forked from luck/tmp_suning_uos_patched
2b3cdf5819
commit 1c2b9519159b470ef24b2638f4794e86e2952ab7 upstream.
SB16 CSP driver may hit potentially a typical ABBA deadlock in two
code paths:
In snd_sb_csp_stop():
spin_lock_irqsave(&p->chip->mixer_lock, flags);
spin_lock(&p->chip->reg_lock);
In snd_sb_csp_load():
spin_lock_irqsave(&p->chip->reg_lock, flags);
spin_lock(&p->chip->mixer_lock);
Also the similar pattern is seen in snd_sb_csp_start().
Although the practical impact is very small (those states aren't
triggered in the same running state and this happens only on a real
hardware, decades old ISA sound boards -- which must be very difficult
to find nowadays), it's a real scenario and has to be fixed.
This patch addresses those deadlocks by splitting the locks in
snd_sb_csp_start() and snd_sb_csp_stop() for avoiding the nested
locks.
Reported-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/7b0fcdaf-cd4f-4728-2eae-48c151a92e10@gmail.com
Link: https://lore.kernel.org/r/20210716132723.13216-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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| .. | ||
| ad1816a | ||
| ad1848 | ||
| cs423x | ||
| es1688 | ||
| galaxy | ||
| gus | ||
| msnd | ||
| opti9xx | ||
| sb | ||
| wavefront | ||
| wss | ||
| adlib.c | ||
| als100.c | ||
| azt2320.c | ||
| cmi8328.c | ||
| cmi8330.c | ||
| es18xx.c | ||
| Kconfig | ||
| Makefile | ||
| opl3sa2.c | ||
| sc6000.c | ||
| sscape.c | ||