From: Jianchao Wang <jianchao.w.wang@oracle.com>
Date: Mon, 4 Jun 2018 09:03:55 +0000 (+0800)
Subject: blk-mq: return when hctx is stopped in blk_mq_run_work_fn
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0196d6b4088f43519576dc4b58ce28b6722dde3a;p=openwrt%2Fstaging%2Fblogic.git

blk-mq: return when hctx is stopped in blk_mq_run_work_fn

If a hardware queue is stopped, it should not be run again before
explicitly started. Ignore stopped queues in blk_mq_run_work_fn(),
fixing a regression recently introduced when the START_ON_RUN bit
was removed.

Fixes: 15fe8a90bb45 ("blk-mq: remove blk_mq_delay_queue()")
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6332940ca118..d2de0a719ab8 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1475,7 +1475,7 @@ static void blk_mq_run_work_fn(struct work_struct *work)
 	 * If we are stopped, don't run the queue.
 	 */
 	if (test_bit(BLK_MQ_S_STOPPED, &hctx->state))
-		clear_bit(BLK_MQ_S_STOPPED, &hctx->state);
+		return;
 
 	__blk_mq_run_hw_queue(hctx);
 }