linux-kernel - [PATCH 39/93] cpuidle: coupled: disable interrupts after entering safe state

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Date:	Fri, 20 Sep 2013 13:08:34 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Colin Cross <ccross@...roid.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 39/93] cpuidle: coupled: disable interrupts after entering safe state

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

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

From: Colin Cross <ccross@...roid.com>

commit 59e998561103a93f294c8d3138dd659af772a5da upstream.

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.

Tested-by: Stephen Warren <swarren@...dia.com>
Signed-off-by: Colin Cross <ccross@...roid.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/cpuidle/coupled.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c
index dc9e647..5d39627 100644
--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -470,6 +470,7 @@ 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 */
@@ -514,6 +515,7 @@ retry:
 
 		entered_state = cpuidle_enter_state(dev, drv,
 			dev->safe_state_index);
+		local_irq_disable();
 	}
 
 	if (cpuidle_coupled_clear_pokes(dev->cpu)) {
-- 
1.8.1.2

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