write_unlock(&css_set_lock);
ret = online_css(css);
- if (ret)
+ if (ret) {
+ ss->css_free(css);
goto err_unload;
+ }
/* success! */
mutex_unlock(&cgroup_root_mutex);
void cgroup_unload_subsys(struct cgroup_subsys *ss)
{
struct cgrp_cset_link *link;
+ struct cgroup_subsys_state *css;
BUG_ON(ss->module == NULL);
mutex_lock(&cgroup_mutex);
mutex_lock(&cgroup_root_mutex);
- offline_css(cgroup_css(cgroup_dummy_top, ss));
+ css = cgroup_css(cgroup_dummy_top, ss);
+ if (css)
+ offline_css(css);
/* deassign the subsys_id */
cgroup_subsys[ss->subsys_id] = NULL;
* need to free before marking as null because ss->css_free needs
* the cgrp->subsys pointer to find their state.
*/
- ss->css_free(cgroup_css(cgroup_dummy_top, ss));
+ if (css)
+ ss->css_free(css);
RCU_INIT_POINTER(cgroup_dummy_top->subsys[ss->subsys_id], NULL);
mutex_unlock(&cgroup_root_mutex);