drm: Improve on minor type helpers v3

[platform/adaptation/renesas_rcar/renesas_kernel.git] / block / blk-cgroup.h

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 86154ea..c135f56 100644 (file)
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -18,6 +18,7 @@
 #include <linux/seq_file.h>
 #include <linux/radix-tree.h>
 #include <linux/blkdev.h>
+#include <linux/atomic.h>
 
 /* Max limits for throttle policy */
 #define THROTL_IOPS_MAX                UINT_MAX
@@ -104,7 +105,7 @@ struct blkcg_gq {
        struct request_list             rl;
 
        /* reference count */
-       int                             refcnt;
+       atomic_t                        refcnt;
 
        /* is this blkg online? protected by both blkcg and q locks */
        bool                            online;
@@ -253,13 +254,12 @@ static inline int blkg_path(struct blkcg_gq *blkg, char *buf, int buflen)
  * blkg_get - get a blkg reference
  * @blkg: blkg to get
  *
- * The caller should be holding queue_lock and an existing reference.
+ * The caller should be holding an existing reference.
  */
 static inline void blkg_get(struct blkcg_gq *blkg)
 {
-       lockdep_assert_held(blkg->q->queue_lock);
-       WARN_ON_ONCE(!blkg->refcnt);
-       blkg->refcnt++;
+       WARN_ON_ONCE(atomic_read(&blkg->refcnt) <= 0);
+       atomic_inc(&blkg->refcnt);
 }
 
 void __blkg_release_rcu(struct rcu_head *rcu);
@@ -267,14 +267,11 @@ void __blkg_release_rcu(struct rcu_head *rcu);
 /**
  * blkg_put - put a blkg reference
  * @blkg: blkg to put
- *
- * The caller should be holding queue_lock.
  */
 static inline void blkg_put(struct blkcg_gq *blkg)
 {
-       lockdep_assert_held(blkg->q->queue_lock);
-       WARN_ON_ONCE(blkg->refcnt <= 0);
-       if (!--blkg->refcnt)
+       WARN_ON_ONCE(atomic_read(&blkg->refcnt) <= 0);
+       if (atomic_dec_and_test(&blkg->refcnt))
                call_rcu(&blkg->rcu_head, __blkg_release_rcu);
 }