linux-kernel - [PATCH 3.16.y-ckt 051/144] cpuidle: mvebu: Fix the CPU PM notifier usage

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Date:	Tue, 21 Apr 2015 16:30:36 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 051/144] cpuidle: mvebu: Fix the CPU PM notifier usage

3.16.7-ckt10 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gregory CLEMENT <gregory.clement@...e-electrons.com>

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@...ero.it>
Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.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@...onical.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;
 }
 
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