* [patch] blkcg: change a spin_lock() to spin_lock_irq()
@ 2012-03-29 18:51 Dan Carpenter
2012-03-29 18:57 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2012-03-29 18:51 UTC (permalink / raw)
To: Jens Axboe, Tejun Heo; +Cc: linux-kernel, kernel-janitors
Smatch complains that we re-enable IRQs twice. It looks like we forgot
to disable them here on the spin_trylock() failure path. This was added
in 9f13ef678e "blkcg: use double locking instead of RCU for blkg
synchronization".
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 74a76a8..bf4b76e 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1598,7 +1598,7 @@ static int blkiocg_pre_destroy(struct cgroup *cgroup)
} else {
spin_unlock_irq(&blkcg->lock);
cpu_relax();
- spin_lock(&blkcg->lock);
+ spin_lock_irq(&blkcg->lock);
}
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [patch] blkcg: change a spin_lock() to spin_lock_irq()
2012-03-29 18:51 [patch] blkcg: change a spin_lock() to spin_lock_irq() Dan Carpenter
@ 2012-03-29 18:57 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2012-03-29 18:57 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Tejun Heo, linux-kernel, kernel-janitors
On 2012-03-29 20:51, Dan Carpenter wrote:
> Smatch complains that we re-enable IRQs twice. It looks like we forgot
> to disable them here on the spin_trylock() failure path. This was added
> in 9f13ef678e "blkcg: use double locking instead of RCU for blkg
> synchronization".
Thanks, that is indeed a screwup. Fix applied.
--
Jens Axboe
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-03-29 18:51 [patch] blkcg: change a spin_lock() to spin_lock_irq() Dan Carpenter
2012-03-29 18:57 ` Jens Axboe
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