https://github.com/torvalds/linux
Revision c6482dde1c2811afba289b2344268f850595f350 authored by Arjan van de Ven on 04 July 2006, 10:07:22 UTC, committed by Linus Torvalds on 04 July 2006, 17:24:57 UTC
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>
1 parent a46f948
Tip revision: c6482dde1c2811afba289b2344268f850595f350 authored by Arjan van de Ven on 04 July 2006, 10:07:22 UTC
[PATCH] fix AB-BA deadlock inversion at cs46xx_dsp_remove_scb
[PATCH] fix AB-BA deadlock inversion at cs46xx_dsp_remove_scb
Tip revision: c6482dd
| File | Mode | Size |
|---|---|---|
| oss | ||
| seq | ||
| Kconfig | -rw-r--r-- | 5.0 KB |
| Makefile | -rw-r--r-- | 870 bytes |
| control.c | -rw-r--r-- | 36.2 KB |
| control_compat.c | -rw-r--r-- | 11.2 KB |
| device.c | -rw-r--r-- | 7.0 KB |
| hwdep.c | -rw-r--r-- | 13.2 KB |
| hwdep_compat.c | -rw-r--r-- | 2.3 KB |
| info.c | -rw-r--r-- | 23.1 KB |
| info_oss.c | -rw-r--r-- | 4.0 KB |
| init.c | -rw-r--r-- | 20.0 KB |
| isadma.c | -rw-r--r-- | 2.8 KB |
| memalloc.c | -rw-r--r-- | 16.7 KB |
| memory.c | -rw-r--r-- | 2.5 KB |
| misc.c | -rw-r--r-- | 2.1 KB |
| pcm.c | -rw-r--r-- | 31.4 KB |
| pcm_compat.c | -rw-r--r-- | 15.0 KB |
| pcm_lib.c | -rw-r--r-- | 57.1 KB |
| pcm_memory.c | -rw-r--r-- | 11.4 KB |
| pcm_misc.c | -rw-r--r-- | 12.6 KB |
| pcm_native.c | -rw-r--r-- | 93.0 KB |
| pcm_timer.c | -rw-r--r-- | 4.1 KB |
| rawmidi.c | -rw-r--r-- | 48.6 KB |
| rawmidi_compat.c | -rw-r--r-- | 3.5 KB |
| rtctimer.c | -rw-r--r-- | 4.0 KB |
| sgbuf.c | -rw-r--r-- | 3.1 KB |
| sound.c | -rw-r--r-- | 10.6 KB |
| sound_oss.c | -rw-r--r-- | 7.3 KB |
| timer.c | -rw-r--r-- | 51.5 KB |
| timer_compat.c | -rw-r--r-- | 3.5 KB |
Computing file changes ...
