cgroup: remove redundant get/put of old css_set from migrate

We can now assume that the css_set reference held by the task
will not go away for an exiting task. PF_EXITING state can be
trusted throughout migration by checking it after locking
threadgroup.

Changes in V4:
* https://lkml.org/lkml/2011/12/20/368 (Tejun Heo)
  * Fix typo in commit message
  * Undid the rename of css_set_check_fetched
* https://lkml.org/lkml/2011/12/20/427 (Li Zefan)
  * Fix comment in cgroup_task_migrate()
Changes in V3:
* https://lkml.org/lkml/2011/12/20/255 (Frederic Weisbecker)
  * Fixed to put error in retval
Changes in V2:
* https://lkml.org/lkml/2011/12/19/289 (Tejun Heo)
  * Updated commit message

-tj: removed stale patch description about dropped function rename.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: containers@lists.linux-foundation.org
Cc: cgroups@vger.kernel.org
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul Menage <paul@paulmenage.org>

1 files changed, 8 insertions, 20 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 4936d8886b4f..82288088f6a5 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1850,14 +1850,12 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
         struct css_set *newcg;
 
         /*
-         * get old css_set. We are synchronized through threadgroup_lock()
-         * against PF_EXITING setting such that we can't race against
-         * cgroup_exit() changing the css_set to init_css_set and dropping the
-         * old one.
+         * We are synchronized through threadgroup_lock() against PF_EXITING
+         * setting such that we can't race against cgroup_exit() changing the
+         * css_set to init_css_set and dropping the old one.
          */
         WARN_ON_ONCE(tsk->flags & PF_EXITING);
         oldcg = tsk->cgroups;
-        get_css_set(oldcg);
 
         /* locate or allocate a new css_set for this task. */
         if (guarantee) {
@@ -1872,12 +1870,9 @@ static int cgroup_task_migrate(struct cgroup *cgrp, struct cgroup *oldcgrp,
                 might_sleep();
                 /* find_css_set will give us newcg already referenced. */
                 newcg = find_css_set(oldcg, cgrp);
-                if (!newcg) {
-                        put_css_set(oldcg);
+                if (!newcg)
                         return -ENOMEM;
-                }
         }
-        put_css_set(oldcg);
 
         task_lock(tsk);
         rcu_assign_pointer(tsk->cgroups, newcg);
@@ -2186,18 +2181,11 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
                  * init_css_set.
                  */
                 oldcg = tc->task->cgroups;
-                get_css_set(oldcg);
-                /* see if the new one for us is already in the list? */
-                if (css_set_check_fetched(cgrp, tc->task, oldcg, &newcg_list)) {
-                        /* was already there, nothing to do. */
-                        put_css_set(oldcg);
-                } else {
-                        /* we don't already have it. get new one. */
-                        retval = css_set_prefetch(cgrp, oldcg, &newcg_list);
-                        put_css_set(oldcg);
-                        if (retval)
+
+                /* if we don't already have it in the list get a new one */
+                if (!css_set_check_fetched(cgrp, tc->task, oldcg, &newcg_list))
+                        if (retval = css_set_prefetch(cgrp, oldcg, &newcg_list))
                                 goto out_list_teardown;
-                }
         }
 
         /*