From 9d1deb83d489364f8749a3a1ba1689efb07d94b0 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Tue, 24 Feb 2015 20:49:18 -0500 Subject: [PATCH] dm: don't schedule delayed run of the queue if nothing to do In request-based DM's dm_request_fn(), if blk_peek_request() returns NULL just return. Avoids unnecessary blk_delay_queue(). Reported-by: Jens Axboe Signed-off-by: Mike Snitzer --- drivers/md/dm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 7924c00e0716..6f854287384b 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1963,7 +1963,7 @@ static void dm_request_fn(struct request_queue *q) while (!blk_queue_stopped(q)) { rq = blk_peek_request(q); if (!rq) - goto delay_and_out; + goto out; /* always use block 0 to find the target for flushes for now */ pos = 0; -- 2.20.1