include/linux/freezer.h |    4 ++++
 kernel/power/process.c  |   14 +++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

Index: linux-2.6.20-mm2/include/linux/freezer.h
===================================================================
--- linux-2.6.20-mm2.orig/include/linux/freezer.h
+++ linux-2.6.20-mm2/include/linux/freezer.h
@@ -40,11 +40,15 @@ static inline void do_not_freeze(struct 
  */
 static inline int thaw_process(struct task_struct *p)
 {
+	task_lock(p);
 	if (frozen(p)) {
 		p->flags &= ~PF_FROZEN;
+		task_unlock(p);
 		wake_up_process(p);
 		return 1;
 	}
+	clear_tsk_thread_flag(p, TIF_FREEZE);
+	task_unlock(p);
 	return 0;
 }
 
Index: linux-2.6.20-mm2/kernel/power/process.c
===================================================================
--- linux-2.6.20-mm2.orig/kernel/power/process.c
+++ linux-2.6.20-mm2/kernel/power/process.c
@@ -39,10 +39,18 @@ void refrigerator(void)
 	/* Hmm, should we be allowed to suspend when there are realtime
 	   processes around? */
 	long save;
+
+	task_lock(current);
+	if (freezing(current)) {
+		frozen_process(current);
+		task_unlock(current);
+	} else {
+		task_unlock(current);
+		return;
+	}
 	save = current->state;
 	pr_debug("%s entered refrigerator\n", current->comm);
 
-	frozen_process(current);
 	spin_lock_irq(&current->sighand->siglock);
 	recalc_sigpending(); /* We sent fake signal, clean it up */
 	spin_unlock_irq(&current->sighand->siglock);
@@ -79,12 +87,16 @@ static void cancel_freezing(struct task_
 {
 	unsigned long flags;
 
+	task_lock(p);
 	if (freezing(p)) {
 		pr_debug("  clean up: %s\n", p->comm);
 		do_not_freeze(p);
+		task_unlock(p);
 		spin_lock_irqsave(&p->sighand->siglock, flags);
 		recalc_sigpending_tsk(p);
 		spin_unlock_irqrestore(&p->sighand->siglock, flags);
+	} else {
+		task_unlock(p);
 	}
 }