linux-kernel - [PATCH V7 1/6] blk-mq: only run hw queues for blk-mq

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Date:   Sat, 30 Sep 2017 14:12:09 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        linux-scsi@...r.kernel.org,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>
Cc:     Bart Van Assche <bart.vanassche@...disk.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Cathy Avery <cavery@...hat.com>,
        Martin Steigerwald <martin@...htvoll.de>,
        linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        Ming Lei <ming.lei@...hat.com>,
        Bart Van Assche <Bart.VanAssche@....com>
Subject: [PATCH V7 1/6] blk-mq: only run hw queues for blk-mq

This patch just makes it explicitely.

Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Tested-by: Martin Steigerwald <martin@...htvoll.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
Cc: Bart Van Assche <Bart.VanAssche@....com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 block/blk-mq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 98a18609755e..6fd9f86fc86d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -125,7 +125,8 @@ void blk_freeze_queue_start(struct request_queue *q)
 	freeze_depth = atomic_inc_return(&q->mq_freeze_depth);
 	if (freeze_depth == 1) {
 		percpu_ref_kill(&q->q_usage_counter);
-		blk_mq_run_hw_queues(q, false);
+		if (q->mq_ops)
+			blk_mq_run_hw_queues(q, false);
 	}
 }
 EXPORT_SYMBOL_GPL(blk_freeze_queue_start);
-- 
2.9.5