linux-kernel - Re: [PATCH] cpufreq_stats: fix race between stats allocation and first usage

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Message-ID: <2504655.pJNUDF76QM@vostro.rjw.lan>
Date:	Sat, 15 Dec 2012 12:22:38 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org, cpufreq <cpufreq@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] cpufreq_stats: fix race between stats allocation and first usage

On Saturday, December 15, 2012 11:01:49 AM Konstantin Khlebnikov wrote:
> Rafael J. Wysocki wrote:
> > On Friday, December 14, 2012 02:59:21 PM Konstantin Khlebnikov wrote:
> >> This patch forces complete struct cpufreq_stats allocation for all cpus before
> >> registering CPUFREQ_TRANSITION_NOTIFIER notifier, otherwise in some conditions
> >> cpufreq_stat_notifier_trans() can be called in the middle of stats allocation,
> >> in this case cpufreq_stats_table already exists, but stat->freq_table is NULL.
> >
> > I'll queue it up for submission as v3.8 material.
> >
> > Does it need to be marked as -stable material too?
> 
> It's very old and rare bug. I think you can leave it as is.

OK

Thanks,
Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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