[PATCH V5 01/10] blk-mq: only run hw queues for blk-mq

[Ming Lei]

This patch just makes it explicitely.

Tested-by: Cathy Avery <cav...@redhat.com>
Tested-by: Oleksandr Natalenko <oleksa...@natalenko.name>
Reviewed-by: Johannes Thumshirn <jthumsh...@suse.de>
Signed-off-by: Ming Lei <ming....@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