linux-kernel - [PATCH 02/10] blkcg: make ->cpd_init

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Message-Id: <20190710205128.1316483-3-tj@kernel.org>
Date:   Wed, 10 Jul 2019 13:51:20 -0700
From:   Tejun Heo <tj@...nel.org>
To:     axboe@...nel.dk, newella@...com, clm@...com, josef@...icpanda.com,
        dennisz@...com, lizefan@...wei.com, hannes@...xchg.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/10] 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@...nel.org>
---
 block/blk-cgroup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 75f7f78b87b2..818e50b4cc7a 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1478,7 +1478,8 @@ 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);
 		}
 	}
 
-- 
2.17.1