https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194727

--- Comment #22 from commit-h...@freebsd.org ---
A commit references this bug:

Author: hselasky
Date: Wed Mar  4 17:23:21 UTC 2020
New revision: 358629
URL: https://svnweb.freebsd.org/changeset/base/358629

Log:
  Implement a detaching flag for the sound(4) subsystem to take
  appropriate actions when we are trying to detach an audio device,
  but cannot because someone is using it.

  This avoids applications having to wait for the DSP read data
  timeout before they receive any error indication.
  Tested with virtual_oss(8).

  Remove some unused definitions while at it.

  PR:           194727
  MFC after:    1 week
  Sponsored by: Mellanox Technologies

Changes:
  head/sys/dev/sound/pcm/dsp.c
  head/sys/dev/sound/pcm/mixer.c
  head/sys/dev/sound/pcm/sound.c
  head/sys/dev/sound/pcm/sound.h

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