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authorLi Zefan <lizf@cn.fujitsu.com>2008-10-29 22:00:52 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-30 19:38:45 +0100
commit80a6a2cf3bebcf20285cf05373b9c5ec96816577 (patch)
treeb934c6b9c55e7f0979312bdec9f679680d73aac1 /kernel/cgroup_freezer.c
parentfreezer_cg: fix improper BUG_ON() causing oops (diff)
downloadlinux-80a6a2cf3bebcf20285cf05373b9c5ec96816577.tar.xz
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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: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Cedric Le Goater <clg@fr.ibm.com> Acked-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cgroup_freezer.c')
-rw-r--r--kernel/cgroup_freezer.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 7f54d1c42953..e9c856a265c9 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -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)