tree 2950f7017ed99ee7f5c6158db90f06b260b6a312
parent 3a00564cb49f17e5ca2a1d6e34c7ea7b1113f49e
author Takashi Iwai <tiwai@suse.de> 1515416633 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1516178331 +0100

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

commit 900498a34a3ac9c611e9b425094c8106bdd7dc1c 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>