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-rw-r--r--block/blk-mq.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 26a7f802d7ee..c13d03b2e17c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -4440,12 +4440,14 @@ static bool blk_mq_elv_switch_none(struct list_head *head,
if (!qe)
return false;
+ /* q->elevator needs protection from ->sysfs_lock */
+ mutex_lock(&q->sysfs_lock);
+
INIT_LIST_HEAD(&qe->node);
qe->q = q;
qe->type = q->elevator->type;
list_add(&qe->node, head);
- mutex_lock(&q->sysfs_lock);
/*
* After elevator_switch_mq, the previous elevator_queue will be
* released by elevator_release. The reference of the io scheduler