From 15c53c1419407ca516f31fcc945e93cf6b174666 Mon Sep 17 00:00:00 2001
From: Matt Helsley <matthltc@us.ibm.com>
Date: Fri, 26 Mar 2010 23:51:44 +0100
Subject: [PATCH] --- yaml --- r: 189389 b: refs/heads/master c:
 5a7aadfe2fcb0f69e2acc1fbefe22a096e792fc9 h: refs/heads/master i:   189387:
 cef550543b71285cde060438c7a7920f464216f7 v: v3

---
 [refs]                        | 2 +-
 trunk/include/linux/freezer.h | 7 +++++--
 trunk/kernel/cgroup_freezer.c | 9 ++++++---
 trunk/kernel/power/process.c  | 2 +-
 4 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/[refs] b/[refs]
index d22cf98fa845..969b9f8ccc2d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4f598458ea4450f53e8ed929ee4e66b3404a7286
+refs/heads/master: 5a7aadfe2fcb0f69e2acc1fbefe22a096e792fc9
diff --git a/trunk/include/linux/freezer.h b/trunk/include/linux/freezer.h
index 5a361f85cfec..da7e52b099f3 100644
--- a/trunk/include/linux/freezer.h
+++ b/trunk/include/linux/freezer.h
@@ -64,9 +64,12 @@ extern bool freeze_task(struct task_struct *p, bool sig_only);
 extern void cancel_freezing(struct task_struct *p);
 
 #ifdef CONFIG_CGROUP_FREEZER
-extern int cgroup_frozen(struct task_struct *task);
+extern int cgroup_freezing_or_frozen(struct task_struct *task);
 #else /* !CONFIG_CGROUP_FREEZER */
-static inline int cgroup_frozen(struct task_struct *task) { return 0; }
+static inline int cgroup_freezing_or_frozen(struct task_struct *task)
+{
+	return 0;
+}
 #endif /* !CONFIG_CGROUP_FREEZER */
 
 /*
diff --git a/trunk/kernel/cgroup_freezer.c b/trunk/kernel/cgroup_freezer.c
index 59e9ef6aab40..eb3f34d57419 100644
--- a/trunk/kernel/cgroup_freezer.c
+++ b/trunk/kernel/cgroup_freezer.c
@@ -47,17 +47,20 @@ static inline struct freezer *task_freezer(struct task_struct *task)
 			    struct freezer, css);
 }
 
-int cgroup_frozen(struct task_struct *task)
+int cgroup_freezing_or_frozen(struct task_struct *task)
 {
 	struct freezer *freezer;
 	enum freezer_state state;
 
 	task_lock(task);
 	freezer = task_freezer(task);
-	state = freezer->state;
+	if (!freezer->css.cgroup->parent)
+		state = CGROUP_THAWED; /* root cgroup can't be frozen */
+	else
+		state = freezer->state;
 	task_unlock(task);
 
-	return state == CGROUP_FROZEN;
+	return (state == CGROUP_FREEZING) || (state == CGROUP_FROZEN);
 }
 
 /*
diff --git a/trunk/kernel/power/process.c b/trunk/kernel/power/process.c
index a0480cd4daaf..71ae29052ab6 100644
--- a/trunk/kernel/power/process.c
+++ b/trunk/kernel/power/process.c
@@ -144,7 +144,7 @@ static void thaw_tasks(bool nosig_only)
 		if (nosig_only && should_send_signal(p))
 			continue;
 
-		if (cgroup_frozen(p))
+		if (cgroup_freezing_or_frozen(p))
 			continue;
 
 		thaw_process(p);