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 |
|---|---|---|
| Kconfig | -rw-r--r-- | 4.3 KB |
| Makefile | -rw-r--r-- | 392 bytes |
| TODO | -rw-r--r-- | 944 bytes |
| af_ax25.c | -rw-r--r-- | 44.4 KB |
| ax25_addr.c | -rw-r--r-- | 5.6 KB |
| ax25_dev.c | -rw-r--r-- | 4.8 KB |
| ax25_ds_in.c | -rw-r--r-- | 7.1 KB |
| ax25_ds_subr.c | -rw-r--r-- | 5.1 KB |
| ax25_ds_timer.c | -rw-r--r-- | 5.9 KB |
| ax25_iface.c | -rw-r--r-- | 6.2 KB |
| ax25_in.c | -rw-r--r-- | 10.6 KB |
| ax25_ip.c | -rw-r--r-- | 5.2 KB |
| ax25_out.c | -rw-r--r-- | 8.6 KB |
| ax25_route.c | -rw-r--r-- | 11.1 KB |
| ax25_std_in.c | -rw-r--r-- | 11.1 KB |
| ax25_std_subr.c | -rw-r--r-- | 2.3 KB |
| ax25_std_timer.c | -rw-r--r-- | 4.3 KB |
| ax25_subr.c | -rw-r--r-- | 7.0 KB |
| ax25_timer.c | -rw-r--r-- | 5.4 KB |
| ax25_uid.c | -rw-r--r-- | 4.8 KB |
| sysctl_net_ax25.c | -rw-r--r-- | 6.6 KB |
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