block: avoid setting nr_requests to current value

There's no reason to freeze queue and set nr_requests value if current value is the same. Signed-off-by: Aleksei Zakharov <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
niw · Feb 8, 2019 · e5fa814 · e5fa814
1 parent f25191b
commit e5fa814
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/block/blk-mq.c b/block/blk-mq.c
@@ -3089,6 +3089,9 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
 	if (!set)
 		return -EINVAL;
 
+	if (q->nr_requests == nr)
+		return 0;
+
 	blk_mq_freeze_queue(q);
 	blk_mq_quiesce_queue(q);