Commit 8537380b authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-mq: skip non-mq queues in blk_mq_quiesce_queue 



For submit_bio based queues there is no (S)RCU critical section during
I/O submission and thus nothing to wait for in blk_mq_wait_quiesce_done,
so skip doing any synchronization.  No non-mq driver should be calling
this, but for now we have core callers that unconditionally call into it.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarChaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221101150050.3510-11-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 2b4c2355

block/blk-mq.c

+3 −1
Original line number Diff line number Diff line
@@ -280,6 +280,8 @@ EXPORT_SYMBOL_GPL(blk_mq_wait_quiesce_done); 
void blk_mq_quiesce_queue(struct request_queue *q)

{

	blk_mq_quiesce_queue_nowait(q);

	/* nothing to wait for non-mq queues */

	if (queue_is_mq(q))

		blk_mq_wait_quiesce_done(q);

}

EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue);