cgroup: add css_parent()

[linux-2.6-block.git] / kernel / cgroup_freezer.c

diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 1db686e47a22a24eafe322e4249bbd983aeef76a..657a73cd44c4003de917e951069617a699b8e732 100644 (file)
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -62,11 +62,7 @@ static inline struct freezer *task_freezer(struct task_struct *task)
 
 static struct freezer *parent_freezer(struct freezer *freezer)
 {
-       struct cgroup *pcg = freezer->css.cgroup->parent;
-
-       if (pcg)
-               return cgroup_freezer(pcg);
-       return NULL;
+       return css_freezer(css_parent(&freezer->css));
 }
 
 bool cgroup_freezing(struct task_struct *task)
@@ -234,7 +230,7 @@ static void freezer_fork(struct task_struct *task)
         * The root cgroup is non-freezable, so we can skip the
         * following check.
         */
-       if (!freezer->css.cgroup->parent)
+       if (!parent_freezer(freezer))
                goto out;
 
        spin_lock_irq(&freezer->lock);