Re: [RFC PATCH] media: uvc: *HACK* workaround uvc unregister device

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Hi Laurent,

this was probably one hack comment to much,
so it did not get much attention. :)

It is possible that this patch is not fully a workaround. But I am not
aware how much this could break along the way.

Thanks,
Michael

On Thu, Oct 02, 2014 at 06:09:47PM +0200, Michael Grzeschik wrote:
> Currently the uvc_driver is not cleaning up its child devices if a
> device is still in use. It leads to orphaned devices which are not
> sitting on any interface. They get cleaned up on uvc_delete which will
> be called on uvc_remove after the userspace application is closing the
> stream. When PM_RUNTIME is used in the kernel, this leads to the
> following backtrace for missing sysfs entries in the orphaned kobjects.
> 
> This patch is moving the device cleanup code for the child devices from
> uvc_delete to uvc_unregister_video. It is an *HACK* workaround which
> is ment to initiate the discussion for a proper solution.
> 
> This behaviour can simply be reproduced by the following command:
> 
> $ gst-launch v4l2src device=/dev/video0 ! fakesink
> 
> -> Now disconnect the UVC Camera while the stream is still open and used
> 
> $ <Ctrl-C> # to close the running gstreamer pipeline
> 
> [  258.012048] ------------[ cut here ]------------
> [  258.021206] WARNING: CPU: 0 PID: 280 at fs/sysfs/group.c:220 sysfs_remove_group+0xb4/0xb8()
> [  258.031728] sysfs group 80c79200 not found for kobject 'event0'
> [  258.039383] Modules linked in: lock(O) usb_f_ecm g_ether usb_f_rndis u_ether libcomposite coda ath6kl_sdio ath6kl_core
> [  258.051098] CPU: 0 PID: 280 Comm: v4l2filter0:src Tainted: G           O   3.17.0-rc6-20140925-1+ #10
> [  258.063318] Backtrace:
> [  258.066403] [<80012ca4>] (dump_backtrace) from [<80012f94>] (show_stack+0x18/0x1c)
> [  258.077579]  r6:000000dc r5:00000009 r4:d81f7ba8 r3:00000000
> [  258.084549] [<80012f7c>] (show_stack) from [<807872e4>] (dump_stack+0x24/0x28)
> [  258.091791] [<807872c0>] (dump_stack) from [<80025140>] (warn_slowpath_common+0x78/0x90)
> [  258.100770] [<800250c8>] (warn_slowpath_common) from [<80025190>] (warn_slowpath_fmt+0x38/0x40)
> [  258.109818]  r8:00000000 r7:da00a218 r6:da0520f0 r5:00000000 r4:80c79200
> [  258.116675] [<8002515c>] (warn_slowpath_fmt) from [<8015bb4c>] (sysfs_remove_group+0xb4/0xb8)
> [  258.125824]  r3:80c79200 r2:8098e22c
> [  258.129463] [<8015ba98>] (sysfs_remove_group) from [<803ec5a4>] (dpm_sysfs_remove+0x54/0x58)
> [  258.138500]  r6:da0520e8 r5:da0520f0 r4:80c79200
> [  258.143195] [<803ec550>] (dpm_sysfs_remove) from [<803e3664>] (device_del+0x4c/0x1b0)
> [  258.151790]  r6:da052004 r5:da0520e8 r4:da052000 r3:da306200
> [  258.157813] [<803e3618>] (device_del) from [<804eb7a8>] (evdev_disconnect+0x20/0x48)
> [  258.166190]  r7:da00a1b4 r6:da052004 r5:da0520e8 r4:da052000
> [  258.172637] [<804eb788>] (evdev_disconnect) from [<804e694c>] (__input_unregister_device+0xb0/0x150)
> [  258.182282]  r6:da00a000 r5:da00a448 r4:da00a434 r3:804eb788
> [  258.188064] [<804e689c>] (__input_unregister_device) from [<804e7b50>] (input_unregister_device+0x50/0x78)
> [  258.198271]  r7:da051c00 r6:da009000 r5:81506254 r4:da00a000
> [  258.204013] [<804e7b00>] (input_unregister_device) from [<8052eba8>] (uvc_status_cleanup+0x38/0x3c)
> [  258.213557]  r4:da009000 r3:00000000
> [  258.217221] [<8052eb70>] (uvc_status_cleanup) from [<80524e64>] (uvc_delete+0x28/0x140)
> [  258.225704]  r4:da051c58 r3:00000000
> [  258.229322] [<80524e3c>] (uvc_delete) from [<80525098>] (uvc_release+0x40/0x44)
> [  258.237136]  r8:00000000 r7:da051c00 r6:da009428 r5:81506254 r4:da051c58 r3:da00951c
> [  258.245495] [<80525058>] (uvc_release) from [<80500a0c>] (v4l2_device_release+0xd0/0xf4)
> [  258.253608] [<8050093c>] (v4l2_device_release) from [<803e30f4>] (device_release+0x34/0x98)
> [  258.262529]  r8:da054070 r7:da026a40 r6:da021c00 r5:da051c58 r4:da051c60 r3:8050093c
> [  258.270519] [<803e30c0>] (device_release) from [<80323fd4>] (kobject_cleanup+0x98/0x1b8)
> [  258.279105]  r6:80c78848 r5:da051c60 r4:80cb61e8 r3:803e30c0
> [  258.284887] [<80323f3c>] (kobject_cleanup) from [<80323e6c>] (kobject_put+0x50/0x7c)
> [  258.292634]  r7:da054070 r6:da562258 r5:00000000 r4:da051c60
> [  258.298839] [<80323e1c>] (kobject_put) from [<803e350c>] (put_device+0x1c/0x20)
> [  258.306654]  r4:da051c00
> [  258.309221] [<803e34f0>] (put_device) from [<804ff73c>] (v4l2_release+0x58/0x7c)
> [  258.317133] [<804ff6e4>] (v4l2_release) from [<800f1444>] (__fput+0x9c/0x220)
> [  258.324554]  r5:da15e190 r4:da3c8dc0
> [  258.328171] [<800f13a8>] (__fput) from [<800f1624>] (____fput+0x10/0x14)
> [  258.335344]  r10:da306200 r9:da30c620 r8:00418004 r7:da306200 r6:80cc2180 r5:da3ee280
> [  258.343252]  r4:da306564
> [  258.346086] [<800f1614>] (____fput) from [<8003d198>] (task_work_run+0xa0/0xe4)
> [  258.353407] [<8003d0f8>] (task_work_run) from [<80025cb8>] (do_exit+0x280/0x8d0)
> [  258.361489]  r7:da30c624 r6:da3c229c r5:da306574 r4:da3c2240
> [  258.367266] [<80025a38>] (do_exit) from [<8002722c>] (do_group_exit+0x44/0xb8)
> [  258.375011]  r7:da30c624
> [  258.377584] [<800271e8>] (do_group_exit) from [<80031510>] (get_signal+0x254/0x6c8)
> [  258.385736]  r7:da30c624 r6:d81f7ed4 r5:00000009 r4:d81f6000
> [  258.391476] [<800312bc>] (get_signal) from [<80012190>] (do_signal+0x6c/0x3f4)
> [  258.399230]  r10:00000000 r9:d81f6000 r8:fffffe00 r7:d81f7ec0 r6:76ca6de6 r5:76ca6de4
> [  258.407190]  r4:d81f7fb0
> [  258.409751] [<80012124>] (do_signal) from [<800126c4>] (do_work_pending+0xa8/0xe8)
> [  258.418003]  r10:00000000 r9:d81f6000 r8:8000f3a4 r7:d81f7fb0 r6:8000f3a4 r5:d81f6000
> [  258.425959]  r4:d81f6008
> [  258.428519] [<8001261c>] (do_work_pending) from [<8000f238>] (work_pending+0xc/0x20)
> [  258.436967]  r7:00000036 r6:756065a8 r5:0193d3f8 r4:76b77b24
> [  258.442692] ---[ end trace cd2cc911d2f600ac ]---
> [  258.481579] ------------[ cut here ]------------
> [  258.487313] WARNING: CPU: 0 PID: 280 at fs/sysfs/group.c:220 sysfs_remove_group+0xb4/0xb8()
> [  258.496077] sysfs group 80c79200 not found for kobject 'input0'
> [  258.502005] Modules linked in: lock(O) usb_f_ecm g_ether usb_f_rndis u_ether libcomposite coda ath6kl_sdio ath6kl_core
> [  258.513158] CPU: 0 PID: 280 Comm: v4l2filter0:src Tainted: G        W  O   3.17.0-rc6-20140925-1+ #10
> [  258.523587] Backtrace:
> [  258.526208] [<80012ca4>] (dump_backtrace) from [<80012f94>] (show_stack+0x18/0x1c)
> [  258.533914]  r6:000000dc r5:00000009 r4:d81f7bc8 r3:00000000
> [  258.540589] [<80012f7c>] (show_stack) from [<807872e4>] (dump_stack+0x24/0x28)
> [  258.548471] [<807872c0>] (dump_stack) from [<80025140>] (warn_slowpath_common+0x78/0x90)
> [  258.557029] [<800250c8>] (warn_slowpath_common) from [<80025190>] (warn_slowpath_fmt+0x38/0x40)
> [  258.566077]  r8:00000000 r7:da051020 r6:da00a220 r5:00000000 r4:80c79200
> [  258.572879] [<8002515c>] (warn_slowpath_fmt) from [<8015bb4c>] (sysfs_remove_group+0xb4/0xb8)
> [  258.581992]  r3:80c79200 r2:8098e22c
> [  258.585681] [<8015ba98>] (sysfs_remove_group) from [<803ec5a4>] (dpm_sysfs_remove+0x54/0x58)
> [  258.594810]  r6:da00a218 r5:da00a220 r4:80c79200
> [  258.599506] [<803ec550>] (dpm_sysfs_remove) from [<803e3664>] (device_del+0x4c/0x1b0)
> [  258.607982]  r6:da00a000 r5:da00a218 r4:00000008 r3:da306200
> [  258.613738] [<803e3618>] (device_del) from [<804e69d0>] (__input_unregister_device+0x134/0x150)
> [  258.623046]  r7:da00a1b4 r6:da00a000 r5:00000007 r4:00000008
> [  258.629199] [<804e689c>] (__input_unregister_device) from [<804e7b50>] (input_unregister_device+0x50/0x78)
> [  258.639498]  r7:da051c00 r6:da009000 r5:81506254 r4:da00a000
> [  258.646041] [<804e7b00>] (input_unregister_device) from [<8052eba8>] (uvc_status_cleanup+0x38/0x3c)
> [  258.655588]  r4:da009000 r3:00000000
> [  258.659207] [<8052eb70>] (uvc_status_cleanup) from [<80524e64>] (uvc_delete+0x28/0x140)
> [  258.667690]  r4:da051c58 r3:00000000
> [  258.671308] [<80524e3c>] (uvc_delete) from [<80525098>] (uvc_release+0x40/0x44)
> [  258.679116]  r8:00000000 r7:da051c00 r6:da009428 r5:81506254 r4:da051c58 r3:da00951c
> [  258.687002] [<80525058>] (uvc_release) from [<80500a0c>] (v4l2_device_release+0xd0/0xf4)
> [  258.695592] [<8050093c>] (v4l2_device_release) from [<803e30f4>] (device_release+0x34/0x98)
> [  258.703953]  r8:da054070 r7:da026a40 r6:da021c00 r5:da051c58 r4:da051c60 r3:8050093c
> [  258.712128] [<803e30c0>] (device_release) from [<80323fd4>] (kobject_cleanup+0x98/0x1b8)
> [  258.720734]  r6:80c78848 r5:da051c60 r4:80cb61e8 r3:803e30c0
> [  258.726516] [<80323f3c>] (kobject_cleanup) from [<80323e6c>] (kobject_put+0x50/0x7c)
> [  258.734731]  r7:da054070 r6:da562258 r5:00000000 r4:da051c60
> [  258.740463] [<80323e1c>] (kobject_put) from [<803e350c>] (put_device+0x1c/0x20)
> [  258.748243]  r4:da051c00
> [  258.750807] [<803e34f0>] (put_device) from [<804ff73c>] (v4l2_release+0x58/0x7c)
> [  258.758684] [<804ff6e4>] (v4l2_release) from [<800f1444>] (__fput+0x9c/0x220)
> [  258.766125]  r5:da15e190 r4:da3c8dc0
> [  258.769743] [<800f13a8>] (__fput) from [<800f1624>] (____fput+0x10/0x14)
> [  258.776915]  r10:da306200 r9:da30c620 r8:00418004 r7:da306200 r6:80cc2180 r5:da3ee280
> [  258.785114]  r4:da306564
> [  258.787687] [<800f1614>] (____fput) from [<8003d198>] (task_work_run+0xa0/0xe4)
> [  258.795532] [<8003d0f8>] (task_work_run) from [<80025cb8>] (do_exit+0x280/0x8d0)
> [  258.802936]  r7:da30c624 r6:da3c229c r5:da306574 r4:da3c2240
> [  258.808947] [<80025a38>] (do_exit) from [<8002722c>] (do_group_exit+0x44/0xb8)
> [  258.816648]  r7:da30c624
> [  258.819219] [<800271e8>] (do_group_exit) from [<80031510>] (get_signal+0x254/0x6c8)
> [  258.827360]  r7:da30c624 r6:d81f7ed4 r5:00000009 r4:d81f6000
> [  258.833098] [<800312bc>] (get_signal) from [<80012190>] (do_signal+0x6c/0x3f4)
> [  258.840828]  r10:00000000 r9:d81f6000 r8:fffffe00 r7:d81f7ec0 r6:76ca6de6 r5:76ca6de4
> [  258.848786]  r4:d81f7fb0
> [  258.851346] [<80012124>] (do_signal) from [<800126c4>] (do_work_pending+0xa8/0xe8)
> [  258.859609]  r10:00000000 r9:d81f6000 r8:8000f3a4 r7:d81f7fb0 r6:8000f3a4 r5:d81f6000
> [  258.867567]  r4:d81f6008
> [  258.870126] [<8001261c>] (do_work_pending) from [<8000f238>] (work_pending+0xc/0x20)
> [  258.878543]  r7:00000036 r6:756065a8 r5:0193d3f8 r4:76b77b24
> [  258.884530] ---[ end trace cd2cc911d2f600ad ]---
> [  258.892863] ------------[ cut here ]------------
> [  258.898189] WARNING: CPU: 0 PID: 280 at fs/sysfs/group.c:220 sysfs_remove_group+0xb4/0xb8()
> [  258.906811] sysfs group 80c8a764 not found for kobject 'input0'
> [  258.912736] Modules linked in: lock(O) usb_f_ecm g_ether usb_f_rndis u_ether libcomposite coda ath6kl_sdio ath6kl_core
> [  258.923850] CPU: 0 PID: 280 Comm: v4l2filter0:src Tainted: G        W  O   3.17.0-rc6-20140925-1+ #10
> [  258.933569] Backtrace:
> [  258.936097] [<80012ca4>] (dump_backtrace) from [<80012f94>] (show_stack+0x18/0x1c)
> [  258.943671]  r6:000000dc r5:00000009 r4:d81f7bb0 r3:00000000
> [  258.949877] [<80012f7c>] (show_stack) from [<807872e4>] (dump_stack+0x24/0x28)
> [  258.957588] [<807872c0>] (dump_stack) from [<80025140>] (warn_slowpath_common+0x78/0x90)
> [  258.965957] [<800250c8>] (warn_slowpath_common) from [<80025190>] (warn_slowpath_fmt+0x38/0x40)
> [  258.974918]  r8:00000000 r7:80c8a578 r6:da00a220 r5:00000000 r4:80c8a764
> [  258.981703] [<8002515c>] (warn_slowpath_fmt) from [<8015bb4c>] (sysfs_remove_group+0xb4/0xb8)
> [  258.990724]  r3:80c8a764 r2:8098e22c
> [  258.994444] [<8015ba98>] (sysfs_remove_group) from [<8015bc04>] (sysfs_remove_groups+0x2c/0x3c)
> [  259.003147]  r6:80c8a590 r5:da00a220 r4:80c8a624
> [  259.008319] [<8015bbd8>] (sysfs_remove_groups) from [<803e303c>] (device_remove_attrs+0x58/0x74)
> [  259.017585]  r5:da00a220 r4:da00a218
> [  259.021207] [<803e2fe4>] (device_remove_attrs) from [<803e372c>] (device_del+0x114/0x1b0)
> [  259.029860]  r7:da051020 r6:da00a220 r5:da00a218 r4:dad9be5c
> [  259.035642] [<803e3618>] (device_del) from [<804e69d0>] (__input_unregister_device+0x134/0x150)
> [  259.044806]  r7:da00a1b4 r6:da00a000 r5:00000007 r4:00000008
> [  259.050541] [<804e689c>] (__input_unregister_device) from [<804e7b50>] (input_unregister_device+0x50/0x78)
> [  259.060693]  r7:da051c00 r6:da009000 r5:81506254 r4:da00a000
> [  259.066505] [<804e7b00>] (input_unregister_device) from [<8052eba8>] (uvc_status_cleanup+0x38/0x3c)
> [  259.076023]  r4:da009000 r3:00000000
> [  259.079642] [<8052eb70>] (uvc_status_cleanup) from [<80524e64>] (uvc_delete+0x28/0x140)
> [  259.088106]  r4:da051c58 r3:00000000
> [  259.091722] [<80524e3c>] (uvc_delete) from [<80525098>] (uvc_release+0x40/0x44)
> [  259.099491]  r8:00000000 r7:da051c00 r6:da009428 r5:81506254 r4:da051c58 r3:da00951c
> [  259.107368] [<80525058>] (uvc_release) from [<80500a0c>] (v4l2_device_release+0xd0/0xf4)
> [  259.115928] [<8050093c>] (v4l2_device_release) from [<803e30f4>] (device_release+0x34/0x98)
> [  259.124546]  r8:da054070 r7:da026a40 r6:da021c00 r5:da051c58 r4:da051c60 r3:8050093c
> [  259.132381] [<803e30c0>] (device_release) from [<80323fd4>] (kobject_cleanup+0x98/0x1b8)
> [  259.140968]  r6:80c78848 r5:da051c60 r4:80cb61e8 r3:803e30c0
> [  259.146747] [<80323f3c>] (kobject_cleanup) from [<80323e6c>] (kobject_put+0x50/0x7c)
> [  259.154978]  r7:da054070 r6:da562258 r5:00000000 r4:da051c60
> [  259.160711] [<80323e1c>] (kobject_put) from [<803e350c>] (put_device+0x1c/0x20)
> [  259.168496]  r4:da051c00
> [  259.171060] [<803e34f0>] (put_device) from [<804ff73c>] (v4l2_release+0x58/0x7c)
> [  259.178935] [<804ff6e4>] (v4l2_release) from [<800f1444>] (__fput+0x9c/0x220)
> [  259.186343]  r5:da15e190 r4:da3c8dc0
> [  259.189959] [<800f13a8>] (__fput) from [<800f1624>] (____fput+0x10/0x14)
> [  259.197161]  r10:da306200 r9:da30c620 r8:00418004 r7:da306200 r6:80cc2180 r5:da3ee280
> [  259.205361]  r4:da306564
> [  259.207932] [<800f1614>] (____fput) from [<8003d198>] (task_work_run+0xa0/0xe4)
> [  259.215734] [<8003d0f8>] (task_work_run) from [<80025cb8>] (do_exit+0x280/0x8d0)
> [  259.223137]  r7:da30c624 r6:da3c229c r5:da306574 r4:da3c2240
> [  259.229130] [<80025a38>] (do_exit) from [<8002722c>] (do_group_exit+0x44/0xb8)
> [  259.236844]  r7:da30c624
> [  259.239410] [<800271e8>] (do_group_exit) from [<80031510>] (get_signal+0x254/0x6c8)
> [  259.247760]  r7:da30c624 r6:d81f7ed4 r5:00000009 r4:d81f6000
> [  259.253505] [<800312bc>] (get_signal) from [<80012190>] (do_signal+0x6c/0x3f4)
> [  259.261226]  r10:00000000 r9:d81f6000 r8:fffffe00 r7:d81f7ec0 r6:76ca6de6 r5:76ca6de4
> [  259.269215]  r4:d81f7fb0
> [  259.271773] [<80012124>] (do_signal) from [<800126c4>] (do_work_pending+0xa8/0xe8)
> [  259.280054]  r10:00000000 r9:d81f6000 r8:8000f3a4 r7:d81f7fb0 r6:8000f3a4 r5:d81f6000
> [  259.288010]  r4:d81f6008
> [  259.290568] [<8001261c>] (do_work_pending) from [<8000f238>] (work_pending+0xc/0x20)
> [  259.298977]  r7:00000036 r6:756065a8 r5:0193d3f8 r4:76b77b24
> [  259.304748] ---[ end trace cd2cc911d2f600ae ]---
> [  259.313908] ------------[ cut here ]------------
> [  259.319437] WARNING: CPU: 0 PID: 280 at fs/sysfs/group.c:220 sysfs_remove_group+0xb4/0xb8()
> [  259.328075] sysfs group 80c8a630 not found for kobject 'input0'
> [  259.334001] Modules linked in: lock(O) usb_f_ecm g_ether usb_f_rndis u_ether libcomposite coda ath6kl_sdio ath6kl_core
> [  259.345180] CPU: 0 PID: 280 Comm: v4l2filter0:src Tainted: G        W  O   3.17.0-rc6-20140925-1+ #10
> [  259.354876] Backtrace:
> [  259.357359] [<80012ca4>] (dump_backtrace) from [<80012f94>] (show_stack+0x18/0x1c)
> [  259.365406]  r6:000000dc r5:00000009 r4:d81f7bb0 r3:00000000
> [  259.371147] [<80012f7c>] (show_stack) from [<807872e4>] (dump_stack+0x24/0x28)
> [  259.378856] [<807872c0>] (dump_stack) from [<80025140>] (warn_slowpath_common+0x78/0x90)
> [  259.387252] [<800250c8>] (warn_slowpath_common) from [<80025190>] (warn_slowpath_fmt+0x38/0x40)
> [  259.396262]  r8:00000000 r7:80c8a578 r6:da00a220 r5:00000000 r4:80c8a630
> [  259.403049] [<8002515c>] (warn_slowpath_fmt) from [<8015bb4c>] (sysfs_remove_group+0xb4/0xb8)
> [  259.412058]  r3:80c8a630 r2:8098e22c
> [  259.415748] [<8015ba98>] (sysfs_remove_group) from [<8015bc04>] (sysfs_remove_groups+0x2c/0x3c)
> [  259.424924]  r6:80c8a590 r5:da00a220 r4:80c8a628
> [  259.429604] [<8015bbd8>] (sysfs_remove_groups) from [<803e303c>] (device_remove_attrs+0x58/0x74)
> [  259.438873]  r5:da00a220 r4:da00a218
> [  259.442494] [<803e2fe4>] (device_remove_attrs) from [<803e372c>] (device_del+0x114/0x1b0)
> [  259.451143]  r7:da051020 r6:da00a220 r5:da00a218 r4:dad9be5c
> [  259.459353] [<803e3618>] (device_del) from [<804e69d0>] (__input_unregister_device+0x134/0x150)
> [  259.468788]  r7:da00a1b4 r6:da00a000 r5:00000007 r4:00000008
> [  259.474673] [<804e689c>] (__input_unregister_device) from [<804e7b50>] (input_unregister_device+0x50/0x78)
> [  259.484912]  r7:da051c00 r6:da009000 r5:81506254 r4:da00a000
> [  259.490656] [<804e7b00>] (input_unregister_device) from [<8052eba8>] (uvc_status_cleanup+0x38/0x3c)
> [  259.500189]  r4:da009000 r3:00000000
> [  259.503808] [<8052eb70>] (uvc_status_cleanup) from [<80524e64>] (uvc_delete+0x28/0x140)
> [  259.512287]  r4:da051c58 r3:00000000
> [  259.515948] [<80524e3c>] (uvc_delete) from [<80525098>] (uvc_release+0x40/0x44)
> [  259.523260]  r8:00000000 r7:da051c00 r6:da009428 r5:81506254 r4:da051c58 r3:da00951c
> [  259.531558] [<80525058>] (uvc_release) from [<80500a0c>] (v4l2_device_release+0xd0/0xf4)
> [  259.540130] [<8050093c>] (v4l2_device_release) from [<803e30f4>] (device_release+0x34/0x98)
> [  259.548753]  r8:da054070 r7:da026a40 r6:da021c00 r5:da051c58 r4:da051c60 r3:8050093c
> [  259.556668] [<803e30c0>] (device_release) from [<80323fd4>] (kobject_cleanup+0x98/0x1b8)
> [  259.565261]  r6:80c78848 r5:da051c60 r4:80cb61e8 r3:803e30c0
> [  259.570995] [<80323f3c>] (kobject_cleanup) from [<80323e6c>] (kobject_put+0x50/0x7c)
> [  259.579214]  r7:da054070 r6:da562258 r5:00000000 r4:da051c60
> [  259.584993] [<80323e1c>] (kobject_put) from [<803e350c>] (put_device+0x1c/0x20)
> [  259.592305]  r4:da051c00
> [  259.595383] [<803e34f0>] (put_device) from [<804ff73c>] (v4l2_release+0x58/0x7c)
> [  259.602793] [<804ff6e4>] (v4l2_release) from [<800f1444>] (__fput+0x9c/0x220)
> [  259.610614]  r5:da15e190 r4:da3c8dc0
> [  259.614503] [<800f13a8>] (__fput) from [<800f1624>] (____fput+0x10/0x14)
> [  259.621212]  r10:da306200 r9:da30c620 r8:00418004 r7:da306200 r6:80cc2180 r5:da3ee280
> [  259.629413]  r4:da306564
> [  259.631980] [<800f1614>] (____fput) from [<8003d198>] (task_work_run+0xa0/0xe4)
> [  259.639994] [<8003d0f8>] (task_work_run) from [<80025cb8>] (do_exit+0x280/0x8d0)
> [  259.647692]  r7:da30c624 r6:da3c229c r5:da306574 r4:da3c2240
> [  259.653422] [<80025a38>] (do_exit) from [<8002722c>] (do_group_exit+0x44/0xb8)
> [  259.661117]  r7:da30c624
> [  259.663688] [<800271e8>] (do_group_exit) from [<80031510>] (get_signal+0x254/0x6c8)
> [  259.671819]  r7:da30c624 r6:d81f7ed4 r5:00000009 r4:d81f6000
> [  259.677600] [<800312bc>] (get_signal) from [<80012190>] (do_signal+0x6c/0x3f4)
> [  259.685289]  r10:00000000 r9:d81f6000 r8:fffffe00 r7:d81f7ec0 r6:76ca6de6 r5:76ca6de4
> [  259.693197]  r4:d81f7fb0
> [  259.696049] [<80012124>] (do_signal) from [<800126c4>] (do_work_pending+0xa8/0xe8)
> [  259.703623]  r10:00000000 r9:d81f6000 r8:8000f3a4 r7:d81f7fb0 r6:8000f3a4 r5:d81f6000
> [  259.712000]  r4:d81f6008
> [  259.714816] [<8001261c>] (do_work_pending) from [<8000f238>] (work_pending+0xc/0x20)
> [  259.722563]  r7:00000036 r6:756065a8 r5:0193d3f8 r4:76b77b24
> [  259.728745] ---[ end trace cd2cc911d2f600af ]---
> [  259.735876] deleting dev: da0090a8
> [  259.739317] in sysfs_remove_group: power
> [  259.743245] ------------[ cut here ]------------
> [  259.748707] WARNING: CPU: 0 PID: 280 at fs/sysfs/group.c:220 sysfs_remove_group+0xb4/0xb8()
> [  259.757392] sysfs group 80c79200 not found for kobject 'media1'
> [  259.763319] Modules linked in: lock(O) usb_f_ecm g_ether usb_f_rndis u_ether libcomposite coda ath6kl_sdio ath6kl_core
> [  259.774565] CPU: 0 PID: 280 Comm: v4l2filter0:src Tainted: G        W  O   3.17.0-rc6-20140925-1+ #10
> [  259.783788] Backtrace:
> [  259.786771] [<80012ca4>] (dump_backtrace) from [<80012f94>] (show_stack+0x18/0x1c)
> [  259.794880]  r6:000000dc r5:00000009 r4:d81f7bc8 r3:00000000
> [  259.800622] [<80012f7c>] (show_stack) from [<807872e4>] (dump_stack+0x24/0x28)
> [  259.808395] [<807872c0>] (dump_stack) from [<80025140>] (warn_slowpath_common+0x78/0x90)
> [  259.816778] [<800250c8>] (warn_slowpath_common) from [<80025190>] (warn_slowpath_fmt+0x38/0x40)
> [  259.825750]  r8:00000000 r7:da051020 r6:da0090b0 r5:00000000 r4:80c79200
> [  259.832537] [<8002515c>] (warn_slowpath_fmt) from [<8015bb4c>] (sysfs_remove_group+0xb4/0xb8)
> [  259.841570]  r3:80c79200 r2:8098e22c
> [  259.845245] [<8015ba98>] (sysfs_remove_group) from [<803ec5a4>] (dpm_sysfs_remove+0x54/0x58)
> [  259.853687]  r6:da0090a8 r5:da0090b0 r4:80c79200
> [  259.858846] [<803ec550>] (dpm_sysfs_remove) from [<803e3664>] (device_del+0x4c/0x1b0)
> [  259.867159]  r6:da009098 r5:da0090a8 r4:da0090a8 r3:da306200
> [  259.872893] [<803e3618>] (device_del) from [<803e37f4>] (device_unregister+0x2c/0x6c)
> [  259.881206]  r7:da051c00 r6:da009098 r5:da00939c r4:da0090a8
> [  259.886987] [<803e37c8>] (device_unregister) from [<804fe768>] (media_devnode_unregister+0x58/0x5c)
> [  259.896543]  r4:da0090a0 r3:600f0013
> [  259.900164] [<804fe710>] (media_devnode_unregister) from [<804fe330>] (media_device_unregister+0x50/0x54)
> [  259.910260]  r4:da00939c r3:00000001
> [  259.913881] [<804fe2e0>] (media_device_unregister) from [<80524f74>] (uvc_delete+0x138/0x140)
> [  259.922900]  r6:da009000 r5:81506254 r4:da051c58 r3:00000001
> [  259.928674] [<80524e3c>] (uvc_delete) from [<80525098>] (uvc_release+0x40/0x44)
> [  259.936451]  r8:00000000 r7:da051c00 r6:da009428 r5:81506254 r4:da051c58 r3:da00951c
> [  259.944539] [<80525058>] (uvc_release) from [<80500a0c>] (v4l2_device_release+0xd0/0xf4)
> [  259.952645] [<8050093c>] (v4l2_device_release) from [<803e30f4>] (device_release+0x34/0x98)
> [  259.961478]  r8:da054070 r7:da026a40 r6:da021c00 r5:da051c58 r4:da051c60 r3:8050093c
> [  259.969371] [<803e30c0>] (device_release) from [<80323fd4>] (kobject_cleanup+0x98/0x1b8)
> [  259.977967]  r6:80c78848 r5:da051c60 r4:80cb61e8 r3:803e30c0
> [  259.983702] [<80323f3c>] (kobject_cleanup) from [<80323e6c>] (kobject_put+0x50/0x7c)
> [  259.991921]  r7:da054070 r6:da562258 r5:00000000 r4:da051c60
> [  259.997738] [<80323e1c>] (kobject_put) from [<803e350c>] (put_device+0x1c/0x20)
> [  260.005531]  r4:da051c00
> [  260.008096] [<803e34f0>] (put_device) from [<804ff73c>] (v4l2_release+0x58/0x7c)
> [  260.015976] [<804ff6e4>] (v4l2_release) from [<800f1444>] (__fput+0x9c/0x220)
> [  260.023119]  r5:da15e190 r4:da3c8dc0
> [  260.027004] [<800f13a8>] (__fput) from [<800f1624>] (____fput+0x10/0x14)
> [  260.033709]  r10:da306200 r9:da30c620 r8:00418004 r7:da306200 r6:80cc2180 r5:da3ee280
> [  260.042078]  r4:da306564
> [  260.044936] [<800f1614>] (____fput) from [<8003d198>] (task_work_run+0xa0/0xe4)
> [  260.052257] [<8003d0f8>] (task_work_run) from [<80025cb8>] (do_exit+0x280/0x8d0)
> [  260.060365]  r7:da30c624 r6:da3c229c r5:da306574 r4:da3c2240
> [  260.066144] [<80025a38>] (do_exit) from [<8002722c>] (do_group_exit+0x44/0xb8)
> [  260.073369]  r7:da30c624
> [  260.076398] [<800271e8>] (do_group_exit) from [<80031510>] (get_signal+0x254/0x6c8)
> [  260.084059]  r7:da30c624 r6:d81f7ed4 r5:00000009 r4:d81f6000
> [  260.090262] [<800312bc>] (get_signal) from [<80012190>] (do_signal+0x6c/0x3f4)
> [  260.097955]  r10:00000000 r9:d81f6000 r8:fffffe00 r7:d81f7ec0 r6:76ca6de6 r5:76ca6de4
> [  260.105910]  r4:d81f7fb0
> [  260.108469] [<80012124>] (do_signal) from [<800126c4>] (do_work_pending+0xa8/0xe8)
> [  260.116728]  r10:00000000 r9:d81f6000 r8:8000f3a4 r7:d81f7fb0 r6:8000f3a4 r5:d81f6000
> [  260.124899]  r4:d81f6008
> [  260.127463] [<8001261c>] (do_work_pending) from [<8000f238>] (work_pending+0xc/0x20)
> [  260.135694]  r7:00000036 r6:756065a8 r5:0193d3f8 r4:76b77b24
> [  260.141419] ---[ end trace cd2cc911d2f600b0 ]---
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index f8135f4..b58e46a 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -1626,15 +1626,10 @@ static void uvc_delete(struct uvc_device *dev)
>  	usb_put_intf(dev->intf);
>  	usb_put_dev(dev->udev);
>  
> -	uvc_status_cleanup(dev);
>  	uvc_ctrl_cleanup_device(dev);
>  
>  	if (dev->vdev.dev)
>  		v4l2_device_unregister(&dev->vdev);
> -#ifdef CONFIG_MEDIA_CONTROLLER
> -	if (media_devnode_is_registered(&dev->mdev.devnode))
> -		media_device_unregister(&dev->mdev);
> -#endif
>  
>  	list_for_each_safe(p, n, &dev->chains) {
>  		struct uvc_video_chain *chain;
> @@ -1705,6 +1700,11 @@ static void uvc_unregister_video(struct uvc_device *dev)
>  		uvc_debugfs_cleanup_stream(stream);
>  	}
>  
> +	uvc_status_cleanup(dev);
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +	if (media_devnode_is_registered(&dev->mdev.devnode))
> +		media_device_unregister(&dev->mdev);
> +#endif
>  	/* Decrement the stream count and call uvc_delete explicitly if there
>  	 * are no stream left.
>  	 */
> -- 
> 2.1.0
> 
> --
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> 

-- 
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