linux-kernel - [PATCH 4.4 45/67] ARM: cpuidle: Pass on arm_cpuidle

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Message-Id: <20160509071839.502392937@linuxfoundation.org>
Date:	Mon,  9 May 2016 09:18:50 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, James Morse <james.morse@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.4 45/67] ARM: cpuidle: Pass on arm_cpuidle_suspend()s return value

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

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

From: James Morse <james.morse@....com>

commit 625fe4f8ffc1b915248558481bb94249f6bd411c upstream.

arm_cpuidle_suspend() may return -EOPNOTSUPP, or any value returned
by the cpu_ops/cpuidle_ops suspend call. arm_enter_idle_state() doesn't
update 'ret' with this value, meaning we always signal success to
cpuidle_enter_state(), causing it to update the usage counters as if we
succeeded.

Fixes: 191de17aa3c1 ("ARM64: cpuidle: Replace cpu_suspend by the common ARM/ARM64 function")
Signed-off-by: James Morse <james.morse@....com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/cpuidle/cpuidle-arm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cpuidle/cpuidle-arm.c
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -50,7 +50,7 @@ static int arm_enter_idle_state(struct c
 		 * call the CPU ops suspend protocol with idle index as a
 		 * parameter.
 		 */
-		arm_cpuidle_suspend(idx);
+		ret = arm_cpuidle_suspend(idx);

 		cpu_pm_exit();
 	}