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Diffstat (limited to 'kernel/cgroup_freezer.c')
-rw-r--r--kernel/cgroup_freezer.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 224da9aa27f5..f0ff64d0ebaa 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -311,7 +311,6 @@ static int freezer_read(struct cgroup_subsys_state *css, struct cftype *cft,
/* update states bottom-up */
css_for_each_descendant_post(pos, css)
update_if_frozen(pos);
- update_if_frozen(css);
rcu_read_unlock();
@@ -391,11 +390,6 @@ static void freezer_change_state(struct freezer *freezer, bool freeze)
{
struct cgroup_subsys_state *pos;
- /* update @freezer */
- spin_lock_irq(&freezer->lock);
- freezer_apply_state(freezer, freeze, CGROUP_FREEZING_SELF);
- spin_unlock_irq(&freezer->lock);
-
/*
* Update all its descendants in pre-order traversal. Each
* descendant will try to inherit its parent's FREEZING state as
@@ -406,14 +400,23 @@ static void freezer_change_state(struct freezer *freezer, bool freeze)
struct freezer *pos_f = css_freezer(pos);
struct freezer *parent = parent_freezer(pos_f);
- /*
- * Our update to @parent->state is already visible which is
- * all we need. No need to lock @parent. For more info on
- * synchronization, see freezer_post_create().
- */
spin_lock_irq(&pos_f->lock);
- freezer_apply_state(pos_f, parent->state & CGROUP_FREEZING,
- CGROUP_FREEZING_PARENT);
+
+ if (pos_f == freezer) {
+ freezer_apply_state(pos_f, freeze,
+ CGROUP_FREEZING_SELF);
+ } else {
+ /*
+ * Our update to @parent->state is already visible
+ * which is all we need. No need to lock @parent.
+ * For more info on synchronization, see
+ * freezer_post_create().
+ */
+ freezer_apply_state(pos_f,
+ parent->state & CGROUP_FREEZING,
+ CGROUP_FREEZING_PARENT);
+ }
+
spin_unlock_irq(&pos_f->lock);
}
rcu_read_unlock();