From 05d943288256fd4e947e53227abd390ad71a50ea Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Mon, 19 Nov 2012 08:13:37 -0800
Subject: [PATCH] --- yaml --- r: 339339 b: refs/heads/master c:
 02ae7486d05ae6df8395409a4945b2420f1e35c2 h: refs/heads/master i:   339337:
 cc0a1d56709eb15210de139a3549c3a25d9c0797   339335:
 09f0aa179a503ed0cde20a9eb802f49669646977 v: v3

---
 [refs]                |  2 +-
 trunk/kernel/cgroup.c | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 7e1c12dbd711..a32b449f5b26 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 648bb56d076bde31113f09a7d24d95bc8d4155ac
+refs/heads/master: 02ae7486d05ae6df8395409a4945b2420f1e35c2
diff --git a/trunk/kernel/cgroup.c b/trunk/kernel/cgroup.c
index 09751657abdc..5679cb1ce43f 100644
--- a/trunk/kernel/cgroup.c
+++ b/trunk/kernel/cgroup.c
@@ -4420,9 +4420,10 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
 	if (ss->use_id) {
 		int ret = cgroup_init_idr(ss, css);
 		if (ret) {
-			dummytop->subsys[ss->subsys_id] = NULL;
 			ss->destroy(dummytop);
+			dummytop->subsys[ss->subsys_id] = NULL;
 			subsys[ss->subsys_id] = NULL;
+			list_del_init(&ss->sibling);
 			mutex_unlock(&cgroup_mutex);
 			return ret;
 		}
@@ -4490,7 +4491,19 @@ void cgroup_unload_subsys(struct cgroup_subsys *ss)
 	 */
 	BUG_ON(ss->root != &rootnode);
 
+	/* ->pre_destroy() should be called outside cgroup_mutex for now */
+	if (ss->pre_destroy)
+		ss->pre_destroy(dummytop);
+
 	mutex_lock(&cgroup_mutex);
+
+	ss->active = 0;
+
+	if (ss->use_id) {
+		idr_remove_all(&ss->idr);
+		idr_destroy(&ss->idr);
+	}
+
 	/* deassign the subsys_id */
 	subsys[ss->subsys_id] = NULL;