blkcg: make blkg_conf_prep() take @pol and return with queue lock held

Add @pol to blkg_conf_prep() and let it return with queue lock held
(to be released by blkg_conf_finish()).  Note that @pol isn't used
yet.

This is to prepare for per-queue policy activation and doesn't cause
any visible difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 08db2fc70c29..de95f9a2acf8 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1400,7 +1400,7 @@ static int cfqg_set_weight_device(struct cgroup *cgrp, struct cftype *cft,
         struct cfq_group *cfqg;
         int ret;
 
-        ret = blkg_conf_prep(blkcg, buf, &ctx);
+        ret = blkg_conf_prep(blkcg, &blkio_policy_cfq, buf, &ctx);
         if (ret)
                 return ret;