linux-kernel - Re: cpufreq_stats NULL deref on second system suspend

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Message-ID: <523169E1.60304@linux.vnet.ibm.com>
Date:	Thu, 12 Sep 2013 12:44:41 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	cpufreq <cpufreq@...r.kernel.org>
Subject: Re: cpufreq_stats NULL deref on second system suspend

On 09/12/2013 12:22 PM, Viresh Kumar wrote:
> On 12 September 2013 12:16, Srivatsa S. Bhat
> <srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>> Of course, if we change the suspend/resume sequence and that fixes this, that
>> would be like getting it for free, nobody would say no to it ;-)
> 
> Not really :)
> 
> Policy with 4 CPUs, 0,1,2,3, policy->cpu currently set to 1, 2 or 3...
> 
> We will remove CPUs in order 3,2,1 and add back in 1,2,3... Or Vice Versa
> 
> policy->cpu after resume is 0 :)
> 

Ah, great counter-example! :-)

Regards,
Srivatsa S. Bhat

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