Commit 80a6a2cf authored by Li Zefan's avatar Li Zefan Committed by Linus Torvalds

freezer_cg: remove redundant check in freezer_can_attach()

It is sufficient to check if @task is frozen, and no need to check if the
original freezer is frozen.
Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Acked-by: default avatarCedric Le Goater <clg@fr.ibm.com>
Acked-by: default avatarMatt Helsley <matthltc@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7ccb9743
......@@ -162,9 +162,13 @@ static int freezer_can_attach(struct cgroup_subsys *ss,
struct task_struct *task)
{
struct freezer *freezer;
int retval;
/* Anything frozen can't move or be moved to/from */
/*
* Anything frozen can't move or be moved to/from.
*
* Since orig_freezer->state == FROZEN means that @task has been
* frozen, so it's sufficient to check the latter condition.
*/
if (is_task_frozen_enough(task))
return -EBUSY;
......@@ -173,13 +177,7 @@ static int freezer_can_attach(struct cgroup_subsys *ss,
if (freezer->state == CGROUP_FROZEN)
return -EBUSY;
retval = 0;
task_lock(task);
freezer = task_freezer(task);
if (freezer->state == CGROUP_FROZEN)
retval = -EBUSY;
task_unlock(task);
return retval;
return 0;
}
static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task)
......
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