The USB DMA still appears to have problems when used with USB cameras.
It appears that whenever I attempt to issue controls via UVC to a camera
that is capturing, then I get the attached crash. PIO mode works fine.
Could I suggest that the default defconfig selects PIO mode until DMA
mode works reliably?
I hope this is the right place to post. If not, please excuse my
intrusion, and suggest another.
Best regards,
Dave.
--
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root@argus-dev:~# [ 60.007731] ------------[ cut here ]------------
[ 60.012617] WARNING: CPU: 0 PID: 702 at drivers/dma/cppi41.c:605
cppi41_dma_control+0x230/0x2ac()
[ 60.021920] Modules linked in: xfrm_user xfrm4_tunnel tunnel4 ipcomp
xfrm_ipcomp esp4 ah4 nfsd deflate ctr des_generic cbc ecb cmac af_key xfrm_algo
uvcvideo snd_usb_audio videobuf2_vmalloc videobuf2_memops snd_hwdep
snd_usbmidi_lib videobuf2_core snd_rawmidi snd_seq_device ti_am335x_adc
kfifo_buf industrialio rtc_omap uio_pdrv_genirq uio loop
[ 60.053997] CPU: 0 PID: 702 Comm: python Not tainted 3.13.6-bone7.1 #2
[ 60.060878] [<c001413c>] (unwind_backtrace+0x0/0xdc) from [<c0010ed8>]
(show_stack+0x10/0x14)
[ 60.069817] [<c0010ed8>] (show_stack+0x10/0x14) from [<c0700c00>]
(dump_stack+0x70/0x8c)
[ 60.078298] [<c0700c00>] (dump_stack+0x70/0x8c) from [<c0039a44>]
(warn_slowpath_common+0x64/0x88)
[ 60.087685] [<c0039a44>] (warn_slowpath_common+0x64/0x88) from [<c0039af8>]
(warn_slowpath_null+0x18/0x20)
[ 60.097799] [<c0039af8>] (warn_slowpath_null+0x18/0x20) from [<c040ea98>]
(cppi41_dma_control+0x230/0x2ac)
[ 60.107925] [<c040ea98>] (cppi41_dma_control+0x230/0x2ac) from [<c05170bc>]
(cppi41_dma_channel_abort+0x104/0x140)
[ 60.118771] [<c05170bc>] (cppi41_dma_channel_abort+0x104/0x140) from
[<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4)
[ 60.129887] [<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4) from
[<c05129bc>] (musb_urb_dequeue+0xf4/0x114)
[ 60.140190] [<c05129bc>] (musb_urb_dequeue+0xf4/0x114) from [<c04fafb0>]
(usb_hcd_unlink_urb+0x5c/0x7c)
[ 60.150033] [<c04fafb0>] (usb_hcd_unlink_urb+0x5c/0x7c) from [<c04fbd60>]
(usb_kill_urb+0x50/0xc4)
[ 60.159462] [<c04fbd60>] (usb_kill_urb+0x50/0xc4) from [<bf0994b8>]
(uvc_uninit_video+0x34/0x60 [uvcvideo])
[ 60.169706] [<bf0994b8>] (uvc_uninit_video+0x34/0x60 [uvcvideo]) from
[<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo])
[ 60.181391] [<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo]) from
[<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo])
[ 60.193343] [<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo]) from
[<c05499cc>] (video_usercopy+0x2ac/0x3e8)
[ 60.204200] [<c05499cc>] (video_usercopy+0x2ac/0x3e8) from [<c05453b4>]
(v4l2_ioctl+0x60/0x124)
[ 60.213319] [<c05453b4>] (v4l2_ioctl+0x60/0x124) from [<c012ebbc>]
(do_vfs_ioctl+0x4c8/0x588)
[ 60.222252] [<c012ebbc>] (do_vfs_ioctl+0x4c8/0x588) from [<c012ecc8>]
(SyS_ioctl+0x4c/0x78)
[ 60.231002] [<c012ecc8>] (SyS_ioctl+0x4c/0x78) from [<c000d8e0>]
(ret_fast_syscall+0x0/0x30)
[ 60.239839] ---[ end trace 936578196fc420af ]---
[ 60.244668] ------------[ cut here ]------------
[ 60.249505] WARNING: CPU: 0 PID: 702 at drivers/dma/cppi41.c:629
cppi41_dma_control+0x278/0x2ac()
[ 60.258791] Modules linked in: xfrm_user xfrm4_tunnel tunnel4 ipcomp
xfrm_ipcomp esp4 ah4 nfsd deflate ctr des_generic cbc ecb cmac af_key xfrm_algo
uvcvideo snd_usb_audio videobuf2_vmalloc videobuf2_memops snd_hwdep
snd_usbmidi_lib videobuf2_core snd_rawmidi snd_seq_device ti_am335x_adc
kfifo_buf industrialio rtc_omap uio_pdrv_genirq uio loop
[ 60.290795] CPU: 0 PID: 702 Comm: python Tainted: G W
3.13.6-bone7.1 #2
[ 60.298638] [<c001413c>] (unwind_backtrace+0x0/0xdc) from [<c0010ed8>]
(show_stack+0x10/0x14)
[ 60.307572] [<c0010ed8>] (show_stack+0x10/0x14) from [<c0700c00>]
(dump_stack+0x70/0x8c)
[ 60.316048] [<c0700c00>] (dump_stack+0x70/0x8c) from [<c0039a44>]
(warn_slowpath_common+0x64/0x88)
[ 60.325433] [<c0039a44>] (warn_slowpath_common+0x64/0x88) from [<c0039af8>]
(warn_slowpath_null+0x18/0x20)
[ 60.335546] [<c0039af8>] (warn_slowpath_null+0x18/0x20) from [<c040eae0>]
(cppi41_dma_control+0x278/0x2ac)
[ 60.345662] [<c040eae0>] (cppi41_dma_control+0x278/0x2ac) from [<c05170bc>]
(cppi41_dma_channel_abort+0x104/0x140)
[ 60.356505] [<c05170bc>] (cppi41_dma_channel_abort+0x104/0x140) from
[<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4)
[ 60.367620] [<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4) from
[<c05129bc>] (musb_urb_dequeue+0xf4/0x114)
[ 60.377918] [<c05129bc>] (musb_urb_dequeue+0xf4/0x114) from [<c04fafb0>]
(usb_hcd_unlink_urb+0x5c/0x7c)
[ 60.387760] [<c04fafb0>] (usb_hcd_unlink_urb+0x5c/0x7c) from [<c04fbd60>]
(usb_kill_urb+0x50/0xc4)
[ 60.397161] [<c04fbd60>] (usb_kill_urb+0x50/0xc4) from [<bf0994b8>]
(uvc_uninit_video+0x34/0x60 [uvcvideo])
[ 60.407391] [<bf0994b8>] (uvc_uninit_video+0x34/0x60 [uvcvideo]) from
[<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo])
[ 60.419076] [<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo]) from
[<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo])
[ 60.431022] [<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo]) from
[<c05499cc>] (video_usercopy+0x2ac/0x3e8)
[ 60.441864] [<c05499cc>] (video_usercopy+0x2ac/0x3e8) from [<c05453b4>]
(v4l2_ioctl+0x60/0x124)
[ 60.450979] [<c05453b4>] (v4l2_ioctl+0x60/0x124) from [<c012ebbc>]
(do_vfs_ioctl+0x4c8/0x588)
[ 60.459910] [<c012ebbc>] (do_vfs_ioctl+0x4c8/0x588) from [<c012ecc8>]
(SyS_ioctl+0x4c/0x78)
[ 60.468660] [<c012ecc8>] (SyS_ioctl+0x4c/0x78) from [<c000d8e0>]
(ret_fast_syscall+0x0/0x30)
[ 60.477494] ---[ end trace 936578196fc420b0 ]---
[ 60.482629] ------------[ cut here ]------------
[ 60.487478] WARNING: CPU: 0 PID: 702 at drivers/dma/cppi41.c:605
cppi41_dma_control+0x230/0x2ac()
[ 60.496766] Modules linked in: xfrm_user xfrm4_tunnel tunnel4 ipcomp
xfrm_ipcomp esp4 ah4 nfsd deflate ctr des_generic cbc ecb cmac af_key xfrm_algo
uvcvideo snd_usb_audio videobuf2_vmalloc videobuf2_memops snd_hwdep
snd_usbmidi_lib videobuf2_core snd_rawmidi snd_seq_device ti_am335x_adc
kfifo_buf industrialio rtc_omap uio_pdrv_genirq uio loop
[ 60.528777] CPU: 0 PID: 702 Comm: python Tainted: G W
3.13.6-bone7.1 #2
[ 60.536627] [<c001413c>] (unwind_backtrace+0x0/0xdc) from [<c0010ed8>]
(show_stack+0x10/0x14)
[ 60.545561] [<c0010ed8>] (show_stack+0x10/0x14) from [<c0700c00>]
(dump_stack+0x70/0x8c)
[ 60.554039] [<c0700c00>] (dump_stack+0x70/0x8c) from [<c0039a44>]
(warn_slowpath_common+0x64/0x88)
[ 60.563427] [<c0039a44>] (warn_slowpath_common+0x64/0x88) from [<c0039af8>]
(warn_slowpath_null+0x18/0x20)
[ 60.573540] [<c0039af8>] (warn_slowpath_null+0x18/0x20) from [<c040ea98>]
(cppi41_dma_control+0x230/0x2ac)
[ 60.583658] [<c040ea98>] (cppi41_dma_control+0x230/0x2ac) from [<c05170bc>]
(cppi41_dma_channel_abort+0x104/0x140)
[ 60.594502] [<c05170bc>] (cppi41_dma_channel_abort+0x104/0x140) from
[<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4)
[ 60.605617] [<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4) from
[<c05129bc>] (musb_urb_dequeue+0xf4/0x114)
[ 60.615915] [<c05129bc>] (musb_urb_dequeue+0xf4/0x114) from [<c04fafb0>]
(usb_hcd_unlink_urb+0x5c/0x7c)
[ 60.625757] [<c04fafb0>] (usb_hcd_unlink_urb+0x5c/0x7c) from [<c04fbd60>]
(usb_kill_urb+0x50/0xc4)
[ 60.635164] [<c04fbd60>] (usb_kill_urb+0x50/0xc4) from [<bf0994b8>]
(uvc_uninit_video+0x34/0x60 [uvcvideo])
[ 60.645395] [<bf0994b8>] (uvc_uninit_video+0x34/0x60 [uvcvideo]) from
[<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo])
[ 60.657079] [<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo]) from
[<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo])
[ 60.669027] [<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo]) from
[<c05499cc>] (video_usercopy+0x2ac/0x3e8)
[ 60.679875] [<c05499cc>] (video_usercopy+0x2ac/0x3e8) from [<c05453b4>]
(v4l2_ioctl+0x60/0x124)
[ 60.688990] [<c05453b4>] (v4l2_ioctl+0x60/0x124) from [<c012ebbc>]
(do_vfs_ioctl+0x4c8/0x588)
[ 60.697920] [<c012ebbc>] (do_vfs_ioctl+0x4c8/0x588) from [<c012ecc8>]
(SyS_ioctl+0x4c/0x78)
[ 60.706669] [<c012ecc8>] (SyS_ioctl+0x4c/0x78) from [<c000d8e0>]
(ret_fast_syscall+0x0/0x30)
[ 60.715502] ---[ end trace 936578196fc420b1 ]---
[ 60.720332] ------------[ cut here ]------------
[ 60.725166] WARNING: CPU: 0 PID: 702 at drivers/dma/cppi41.c:629
cppi41_dma_control+0x278/0x2ac()
[ 60.734451] Modules linked in: xfrm_user xfrm4_tunnel tunnel4 ipcomp
xfrm_ipcomp esp4 ah4 nfsd deflate ctr des_generic cbc ecb cmac af_key xfrm_algo
uvcvideo snd_usb_audio videobuf2_vmalloc videobuf2_memops snd_hwdep
snd_usbmidi_lib videobuf2_core snd_rawmidi snd_seq_device ti_am335x_adc
kfifo_buf industrialio rtc_omap uio_pdrv_genirq uio loop
[ 60.766452] CPU: 0 PID: 702 Comm: python Tainted: G W
3.13.6-bone7.1 #2
[ 60.774294] [<c001413c>] (unwind_backtrace+0x0/0xdc) from [<c0010ed8>]
(show_stack+0x10/0x14)
[ 60.783226] [<c0010ed8>] (show_stack+0x10/0x14) from [<c0700c00>]
(dump_stack+0x70/0x8c)
[ 60.791701] [<c0700c00>] (dump_stack+0x70/0x8c) from [<c0039a44>]
(warn_slowpath_common+0x64/0x88)
[ 60.801087] [<c0039a44>] (warn_slowpath_common+0x64/0x88) from [<c0039af8>]
(warn_slowpath_null+0x18/0x20)
[ 60.811201] [<c0039af8>] (warn_slowpath_null+0x18/0x20) from [<c040eae0>]
(cppi41_dma_control+0x278/0x2ac)
[ 60.821316] [<c040eae0>] (cppi41_dma_control+0x278/0x2ac) from [<c05170bc>]
(cppi41_dma_channel_abort+0x104/0x140)
[ 60.832159] [<c05170bc>] (cppi41_dma_channel_abort+0x104/0x140) from
[<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4)
[ 60.843274] [<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4) from
[<c05129bc>] (musb_urb_dequeue+0xf4/0x114)
[ 60.853570] [<c05129bc>] (musb_urb_dequeue+0xf4/0x114) from [<c04fafb0>]
(usb_hcd_unlink_urb+0x5c/0x7c)
[ 60.863412] [<c04fafb0>] (usb_hcd_unlink_urb+0x5c/0x7c) from [<c04fbd60>]
(usb_kill_urb+0x50/0xc4)
[ 60.872811] [<c04fbd60>] (usb_kill_urb+0x50/0xc4) from [<bf0994b8>]
(uvc_uninit_video+0x34/0x60 [uvcvideo])
[ 60.883039] [<bf0994b8>] (uvc_uninit_video+0x34/0x60 [uvcvideo]) from
[<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo])
[ 60.894722] [<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo]) from
[<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo])
[ 60.906667] [<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo]) from
[<c05499cc>] (video_usercopy+0x2ac/0x3e8)
[ 60.917509] [<c05499cc>] (video_usercopy+0x2ac/0x3e8) from [<c05453b4>]
(v4l2_ioctl+0x60/0x124)
[ 60.926624] [<c05453b4>] (v4l2_ioctl+0x60/0x124) from [<c012ebbc>]
(do_vfs_ioctl+0x4c8/0x588)
[ 60.935555] [<c012ebbc>] (do_vfs_ioctl+0x4c8/0x588) from [<c012ecc8>]
(SyS_ioctl+0x4c/0x78)
[ 60.944303] [<c012ecc8>] (SyS_ioctl+0x4c/0x78) from [<c000d8e0>]
(ret_fast_syscall+0x0/0x30)
[ 60.953136] ---[ end trace 936578196fc420b2 ]---
[ 60.958225] ------------[ cut here ]------------
[ 60.963074] WARNING: CPU: 0 PID: 702 at drivers/dma/cppi41.c:605
cppi41_dma_control+0x230/0x2ac()
[ 60.972360] Modules linked in: xfrm_user xfrm4_tunnel tunnel4 ipcomp
xfrm_ipcomp esp4 ah4 nfsd deflate ctr des_generic cbc ecb cmac af_key xfrm_algo
uvcvideo snd_usb_audio videobuf2_vmalloc videobuf2_memops snd_hwdep
snd_usbmidi_lib videobuf2_core snd_rawmidi snd_seq_device ti_am335x_adc
kfifo_buf industrialio rtc_omap uio_pdrv_genirq uio loop
[ 61.004364] CPU: 0 PID: 702 Comm: python Tainted: G W
3.13.6-bone7.1 #2
[ 61.012212] [<c001413c>] (unwind_backtrace+0x0/0xdc) from [<c0010ed8>]
(show_stack+0x10/0x14)
[ 61.021145] [<c0010ed8>] (show_stack+0x10/0x14) from [<c0700c00>]
(dump_stack+0x70/0x8c)
[ 61.029622] [<c0700c00>] (dump_stack+0x70/0x8c) from [<c0039a44>]
(warn_slowpath_common+0x64/0x88)
[ 61.039008] [<c0039a44>] (warn_slowpath_common+0x64/0x88) from [<c0039af8>]
(warn_slowpath_null+0x18/0x20)
[ 61.049121] [<c0039af8>] (warn_slowpath_null+0x18/0x20) from [<c040ea98>]
(cppi41_dma_control+0x230/0x2ac)
[ 61.059237] [<c040ea98>] (cppi41_dma_control+0x230/0x2ac) from [<c05170bc>]
(cppi41_dma_channel_abort+0x104/0x140)
[ 61.070082] [<c05170bc>] (cppi41_dma_channel_abort+0x104/0x140) from
[<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4)
[ 61.081198] [<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4) from
[<c05129bc>] (musb_urb_dequeue+0xf4/0x114)
[ 61.091496] [<c05129bc>] (musb_urb_dequeue+0xf4/0x114) from [<c04fafb0>]
(usb_hcd_unlink_urb+0x5c/0x7c)
[ 61.101338] [<c04fafb0>] (usb_hcd_unlink_urb+0x5c/0x7c) from [<c04fbd60>]
(usb_kill_urb+0x50/0xc4)
[ 61.110745] [<c04fbd60>] (usb_kill_urb+0x50/0xc4) from [<bf0994b8>]
(uvc_uninit_video+0x34/0x60 [uvcvideo])
[ 61.120975] [<bf0994b8>] (uvc_uninit_video+0x34/0x60 [uvcvideo]) from
[<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo])
[ 61.132659] [<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo]) from
[<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo])
[ 61.144605] [<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo]) from
[<c05499cc>] (video_usercopy+0x2ac/0x3e8)
[ 61.155453] [<c05499cc>] (video_usercopy+0x2ac/0x3e8) from [<c05453b4>]
(v4l2_ioctl+0x60/0x124)
[ 61.164568] [<c05453b4>] (v4l2_ioctl+0x60/0x124) from [<c012ebbc>]
(do_vfs_ioctl+0x4c8/0x588)
[ 61.173499] [<c012ebbc>] (do_vfs_ioctl+0x4c8/0x588) from [<c012ecc8>]
(SyS_ioctl+0x4c/0x78)
[ 61.182250] [<c012ecc8>] (SyS_ioctl+0x4c/0x78) from [<c000d8e0>]
(ret_fast_syscall+0x0/0x30)
[ 61.191084] ---[ end trace 936578196fc420b3 ]---
[ 61.195913] ------------[ cut here ]------------
[ 61.200748] WARNING: CPU: 0 PID: 702 at drivers/dma/cppi41.c:629
cppi41_dma_control+0x278/0x2ac()
[ 61.210035] Modules linked in: xfrm_user xfrm4_tunnel tunnel4 ipcomp
xfrm_ipcomp esp4 ah4 nfsd deflate ctr des_generic cbc ecb cmac af_key xfrm_algo
uvcvideo snd_usb_audio videobuf2_vmalloc videobuf2_memops snd_hwdep
snd_usbmidi_lib videobuf2_core snd_rawmidi snd_seq_device ti_am335x_adc
kfifo_buf industrialio rtc_omap uio_pdrv_genirq uio loop
[ 61.242036] CPU: 0 PID: 702 Comm: python Tainted: G W
3.13.6-bone7.1 #2
[ 61.249878] [<c001413c>] (unwind_backtrace+0x0/0xdc) from [<c0010ed8>]
(show_stack+0x10/0x14)
[ 61.258810] [<c0010ed8>] (show_stack+0x10/0x14) from [<c0700c00>]
(dump_stack+0x70/0x8c)
[ 61.267287] [<c0700c00>] (dump_stack+0x70/0x8c) from [<c0039a44>]
(warn_slowpath_common+0x64/0x88)
[ 61.276673] [<c0039a44>] (warn_slowpath_common+0x64/0x88) from [<c0039af8>]
(warn_slowpath_null+0x18/0x20)
[ 61.286785] [<c0039af8>] (warn_slowpath_null+0x18/0x20) from [<c040eae0>]
(cppi41_dma_control+0x278/0x2ac)
[ 61.296900] [<c040eae0>] (cppi41_dma_control+0x278/0x2ac) from [<c05170bc>]
(cppi41_dma_channel_abort+0x104/0x140)
[ 61.307742] [<c05170bc>] (cppi41_dma_channel_abort+0x104/0x140) from
[<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4)
[ 61.318856] [<c0512828>] (musb_cleanup_urb.isra.7+0x44/0xe4) from
[<c05129bc>] (musb_urb_dequeue+0xf4/0x114)
[ 61.329152] [<c05129bc>] (musb_urb_dequeue+0xf4/0x114) from [<c04fafb0>]
(usb_hcd_unlink_urb+0x5c/0x7c)
[ 61.338993] [<c04fafb0>] (usb_hcd_unlink_urb+0x5c/0x7c) from [<c04fbd60>]
(usb_kill_urb+0x50/0xc4)
[ 61.348393] [<c04fbd60>] (usb_kill_urb+0x50/0xc4) from [<bf0994b8>]
(uvc_uninit_video+0x34/0x60 [uvcvideo])
[ 61.358620] [<bf0994b8>] (uvc_uninit_video+0x34/0x60 [uvcvideo]) from
[<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo])
[ 61.370303] [<bf09b538>] (uvc_video_enable+0x18/0x124 [uvcvideo]) from
[<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo])
[ 61.382248] [<bf099160>] (uvc_v4l2_do_ioctl+0xd20/0xff4 [uvcvideo]) from
[<c05499cc>] (video_usercopy+0x2ac/0x3e8)
[ 61.393090] [<c05499cc>] (video_usercopy+0x2ac/0x3e8) from [<c05453b4>]
(v4l2_ioctl+0x60/0x124)
[ 61.402205] [<c05453b4>] (v4l2_ioctl+0x60/0x124) from [<c012ebbc>]
(do_vfs_ioctl+0x4c8/0x588)
[ 61.411136] [<c012ebbc>] (do_vfs_ioctl+0x4c8/0x588) from [<c012ecc8>]
(SyS_ioctl+0x4c/0x78)
[ 61.419885] [<c012ecc8>] (SyS_ioctl+0x4c/0x78) from [<c000d8e0>]
(ret_fast_syscall+0x0/0x30)
[ 61.428718] ---[ end trace 936578196fc420b4 ]---
[ 61.490757] uvcvideo: Failed to query (GET_CUR) UVC control 13 on unit 1:
-71 (exp. 8).
