linux-kernel - Re: [PATCH] clockevents: check 'state' instead of 'mode' in suspend/resume path

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Date:	Thu, 18 Jun 2015 16:26:09 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	sylvain.rochet@...secur.com
Subject: Re: [PATCH] clockevents: check 'state' instead of 'mode' in
 suspend/resume path

On 17/06/2015 at 16:04:46 +0530, Viresh Kumar wrote :
> CLOCK_EVT_MODE_* macros are present for backward compatibility (as most
> of the drivers are still using old ->set_mode() interface).
> 
> These macro's shouldn't be used anymore in code, that is common to both
> driver interfaces, i.e. ->set_mode() and ->set_state_*().
> 
> Drivers implementing ->set_state_*() interface, which have their
> clkevt->mode set to 0 (clkevt device structures are normally globally
> defined), will not participate in suspend/resume as they will always be
> marked as UNUSED.
> 
> Fix this by checking state of the clockevent device instead of mode,
> which is updated for both the interfaces.
> 
> Fixes: ac34ad27fc16 ("clockevents: Do not suspend/resume if unused")
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Reviewed-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

> ---
>  kernel/time/clockevents.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
> index 2397b97320d8..08ccc3da3ca0 100644
> --- a/kernel/time/clockevents.c
> +++ b/kernel/time/clockevents.c
> @@ -639,7 +639,7 @@ void clockevents_suspend(void)
>  	struct clock_event_device *dev;
>  
>  	list_for_each_entry_reverse(dev, &clockevent_devices, list)
> -		if (dev->suspend && dev->mode != CLOCK_EVT_MODE_UNUSED)
> +		if (dev->suspend && !clockevent_state_detached(dev))
>  			dev->suspend(dev);
>  }
>  
> @@ -651,7 +651,7 @@ void clockevents_resume(void)
>  	struct clock_event_device *dev;
>  
>  	list_for_each_entry(dev, &clockevent_devices, list)
> -		if (dev->resume && dev->mode != CLOCK_EVT_MODE_UNUSED)
> +		if (dev->resume && !clockevent_state_detached(dev))
>  			dev->resume(dev);
>  }
>  
> -- 
> 2.4.0
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
--
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