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authorTejun Heo <tj@kernel.org>2012-11-19 08:13:36 -0800
committerTejun Heo <tj@kernel.org>2012-11-19 08:13:36 -0800
commit648bb56d076bde31113f09a7d24d95bc8d4155ac (patch)
tree5e17d543a77f3783e4cfce7f525f4c3255238c07 /kernel/cgroup.c
parentb48c6a80a0f7584056f768268fc12b87745a393f (diff)
cgroup: lock cgroup_mutex in cgroup_init_subsys()
Make cgroup_init_subsys() grab cgroup_mutex while initializing a subsystem so that all helpers and callbacks are called under the context they expect. This isn't strictly necessary as cgroup_init_subsys() doesn't race with anybody but will allow adding lockdep assertions. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 6cc693b91c4..09751657abd 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4317,6 +4317,8 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
printk(KERN_INFO "Initializing cgroup subsys %s\n", ss->name);
+ mutex_lock(&cgroup_mutex);
+
/* init base cftset */
cgroup_init_cftsets(ss);
@@ -4346,6 +4348,8 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
if (ss->post_create)
ss->post_create(dummytop);
+ mutex_unlock(&cgroup_mutex);
+
/* this function shouldn't be used with modular subsystems, since they
* need to register a subsys_id, among other things */
BUG_ON(ss->module);