[PATCH] cpuidle: mvebu: Fix the CPU PM notifier usage
Gregory CLEMENT
gregory.clement at free-electrons.com
Fri Feb 27 01:39:29 PST 2015
Hi Rafael,
On 26/02/2015 22:55, Rafael J. Wysocki wrote:
> On Thursday, February 26, 2015 06:20:48 PM Gregory CLEMENT wrote:
>> 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>
>
> Should that go to "stable" too? Which "stable" series it should go to if so?
Yes as it fixes a potential issue, you're right it should go
to "stable". The bug was here since the introduction of the driver
in 3.16.
Thanks,
Gregory
>
>> ---
>> drivers/cpuidle/cpuidle-mvebu-v7.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/cpuidle/cpuidle-mvebu-v7.c b/drivers/cpuidle/cpuidle-mvebu-v7.c
>> index 38e68618513a..cefa07438ae1 100644
>> --- a/drivers/cpuidle/cpuidle-mvebu-v7.c
>> +++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
>> @@ -37,11 +37,11 @@ static int mvebu_v7_enter_idle(struct cpuidle_device *dev,
>> deepidle = true;
>>
>> ret = mvebu_v7_cpu_suspend(deepidle);
>> + cpu_pm_exit();
>> +
>> if (ret)
>> return ret;
>>
>> - cpu_pm_exit();
>> -
>> return index;
>> }
>>
>>
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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