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c6482dde1c
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Arjan van de Ven c6482dde1c [PATCH] fix AB-BA deadlock inversion at cs46xx_dsp_remove_scb 
There is a code sequence where the locking is substream->self_group.lock
-> ins->scbs[index].lock

substream->self_group.lock is interrupt safe, and taken from irq context
as well (trace is snipped for brevity)

so what can happen is

   cpu 0                   	cpu 1
   user context			user context

				take ins->scbs[index].lock without disabling interrupts

   get substream->self_group.lock (irqsafe)
   try to get ins->scbs[index].lock (spins)

				interrupt happens
				try to get substream->self_group.lock (spins)

which is an obvious AB-BA deadlock

fix is to just take the lock with _irqsafe

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Jaroslav Kysela <perex@suse.cz>
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-04 10:24:57 -07:00
..
ac97
ali5451 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
au88x0 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ca0106 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
cs46xx [PATCH] fix AB-BA deadlock inversion at cs46xx_dsp_remove_scb 2006-07-04 10:24:57 -07:00
cs5535audio [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
echoaudio [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
emu10k1 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
hda [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ice1712 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
korg1212 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
mixart [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
nm256 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
pcxhr [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
riptide [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
rme9652 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
trident [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
vx222 [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ymfpci [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ad1889.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ad1889.h
als300.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
als4000.c
atiixp_modem.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
atiixp.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
azt3328.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
azt3328.h
bt87x.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
cmipci.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
cs4281.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ens1370.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
ens1371.c
es1938.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
es1968.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
fm801.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
intel8x0.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
intel8x0m.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
Kconfig
maestro3.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
Makefile
rme32.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
rme96.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
sonicvibes.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
via82xx_modem.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00
via82xx.c [PATCH] irq-flags: sound: Use the new IRQF_ constants 2006-07-02 13:58:54 -07:00