usb audio pcm_close call stack

 from [] (deactivate_urbs+0x8c/0x1ec)

<4>[  130.710274] [] (deactivate_urbs+0x0/0x1ec) from [] (snd_usb_substream_capture_trigger+0x68/0x94)

<4>[  130.710295] [] (snd_usb_substream_capture_trigger+0x0/0x94) from [] (snd_pcm_do_stop+0x54/0x60)

<4>[  130.710313] [] (snd_pcm_do_stop+0x0/0x60) from [] (snd_pcm_action_single+0x40/0x70)

<4>[  130.710331] [] (snd_pcm_action_single+0x0/0x70) from [] (snd_pcm_action+0x78/0x88)

<4>[  130.710343]  r7:c060cf40 r6:00000001 r5:d987cd8c r4:d987cd00

<4>[  130.710369] [] (snd_pcm_action+0x0/0x88) from [] (snd_pcm_stop+0x1c/0x28)

<4>[  130.710380]  r7:00000000 r6:d55fd800 r5:d987cd8c r4:d987cd00

<4>[  130.710406] [] (snd_pcm_stop+0x0/0x28) from [] (snd_pcm_drop+0xac/0xe8)

<4>[  130.710423] [] (snd_pcm_drop+0x0/0xe8) from [] (snd_pcm_release_substream+0x28/0xb0)

<4>[  130.710434]  r7:d914e520 r6:d987cd00 r5:d569e820 r4:d987cd00

<4>[  130.710461] [] (snd_pcm_release_substream+0x0/0xb0) from [] (snd_pcm_release+0x54/0xa8)

<4>[  130.710473]  r5:d569e820 r4:d914e400

<4>[  130.710497] [] (snd_pcm_release+0x0/0xa8) from [] (fput+0x134/0x1f0)

<4>[  130.710507]  r9:d9a67aa0 r8:d569e828 r7:00000008 r6:d94e77f8 r5:d92c2258

<4>[  130.710530] r4:d569e820

<4>[  130.710546] [] (fput+0x0/0x1f0) from [] (filp_close+0x74/0x84)

<4>[  130.710562] [] (filp_close+0x0/0x84) from [] (sys_close+0xb0/0xf4)

<4>[  130.710572]  r7:d569e820 r6:d9b06e40 r5:00000042 r4:d9b06e00

<4>[  130.710604] [] (sys_close+0x0/0xf4) from [] (ret_fast_syscall+0x0/0x30)