From 9d9f1f43f61757df9067f0fa0131732fdeec0b27 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 13 Dec 2011 21:42:19 +0100
Subject: [PATCH 097/365] sched: ttwu: Return success when only changing the
 saved_state value

When a task blocks on a rt lock, it saves the current state in
p->saved_state, so a lock related wake up will not destroy the
original state.

When a real wakeup happens, while the task is running due to a lock
wakeup already, we update p->saved_state to TASK_RUNNING, but we do
not return success, which might cause another wakeup in the waitqueue
code and the task remains in the waitqueue list. Return success in
that case as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/sched/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3f6480f59ddc..d3d0a852e35c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1968,8 +1968,10 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
 		 * if the wakeup condition is true.
 		 */
 		if (!(wake_flags & WF_LOCK_SLEEPER)) {
-			if (p->saved_state & state)
+			if (p->saved_state & state) {
 				p->saved_state = TASK_RUNNING;
+				success = 1;
+			}
 		}
 		goto out;
 	}
-- 
2.10.2

