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-rw-r--r--block/elevator.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 8400e303fbcb..5ff093cb3cf8 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -499,6 +499,9 @@ void elv_unregister_queue(struct request_queue *q)
int elv_register(struct elevator_type *e)
{
+ /* finish request is mandatory */
+ if (WARN_ON_ONCE(!e->ops.finish_request))
+ return -EINVAL;
/* insert_requests and dispatch_request are mandatory */
if (WARN_ON_ONCE(!e->ops.insert_requests || !e->ops.dispatch_request))
return -EINVAL;