linux-kernel - Re: [PATCH 08/13] cpufreq: omap: call CPUFREQ

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Date:	Wed, 19 Jun 2013 10:44:54 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
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 08/13] cpufreq: omap: call CPUFREQ_POSTCHANGE notfier
 in error cases

On Wednesday 19 June 2013 04:53 AM, 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.
> 
> Omap driver was taking care of it well, but wasn't restoring freqs.new to
> freqs.old in some cases. I wasn't required to add code for it as moving
> PRECHANGE notifier down was a better option, so that we call it just before
> starting frequency transition.
> 
> Cca: Santosh Shilimkar <santosh.shilimkar@...com>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
Looks safe to me.
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>


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