1 files changed, 2 insertions, 9 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 0eb7b868e1ab..3edf7163b84f 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2763,10 +2763,7 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
          */
         update_before = cgroup_serial_nr_next;
 
-        mutex_unlock(&cgroup_mutex);
-
         /* add/rm files for all cgroups created before */
-        rcu_read_lock();
         css_for_each_descendant_pre(css, cgroup_css(root, ss)) {
                 struct cgroup *cgrp = css->cgroup;
 
@@ -2775,23 +2772,19 @@ static int cgroup_cfts_commit(struct cftype *cfts, bool is_add)
 
                 inode = cgrp->dentry->d_inode;
                 dget(cgrp->dentry);
-                rcu_read_unlock();
-
                 dput(prev);
                 prev = cgrp->dentry;
 
+                mutex_unlock(&cgroup_mutex);
                 mutex_lock(&inode->i_mutex);
                 mutex_lock(&cgroup_mutex);
                 if (cgrp->serial_nr < update_before && !cgroup_is_dead(cgrp))
                         ret = cgroup_addrm_files(cgrp, cfts, is_add);
-                mutex_unlock(&cgroup_mutex);
                 mutex_unlock(&inode->i_mutex);
-
-                rcu_read_lock();
                 if (ret)
                         break;
         }
-        rcu_read_unlock();
+        mutex_unlock(&cgroup_mutex);
         dput(prev);
         deactivate_super(sb);
         return ret;