[PATCH 05/11] blkcg: make blkcg_activate_policy() allow NULL ->pd_init_fn

blkg_create() allows NULL ->pd_init_fn() but blkcg_activate_policy()
doesn't. As both in-kernel policies implement ->pd_init_fn, it
currently doesn't break anything. Update blkcg_activate_policy() so
that its behavior is consistent with blkg_create().

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
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 5dbbacd..b558705 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1079,7 +1079,8 @@ int blkcg_activate_policy(struct request_queue *q,
blkg->pd[pol->plid] = pd;
pd->blkg = blkg;
pd->plid = pol->plid;
- pol->pd_init_fn(blkg);
+ if (pol->pd_init_fn)
+ pol->pd_init_fn(blkg);
}

__set_bit(pol->plid, q->blkcg_pols);
--
2.4.3

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