From: Tejun Heo <tj@kernel.org>
Date: Wed, 28 Aug 2019 22:05:52 +0000 (-0700)
Subject: blkcg: make ->cpd_init_fn() optional
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=86a5bba5c252e90d264c7460e29a0b9e633777e7;p=linux.git

blkcg: make ->cpd_init_fn() optional

For policies which can do enough initialization from ->cpd_alloc_fn(),
make ->cpd_init_fn() optional.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 6a82ca3fb5cf7..78ccbdcfe7236 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1475,7 +1475,8 @@ 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);
 		}
 	}