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linux-stable/sound
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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
..
ac97 ALSA: ac97: (cosmetic) align argument names 2020-09-03 09:27:27 +02:00
aoa ALSA: aoa: i2sbus: use DECLARE_COMPLETION_ONSTACK() macro 2020-09-03 09:26:52 +02:00
arm ASoC: arm: use asoc_rtd_to_cpu() / asoc_rtd_to_codec() macro for DAI pointer 2020-03-27 14:44:56 +00:00
atmel ALSA: atmel: ac97: clarify operator precedence 2020-09-03 09:27:34 +02:00
core ALSA: seq: oss: Avoid mutex lock for a long-time ioctl 2020-09-23 14:45:14 +02:00
drivers ALSA: aloop: Replace tasklet with work 2020-09-09 18:33:36 +02:00
firewire ALSA: firewire: Replace tasklet with work 2020-09-11 18:22:54 +02:00
hda ALSA: hda - fix CONTROLLER_IN_GPU macro name 2020-09-21 17:58:47 +02:00
i2c
isa sound fixes for 5.9-rc2 2020-08-21 10:07:54 -07:00
mips ALSA: sgio2audio: Remove usage of dropped hw_params/hw_free functions 2020-03-06 12:06:41 +01:00
oss ALSA: Use fallthrough pseudo-keyword 2020-07-09 13:01:29 +02:00
parisc
pci ALSA: hda - controller is in GPU on the DG1 2020-09-21 17:57:21 +02:00
pcmcia ALSA: Use fallthrough pseudo-keyword 2020-07-09 13:01:29 +02:00
ppc ALSA: Replace the word "slave" in vmaster API 2020-07-20 10:10:47 +02:00
sh
soc ASoC: txx9: convert tasklets to use new tasklet_setup() API 2020-09-02 13:26:33 +02:00
sparc ALSA: Replace HTTP links with HTTPS ones 2020-07-19 20:49:25 +02:00
spi
synth
usb ALSA: usb-audio: Add mixer support for Pioneer DJ DJM-250MK2 2020-09-23 14:40:52 +02:00
x86 ALSA: hda: use consistent HDAudio spelling in comments/docs 2020-09-02 19:31:32 +02:00
xen ALSA: xen: Remove superfluous fall through comments 2020-07-09 19:10:37 +02:00
ac97_bus.c
Kconfig
last.c
Makefile
sound_core.c