[PATCH 1/1] ARM: ux500:mach-ux500/cpuidle.c spinlock dis-matching

[steve.zhan]

Hi all,

Is this not bug?

steve.

2012/12/28, steve.zhan <zhanzhenbo at gmail.com>:
> Hi Daniel,
>
>        I think we must unlock the master spinlock even
> prcmu_gic_decouple function now always return 0.
>        Could you give some infos about this?
> Thanks.
>
> diff --git a/arch/arm/mach-ux500/cpuidle.c b/arch/arm/mach-ux500/cpuidle.c
> index b54884bd..b0759ce 100644
> --- a/arch/arm/mach-ux500/cpuidle.c
> +++ b/arch/arm/mach-ux500/cpuidle.c
> @@ -29,6 +29,7 @@ static inline int ux500_enter_idle(struct cpuidle_device
> *dev,
>  {
>         int this_cpu = smp_processor_id();
>         bool recouple = false;
> +       bool locked = false;
>
>         clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &this_cpu);
>
> @@ -39,6 +40,8 @@ static inline int ux500_enter_idle(struct cpuidle_device
> *dev,
>                 if (!spin_trylock(&master_lock))
>                         goto wfi;
>
> +               locked = true;
> +
>                 /* decouple the gic from the A9 cores */
>                 if (prcmu_gic_decouple())
>                         goto out;
> @@ -76,7 +79,7 @@ static inline int ux500_enter_idle(struct cpuidle_device
> *dev,
>                 /* When we switch to retention, the prcmu is in charge
>                  * of recoupling the gic automatically */
>                 recouple = false;
> -
> +               locked = false;
>                 spin_unlock(&master_lock);
>         }
>  wfi:
> @@ -86,7 +89,8 @@ out:
>
>         if (recouple) {
>                 prcmu_gic_recouple();
> -               spin_unlock(&master_lock);
> +               if (locked)
> +                       spin_unlock(&master_lock);
>         }
>
>         clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &this_cpu);
>
>
>
> Steve Zhan
>


-- 
Steve Zhan