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Block: fix unbalanced bypass-disable in blk_register_queue 

When a queue is registered, the block layer turns off the bypass
setting (because bypass is enabled when the queue is created).  This
doesn't work well for queues that are unregistered and then registered
again; we get a WARNING because of the unbalanced calls to
blk_queue_bypass_end().

This patch fixes the problem by making blk_register_queue() call
blk_queue_bypass_end() only the first time the queue is registered.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Tejun Heo <tj@kernel.org>
CC: James Bottomley <James.Bottomley@HansenPartnership.com>
CC: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Alan Stern 2014-09-09 11:50:58 -04:00 committed by Jens Axboe
parent 2da78092dd
commit df35c7c912
1 changed files with 4 additions and 2 deletions
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6
block/blk-sysfs.c
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@ -554,8 +554,10 @@ int blk_register_queue(struct gendisk *disk)
* Initialization must be complete by now. Finish the initial
* bypass from queue allocation.
*/
queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
blk_queue_bypass_end(q);
if (!blk_queue_init_done(q)) {
queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
blk_queue_bypass_end(q);
}
ret = blk_trace_init_sysfs(dev);
if (ret)