diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 6d218ac9007151949f37e4e43f105125d838e7bb..8038c2b83f8537ebb491dcef76ff44c814a7cc2c 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1570,7 +1570,8 @@ int blkcg_policy_register(struct blkcg_policy *pol)
 			blkcg->cpd[pol->plid] = cpd;
 			cpd->blkcg = blkcg;
 			cpd->plid = pol->plid;
-			pol->cpd_init_fn(cpd);
+			if (pol->cpd_init_fn)
+				pol->cpd_init_fn(cpd);
 		}
 	}