linux-kernel - Re: "cpufreq: fix serialization issues with freq change notifiers" breaks cpufreq too

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Message-ID: <CAKohponZ+FnzqXYMbBzbun0-1iQMi2fS4syrEBC_MdF41vLCeA@mail.gmail.com>
Date:	Tue, 10 Sep 2013 16:59:29 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Greg KH <greg@...ah.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	SH-Linux <linux-sh@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: "cpufreq: fix serialization issues with freq change notifiers"
 breaks cpufreq too

On 9 September 2013 20:41, Guennadi Liakhovetski <g.liakhovetski@....de> wrote:
> Sorry guys, I'm trying my best to stop this patch from propagating to
> stable and to get it fixed asap, so, the CC list might be a bit excessive.
> Also trying to fix the originally spare cc list, which makes it impossible
> for me to reply to the original thread, instead have to start a new one.
>
> Commit
>
> commit dceff5ce18801dddc220d6238628619c93bc3cb6
> Author: Viresh Kumar <viresh.kumar@...aro.org>
> Date:   Sun Sep 1 22:19:37 2013 +0530
>
>     cpufreq: fix serialization issues with freq change notifiers
>
> breaks .transition_ongoing counting. This leads to cpufreq-cpu0 not
> working any more. In particular switching the governor from performance to
> powersave directly after boot doesn't result in a frequency switch any
> more. Reverting this patch fixes the problem again. Tested with today's
> -next.

I have tested it again on my exynos and intel machines and couldn't see
a single problem with this patch..

I am afraid you need to give us some more information on how it broke
your stuff.. :)

And I am also not sure cpufreq-cpu0 is different then any other driver..

--
viresh
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