Takashi Iwai 2ba1fe7a06 ALSA: hrtimer: Fix stall by hrtimer_cancel() ... hrtimer_cancel() waits for the completion from the callback, thus it must not be called inside the callback itself. This was already a problem in the past with ALSA hrtimer driver, and the early commit [fcfdebe707: ALSA: hrtimer - Fix lock-up] tried to address it. However, the previous fix is still insufficient: it may still cause a lockup when the ALSA timer instance reprograms itself in its callback. Then it invokes the start function even in snd_timer_interrupt() that is called in hrtimer callback itself, results in a CPU stall. This is no hypothetical problem but actually triggered by syzkaller fuzzer. This patch tries to fix the issue again. Now we call hrtimer_try_to_cancel() at both start and stop functions so that it won't fall into a deadlock, yet giving some chance to cancel the queue if the functions have been called outside the callback. The proper hrtimer_cancel() is called in anyway at closing, so this should be enough. Reported-and-tested-by: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>		2016-01-18 14:33:30 +01:00
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aoa
arm
atmel
core	ALSA: hrtimer: Fix stall by hrtimer_cancel()	2016-01-18 14:33:30 +01:00
drivers	ALSA: dummy: constify dummy_timer_ops structures	2015-12-30 22:49:42 +01:00
firewire	ALSA: dice: expand timeout to wait for Dice notification	2016-01-06 10:18:54 +01:00
hda	ASoC: Last updates for v4.5	2016-01-11 17:50:15 +01:00
i2c
isa
mips
oss
parisc
pci	ALSA: hda - Fix bass pin fixup for ASUS N550JX	2016-01-18 09:17:30 +01:00
pcmcia
ppc
sh
soc	ASoC: Last updates for v4.5	2016-01-11 17:50:15 +01:00
sparc
spi
synth	ALSA: emux: constify nrpn_conv_table structures	2016-01-06 10:19:49 +01:00
usb	ALSA: usb-audio: Fix mixer ctl regression of Native Instrument devices	2016-01-13 07:24:07 +01:00
ac97_bus.c
Kconfig
last.c
Makefile
sound_core.c
sound_firmware.c