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-rw-r--r--block/elevator.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 4721834815bb..2944c129760c 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -628,34 +628,35 @@ static inline bool elv_support_iosched(struct request_queue *q)
/*
* For blk-mq devices supporting IO scheduling, we default to using mq-deadline,
- * if available, for single queue devices. If deadline isn't available OR we
- * have multiple queues, default to "none".
+ * if available, for single queue devices. If deadline isn't available OR
+ * deadline initialization fails OR we have multiple queues, default to "none".
*/
-int elevator_init_mq(struct request_queue *q)
+void elevator_init_mq(struct request_queue *q)
{
struct elevator_type *e;
- int err = 0;
+ int err;
if (!elv_support_iosched(q))
- return 0;
+ return;
if (q->nr_hw_queues != 1)
- return 0;
+ return;
WARN_ON_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags));
if (unlikely(q->elevator))
- goto out;
+ return;
e = elevator_get(q, "mq-deadline", false);
if (!e)
- goto out;
+ return;
err = blk_mq_init_sched(q, e);
- if (err)
+ if (err) {
+ pr_warn("\"%s\" elevator initialization failed, "
+ "falling back to \"none\"\n", e->elevator_name);
elevator_put(e);
-out:
- return err;
+ }
}