mm, sl[aou]b: Move kmem_cache_create mutex handling to common code

[platform/adaptation/renesas_rcar/renesas_kernel.git] / kernel / cgroup.c

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a0c6af3..0f3527d 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5132,7 +5132,7 @@ EXPORT_SYMBOL_GPL(css_depth);
  * @root: the css supporsed to be an ancestor of the child.
  *
  * Returns true if "root" is an ancestor of "child" in its hierarchy. Because
- * this function reads css->id, this use rcu_dereference() and rcu_read_lock().
+ * this function reads css->id, the caller must hold rcu_read_lock().
  * But, considering usual usage, the csses should be valid objects after test.
  * Assuming that the caller will do some action to the child if this returns
  * returns true, the caller must take "child";s reference count.
@@ -5144,18 +5144,18 @@ bool css_is_ancestor(struct cgroup_subsys_state *child,
 {
        struct css_id *child_id;
        struct css_id *root_id;
-       bool ret = true;
 
-       rcu_read_lock();
        child_id  = rcu_dereference(child->id);
+       if (!child_id)
+               return false;
        root_id = rcu_dereference(root->id);
-       if (!child_id
-           || !root_id
-           || (child_id->depth < root_id->depth)
-           || (child_id->stack[root_id->depth] != root_id->id))
-               ret = false;
-       rcu_read_unlock();
-       return ret;
+       if (!root_id)
+               return false;
+       if (child_id->depth < root_id->depth)
+               return false;
+       if (child_id->stack[root_id->depth] != root_id->id)
+               return false;
+       return true;
 }
 
 void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)