linux-kernel - Re: [PATCH 4/5] cpufreq, policy->initialized count must be atomic

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Message-ID: <CAKohpokHSY1qqSq=D0FZK3Px1c-Ro8nVbD+dBqUNSPWUXiiiJQ@mail.gmail.com>
Date:	Tue, 11 Nov 2014 09:25:38 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Robert Schöne <robert.schoene@...dresden.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 4/5] cpufreq, policy->initialized count must be atomic

On 5 November 2014 20:23, Prarit Bhargava <prarit@...hat.com> wrote:
> The policy->initialized value can be modified from several cpus concurrently if
> !CPUFREQ_HAVE_GOVERNOR_PER_POLICY.  This leads to a situation where a
> governor maybe switched out even though the governor->initialized is greater
> than one.  It must be switched to atomic_t and protected with a mutex to
> make sure that future read/writes obtain the correct data.

Can you show a sequence of events to demonstrate the race you are talking
about? As far as I can see, there are no races :)
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