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

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  [PATCH V7 1/6] blk-mq: only run hw queues for blk-mq Ming Lei <ming.lei@redhat.com> - 2017-09-30 08:20 +0200
    Re: [PATCH V7 1/6] blk-mq: only run hw queues for blk-mq Christoph Hellwig <hch@infradead.org> - 2017-10-02 22:50 +0200

#1742519 — [PATCH V7 1/6] blk-mq: only run hw queues for blk-mq

This patch just makes it explicitely.

Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Martin Steigerwald <martin@lichtvoll.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Ming Lei <ming.lei@redhat.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

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#1743244

Looks fine,

Reviewed-by: Christoph Hellwig <hch@lst.de>

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