diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 5a37188b559f..9d359e05fad7 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1331,10 +1331,8 @@ int blkcg_policy_register(struct blkcg_policy *pol)
 			struct blkcg_policy_data *cpd;
 
 			cpd = pol->cpd_alloc_fn(GFP_KERNEL);
-			if (!cpd) {
-				mutex_unlock(&blkcg_pol_mutex);
+			if (!cpd)
 				goto err_free_cpds;
-			}
 
 			blkcg->cpd[pol->plid] = cpd;
 			cpd->blkcg = blkcg;