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linux/sound/core/seq/oss
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Takashi Iwai 2759caad26 ALSA: seq: oss: Avoid mutex lock for a long-time ioctl 
Recently we applied a fix to cover the whole OSS sequencer ioctls with
the mutex for dealing with the possible races.  This works fine in
general, but in theory, this may lead to unexpectedly long stall if an
ioctl like SNDCTL_SEQ_SYNC is issued and an event with the far future
timestamp was queued.

For fixing such a potential stall, this patch changes the mutex lock
applied conditionally excluding such an ioctl command.  Also, change
the mutex_lock() with the interruptible version for user to allow
escaping from the big-hammer mutex.

Fixes: 80982c7e83 ("ALSA: seq: oss: Serialize ioctls")
Suggested-by: Pavel Machek <pavel@ucw.cz>
Link: https://lore.kernel.org/r/20200922083856.28572-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-09-23 14:45:14 +02:00
..
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
seq_oss_device.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_event.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_event.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_init.c ALSA: seq: More constifications 2020-01-05 16:14:29 +01:00
seq_oss_ioctl.c sound fixes for 5.2 2019-07-05 02:03:50 +09:00
seq_oss_midi.c ALSA: seq: oss: Fix running status after receiving sysex 2020-03-16 10:06:40 +01:00
seq_oss_midi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_readq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_readq.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_rw.c sound fixes for 5.2 2019-07-05 02:03:50 +09:00
seq_oss_synth.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_synth.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_timer.c ALSA: Use fallthrough pseudo-keyword 2020-07-09 13:01:29 +02:00
seq_oss_timer.h ALSA: seq: oss: remove unused inline function snd_seq_oss_timer_is_realtime 2020-04-29 15:58:55 +02:00
seq_oss_writeq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss_writeq.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
seq_oss.c ALSA: seq: oss: Avoid mutex lock for a long-time ioctl 2020-09-23 14:45:14 +02:00