1 files changed, 10 insertions, 16 deletions

diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index e7bebb7c6c38..e691818d7e45 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -160,7 +160,7 @@ static void freezer_destroy(struct cgroup_subsys *ss,
  */
 static int freezer_can_attach(struct cgroup_subsys *ss,
                               struct cgroup *new_cgroup,
-                              struct task_struct *task, bool threadgroup)
+                              struct task_struct *task)
 {
         struct freezer *freezer;
 
@@ -172,26 +172,17 @@ static int freezer_can_attach(struct cgroup_subsys *ss,
         if (freezer->state != CGROUP_THAWED)
                 return -EBUSY;
 
+        return 0;
+}
+
+static int freezer_can_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
+{
         rcu_read_lock();
-        if (__cgroup_freezing_or_frozen(task)) {
+        if (__cgroup_freezing_or_frozen(tsk)) {
                 rcu_read_unlock();
                 return -EBUSY;
         }
         rcu_read_unlock();
-
-        if (threadgroup) {
-                struct task_struct *c;
-
-                rcu_read_lock();
-                list_for_each_entry_rcu(c, &task->thread_group, thread_group) {
-                        if (__cgroup_freezing_or_frozen(c)) {
-                                rcu_read_unlock();
-                                return -EBUSY;
-                        }
-                }
-                rcu_read_unlock();
-        }
-
         return 0;
 }
 
@@ -390,6 +381,9 @@ struct cgroup_subsys freezer_subsys = {
         .populate       = freezer_populate,
         .subsys_id      = freezer_subsys_id,
         .can_attach     = freezer_can_attach,
+        .can_attach_task = freezer_can_attach_task,
+        .pre_attach     = NULL,
+        .attach_task    = NULL,
         .attach         = NULL,
         .fork           = freezer_fork,
         .exit           = NULL,