diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index ce5858dadca5..3ee4c1217b63 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1360,6 +1360,10 @@ retry:
 		list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
 			pol->pd_init_fn(blkg->pd[pol->plid]);
 
+	if (pol->pd_online_fn)
+		list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
+			pol->pd_online_fn(blkg->pd[pol->plid]);
+
 	__set_bit(pol->plid, q->blkcg_pols);
 	ret = 0;