[3.16.y-ckt stable] Patch "cpuidle: mvebu: Fix the CPU PM notifier usage" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    cpuidle: mvebu: Fix the CPU PM notifier usage

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt10.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 0816dd8989d18760eb86a991e5476c1b651743dc Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement at free-electrons.com>
Date: Thu, 26 Feb 2015 18:20:48 +0100
Subject: cpuidle: mvebu: Fix the CPU PM notifier usage

commit 43b68879de27b1993518687fbc6013da80cdcbfe upstream.

As stated in kernel/cpu_pm.c, "Platform is responsible for ensuring
that cpu_pm_enter is not called twice on the same CPU before
cpu_pm_exit is called.". In the current code in case of failure when
calling mvebu_v7_cpu_suspend, the function cpu_pm_exit() is never
called whereas cpu_pm_enter() was called just before.

This patch moves the cpu_pm_exit() in order to balance the
cpu_pm_enter() calls.

Reported-by: Fulvio Benini <fbf at libero.it>
Signed-off-by: Gregory CLEMENT <gregory.clement at free-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano at linaro.org>
[ luis: backported to 3.16:
  - file rename: cpuidle-mvebu-v7.c -> cpuidle-armada-370-xp.c
  - adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/cpuidle/cpuidle-armada-370-xp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-armada-370-xp.c b/drivers/cpuidle/cpuidle-armada-370-xp.c
index a5fba0287bfb..1a428b478a0d 100644
--- a/drivers/cpuidle/cpuidle-armada-370-xp.c
+++ b/drivers/cpuidle/cpuidle-armada-370-xp.c
@@ -38,11 +38,11 @@ static int armada_370_xp_enter_idle(struct cpuidle_device *dev,
 		deepidle = true;

 	ret = armada_370_xp_cpu_suspend(deepidle);
+	cpu_pm_exit();
+
 	if (ret)
 		return ret;

-	cpu_pm_exit();
-
 	return index;
 }