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-rw-r--r--block/elevator.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 2bcbd8cc14d4..249cc5e10906 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -186,6 +186,12 @@ int elevator_init(struct request_queue *q, char *name)
struct elevator_type *e = NULL;
int err;
+ /*
+ * q->sysfs_lock must be held to provide mutual exclusion between
+ * elevator_switch() and here.
+ */
+ lockdep_assert_held(&q->sysfs_lock);
+
if (unlikely(q->elevator))
return 0;