ALSA: pcm: Return negative delays from SNDRV_PCM_IOCTL_DELAY.

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commit 912e4c3320 upstream.

The commit c2c86a9717 ("ALSA: pcm: Remove set_fs() in PCM core code")
changed SNDRV_PCM_IOCTL_DELAY to return an inconsistent error instead of a
negative delay.  Originally the call would succeed and return the negative
delay.  The Chromium OS Audio Server (CRAS) gets confused and hangs when
the error is returned instead of the negative delay.

Help CRAS avoid the issue by rolling back the behavior to return a
negative delay instead of an error.

Fixes: c2c86a9717 ("ALSA: pcm: Remove set_fs() in PCM core code")
Signed-off-by: Jeffery Miller <jmiller@neverware.com>
Cc: <stable@vger.kernel.org> # v4.13+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Jeffery Miller 2018-04-20 23:20:46 -05:00 • committed by Greg Kroah-Hartman

parent 6ab1a94d17

commit 00e0495d83

2 changed files with 15 additions and 15 deletions

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7

sound/core/pcm_compat.c

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23

sound/core/pcm_native.c

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