linux-kernel - [PATCH 1/3] cpuidle: coupled: disable interrupts after entering safe state

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Date:	Fri, 23 Aug 2013 12:45:10 -0700
From:	Colin Cross <ccross@...roid.com>
To:	linux-pm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Neil Zhang <zhangwm@...vell.com>,
	Joseph Lo <josephl@...dia.com>, linux-tegra@...r.kernel.org,
	Colin Cross <ccross@...roid.com>, stable@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [PATCH 1/3] cpuidle: coupled: disable interrupts after entering safe state

Calling cpuidle_enter_state is expected to return with interrupts
enabled, but interrupts must be disabled before starting the
ready loop synchronization stage.  Call local_irq_disable after
each call to cpuidle_enter_state for the safe state.

CC: stable@...r.kernel.org
Signed-off-by: Colin Cross <ccross@...roid.com>
---
 drivers/cpuidle/coupled.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c
index 2a297f8..db92bcb 100644
--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -460,6 +460,7 @@ int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
 		}
 		entered_state = cpuidle_enter_state(dev, drv,
 			dev->safe_state_index);
+		local_irq_disable();
 	}
 
 	/* Read barrier ensures online_count is read after prevent is cleared */
@@ -485,6 +486,7 @@ retry:
 
 		entered_state = cpuidle_enter_state(dev, drv,
 			dev->safe_state_index);
+		local_irq_disable();
 	}
 
 	if (cpuidle_coupled_clear_pokes(dev->cpu)) {
-- 
1.8.3

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