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Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 38b136553044..31e9ef319070 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2954,11 +2954,8 @@ struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
WARN_ON_ONCE(!rcu_read_lock_held());
/* if first iteration, pretend we just visited @cgroup */
- if (!pos) {
- if (list_empty(&cgroup->children))
- return NULL;
+ if (!pos)
pos = cgroup;
- }
/* visit the first child if exists */
next = list_first_or_null_rcu(&pos->children, struct cgroup, sibling);
@@ -2966,14 +2963,14 @@ struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
return next;
/* no child, visit my or the closest ancestor's next sibling */
- do {
+ while (pos != cgroup) {
next = list_entry_rcu(pos->sibling.next, struct cgroup,
sibling);
if (&next->sibling != &pos->parent->children)
return next;
pos = pos->parent;
- } while (pos != cgroup);
+ }
return NULL;
}