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-rw-r--r--mm/memcontrol.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 04a97bce2270..102ab48ffa13 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6183,17 +6183,15 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
* automatically removed on cgroup destruction but the removal is
* asynchronous, so take an extra ref on @css.
*/
- rcu_read_lock();
-
+ cfile_css = css_tryget_from_dir(cfile.file->f_dentry->d_parent,
+ &memory_cgrp_subsys);
ret = -EINVAL;
- cfile_css = css_from_dir(cfile.file->f_dentry->d_parent,
- &memory_cgrp_subsys);
- if (cfile_css == css && css_tryget(css))
- ret = 0;
-
- rcu_read_unlock();
- if (ret)
+ if (IS_ERR(cfile_css))
goto out_put_cfile;
+ if (cfile_css != css) {
+ css_put(cfile_css);
+ goto out_put_cfile;
+ }
ret = event->register_event(memcg, event->eventfd, buffer);
if (ret)