On Friday, August 23, 2013 12:45:10 PM Colin Cross wrote:
> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Colin Cross <ccross@xxxxxxxxxxx>
I've queued up all thress for 3.12, but I wonder what stable versions they
should be included into? All of them or just a subset?
Rafael
> ---
> 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)) {
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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