summaryrefslogtreecommitdiffstats
path: root/kernel/cgroup.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 75c0ff00aca6..33a2f63d4a10 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -61,7 +61,6 @@
#include <linux/cpuset.h>
#include <linux/proc_ns.h>
#include <linux/nsproxy.h>
-#include <linux/proc_ns.h>
#include <net/sock.h>
/*
@@ -1160,18 +1159,12 @@ static void cgroup_exit_root_id(struct cgroup_root *root)
{
lockdep_assert_held(&cgroup_mutex);
- if (root->hierarchy_id) {
- idr_remove(&cgroup_hierarchy_idr, root->hierarchy_id);
- root->hierarchy_id = 0;
- }
+ idr_remove(&cgroup_hierarchy_idr, root->hierarchy_id);
}
static void cgroup_free_root(struct cgroup_root *root)
{
if (root) {
- /* hierarchy ID should already have been released */
- WARN_ON_ONCE(root->hierarchy_id);
-
idr_destroy(&root->cgroup_idr);
kfree(root);
}
@@ -5146,6 +5139,8 @@ static struct cgroup_subsys_state *css_create(struct cgroup *cgrp,
lockdep_assert_held(&cgroup_mutex);
css = ss->css_alloc(parent_css);
+ if (!css)
+ css = ERR_PTR(-ENOMEM);
if (IS_ERR(css))
return css;
@@ -6172,7 +6167,7 @@ struct cgroup_subsys_state *css_tryget_online_from_dir(struct dentry *dentry,
struct cgroup_subsys_state *css_from_id(int id, struct cgroup_subsys *ss)
{
WARN_ON_ONCE(!rcu_read_lock_held());
- return id > 0 ? idr_find(&ss->css_idr, id) : NULL;
+ return idr_find(&ss->css_idr, id);
}
/**