blk-mq: avoid to synchronize rcu inside blk_cleanup_queue()

SCSI probing may synchronously create and destroy a lot of request_queues
for non-existent devices. Any synchronize_rcu() in queue creation or
destroy path may introduce long latency during booting, see detailed
description in comment of blk_register_queue().

This patch removes one synchronize_rcu() inside blk_cleanup_queue()
for this case, commit c2856ae2f315d75(blk-mq: quiesce queue before freeing queue)
needs synchronize_rcu() for implementing blk_mq_quiesce_queue(), but
when queue isn't initialized, it isn't necessary to do that since
only pass-through requests are involved, no original issue in
scsi_execute() at all.

Without this patch and previous one, it may take more 20+ seconds for
virtio-scsi to complete disk probe. With the two patches, the time becomes
less than 100ms.

Fixes: c2856ae2f315d75 ("blk-mq: quiesce queue before freeing queue")
Reported-by: Andrew Jones <drjones@redhat.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: linux-scsi@vger.kernel.org
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Tested-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-core.c b/block/blk-core.c
index f84a9b7b6f5aa167c5559079f095e3d3dff28f0d..947e7a4abd8c925b38bdc9179864841e2ecc640c 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -762,9 +762,13 @@ void blk_cleanup_queue(struct request_queue *q)
         * make sure all in-progress dispatch are completed because
         * blk_freeze_queue() can only complete all requests, and
         * dispatch may still be in-progress since we dispatch requests
-        * from more than one contexts
+        * from more than one contexts.
+        *
+        * No need to quiesce queue if it isn't initialized yet since
+        * blk_freeze_queue() should be enough for cases of passthrough
+        * request.
         */
-       if (q->mq_ops)
+       if (q->mq_ops && blk_queue_init_done(q))
                blk_mq_quiesce_queue(q);
 
        /* for synchronous bio-based driver finish in-flight integrity i/o */