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authorTejun Heo <tj@kernel.org>2014-08-16 08:02:24 -0400
committerJens Axboe <axboe@fb.com>2014-08-21 20:37:51 -0500
commitcddd5d17642cc6881352732693c2ae6930e9ce65 (patch)
tree5fad9444dbe5b3d2347d43c2bfe77383573b9031 /drivers/block
parenta68aafa5b297d99c2d0c38689089a752126e9e79 (diff)
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blk-mq: blk_mq_freeze_queue() should allow nesting
While converting to percpu_ref for freezing, add703fda981 ("blk-mq: use percpu_ref for mq usage count") incorrectly made blk_mq_freeze_queue() misbehave when freezing is nested due to percpu_ref_kill() being invoked on an already killed ref. Fix it by making blk_mq_freeze_queue() kill and kick the queue only for the outermost freeze attempt. All the nested ones can simply wait for the ref to reach zero. While at it, remove unnecessary @wake initialization from blk_mq_unfreeze_queue(). Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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