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| author | Arjan van de Ven <arjan@infradead.org> | 2006-07-04 03:07:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-04 10:24:57 -0700 |
| commit | c6482dde1c2811afba289b2344268f850595f350 (patch) | |
| tree | bfd2ab0c2bcfe6fe4de64bab40f2c19f25131a97 /Documentation | |
| parent | a46f9484f8926aacb2e79a0e1676de3a6a6fbae8 (diff) | |
| download | linux-c6482dde1c2811afba289b2344268f850595f350.tar.bz2 | |
[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>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions