summaryrefslogtreecommitdiffstats
path: root/block/blk-cgroup.c
diff options
context:
space:
mode:
Diffstat (limited to 'block/blk-cgroup.c')
-rw-r--r--block/blk-cgroup.c34
1 files changed, 16 insertions, 18 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 6bbe0a939596..d0747605f56c 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -369,13 +369,17 @@ static void blkg_destroy_all(struct request_queue *q)
q->root_rl.blkg = NULL;
}
-static void blkg_rcu_free(struct rcu_head *rcu_head)
-{
- blkg_free(container_of(rcu_head, struct blkcg_gq, rcu_head));
-}
-
-void __blkg_release(struct blkcg_gq *blkg)
+/*
+ * A group is RCU protected, but having an rcu lock does not mean that one
+ * can access all the fields of blkg and assume these are valid. For
+ * example, don't try to follow throtl_data and request queue links.
+ *
+ * Having a reference to blkg under an rcu allows accesses to only values
+ * local to groups like group stats and group rate limits.
+ */
+void __blkg_release_rcu(struct rcu_head *rcu_head)
{
+ struct blkcg_gq *blkg = container_of(rcu_head, struct blkcg_gq, rcu_head);
int i;
/* tell policies that this one is being freed */
@@ -388,21 +392,15 @@ void __blkg_release(struct blkcg_gq *blkg)
/* release the blkcg and parent blkg refs this blkg has been holding */
css_put(&blkg->blkcg->css);
- if (blkg->parent)
+ if (blkg->parent) {
+ spin_lock_irq(blkg->q->queue_lock);
blkg_put(blkg->parent);
+ spin_unlock_irq(blkg->q->queue_lock);
+ }
- /*
- * A group is freed in rcu manner. But having an rcu lock does not
- * mean that one can access all the fields of blkg and assume these
- * are valid. For example, don't try to follow throtl_data and
- * request queue links.
- *
- * Having a reference to blkg under an rcu allows acess to only
- * values local to groups like group stats and group rate limits
- */
- call_rcu(&blkg->rcu_head, blkg_rcu_free);
+ blkg_free(blkg);
}
-EXPORT_SYMBOL_GPL(__blkg_release);
+EXPORT_SYMBOL_GPL(__blkg_release_rcu);
/*
* The next function used by blk_queue_for_each_rl(). It's a bit tricky