linux-kernel - Re: [PATCH 05/13] cpufreq: e_powersave: call CPUFREQ

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Date:	Wed, 19 Jun 2013 21:22:02 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	rjw@...k.pl, linaro-kernel@...ts.linaro.org, patches@...aro.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, arvind.chauhan@....com,
	dave.martin@....com
Subject: Re: [PATCH 05/13] cpufreq: e_powersave: call CPUFREQ_POSTCHANGE
 notfier in error cases

On Wed, Jun 19, 2013 at 02:22:59PM +0530, Viresh Kumar wrote:
> PRECHANGE and POSTCHANGE notifiers must be called in groups, i.e either both
> should be called or both shouldn't be.
> 
> In case we have started PRECHANGE notifier and found an error, we must call
> POSTCHANGE notifier with freqs.new = freqs.old to guarantee that sequence of
> calling notifiers is complete.
> 
> This driver was taking care of it but frequency isn't restored to freqs.old.
> 
> This patch fixes it.
> 
> Cc: Simon Horman <horms@...ge.net.au>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

I have no objections to this change but at the same time I don't
feel that I know the code well enough to review it.

> ---
>  drivers/cpufreq/e_powersaver.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
> index 37380fb..3d03626 100644
> --- a/drivers/cpufreq/e_powersaver.c
> +++ b/drivers/cpufreq/e_powersaver.c
> @@ -161,6 +161,9 @@ postchange:
>  		current_multiplier);
>  	}
>  #endif
> +	if (err)
> +		freqs.new = freqs.old;
> +
>  	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
>  	return err;
>  }
> -- 
> 1.7.12.rc2.18.g61b472e
> 
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