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Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 78a3d5c0968e..166b5141f3d4 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4400,8 +4400,8 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
*/
int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
{
- int i;
struct cgroup_subsys_state *css;
+ int i, ret;
/* check name and function validity */
if (ss->name == NULL || strlen(ss->name) > MAX_CGROUP_TYPE_NAMELEN ||
@@ -4452,15 +4452,9 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
init_cgroup_css(css, ss, dummytop);
/* init_idr must be after init_cgroup_css because it sets css->id. */
if (ss->use_id) {
- int ret = cgroup_init_idr(ss, css);
- if (ret) {
- 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;
- }
+ ret = cgroup_init_idr(ss, css);
+ if (ret)
+ goto err_unload;
}
/*
@@ -4498,6 +4492,12 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
/* success! */
mutex_unlock(&cgroup_mutex);
return 0;
+
+err_unload:
+ mutex_unlock(&cgroup_mutex);
+ /* @ss can't be mounted here as try_module_get() would fail */
+ cgroup_unload_subsys(ss);
+ return ret;
}
EXPORT_SYMBOL_GPL(cgroup_load_subsys);
@@ -4548,7 +4548,6 @@ void cgroup_unload_subsys(struct cgroup_subsys *ss)
struct css_set *cg = link->cg;
hlist_del(&cg->hlist);
- BUG_ON(!cg->subsys[ss->subsys_id]);
cg->subsys[ss->subsys_id] = NULL;
hhead = css_set_hash(cg->subsys);
hlist_add_head(&cg->hlist, hhead);