cgroup: allow ->post_create() to fail
There could be cases where controllers want to do initialization
operations which may fail from ->post_create(). This patch makes
->post_create() return -errno to indicate failure and online_css()
relay such failures.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Glauber Costa <glommer@parallels.com>
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 670a4af..ee8bb67 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -112,7 +112,7 @@
* parent's freezing state while holding both parent's and our
* freezer->lock.
*/
-static void freezer_post_create(struct cgroup *cgroup)
+static int freezer_post_create(struct cgroup *cgroup)
{
struct freezer *freezer = cgroup_freezer(cgroup);
struct freezer *parent = parent_freezer(freezer);
@@ -136,6 +136,8 @@
spin_unlock(&freezer->lock);
if (parent)
spin_unlock_irq(&parent->lock);
+
+ return 0;
}
/**