ALSA: pcm: Allow aborting mutex lock at OSS read/write loops

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commit 900498a34a upstream.

PCM OSS read/write loops keep taking the mutex lock for the whole
read/write, and this might take very long when the exceptionally high
amount of data is given.  Also, since it invokes with mutex_lock(),
the concurrent read/write becomes unbreakable.

This patch tries to address these issues by replacing mutex_lock()
with mutex_lock_interruptible(), and also splits / re-takes the lock
at each read/write period chunk, so that it can switch the context
more finely if requested.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Takashi Iwai 2018-01-08 14:03:53 +01:00 • committed by Greg Kroah-Hartman

parent 28ac403265

commit 0b9c7ed68d

1 changed files with 21 additions and 15 deletions

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sound/core/oss/pcm_oss.c

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