>] (show_stack) from [<c002ef74>]
(warn_slowpath_common+0x80/0xa8)
[ 155.190542] [<c002ef74>] (warn_slowpath_common) from [<c002f02c>]
(warn_slowpath_null+0x18/0x20)
[ 155.190556] [<c002f02c>] (warn_slowpath_null) from [<c0069afc>]
(module_put+0x54/0x5c)
[ 155.190581] [<c0069afc>] (module_put) from [<c00c3be0>]
(deactivate_locked_super+0x4c/0x64)
[ 155.190598] [<c00c3be0>] (deactivate_locked_super) from [<c00d8d88>]
(cleanup_mnt+0x4c/0x6c)
[ 155.190614] [<c00d8d88>] (cleanup_mnt) from [<c0041908>]
(task_work_run+0x8c/0xa4)
[ 155.190628] [<c0041908>] (task_work_run) from [<c001059c>]
(do_work_pending+0x98/0xac)
[ 155.190642] [<c001059c>] (do_work_pending) from [<c000dc04>]
(work_pending+0xc/0x20)
[ 155.190649] ---[ end trace c3d57fca714062a3 ]---
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