[PATCH] blkcg: put back rcu lock in blkcg_bio_issue_check()

[Dennis Zhou]

I was a little overzealous in removing the rcu_read_lock() call from
blkcg_bio_issue_check() and it broke blk-throttle. Put it back.

Fixes: e35403a034bf ("blkcg: associate blkg when associating a device")
Signed-off-by: Dennis Zhou <den...@kernel.org>
---
 include/linux/blk-cgroup.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 752de1becb5c..bf13ecb0fe4f 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -764,6 +764,8 @@ static inline bool blkcg_bio_issue_check(struct 
request_queue *q,
        struct blkcg_gq *blkg;
        bool throtl = false;
 
+       rcu_read_lock();
+
        if (!bio->bi_blkg) {
                char b[BDEVNAME_SIZE];
 
@@ -791,6 +793,7 @@ static inline bool blkcg_bio_issue_check(struct 
request_queue *q,
 
        blkcg_bio_issue_init(bio);
 
+       rcu_read_unlock();
        return !throtl;
 }
 
-- 
2.17.1