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

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Message-ID: <CAKohpokEc1vZacN2X+8_cY8DF1wehSE6yaZ5-SQbqtt5qUUW_A@mail.gmail.com>
Date:	Fri, 13 Sep 2013 09:56:18 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"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 12 September 2013 22:56, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> On 09/12/2013 09:25 PM, Stephen Warren wrote:
> Anyway, nevermind, as of now, subsystems do work around this suitably, so
> there is no known bug as such at the present. Just that we could have probably
> done it a better way, that's all.

Yeah, there is no bug as of now due to the number of hacks adopted by different
framework.. I believe we can still have a cleanup series to take care
of this stuff..
That would be some improvement and would be better for future.. Otherwise
this kind of problems would keep coming again and again..

> You're absolutely right! Regular CPU hotplug is more demanding than
> suspend/resume in the context we are discussing, since any CPU can be
> hotplugged at any time and put back in any order. So code like cpufreq should
> be prepared to work with any ordering.

And that part is well implemented and tested as far as I know..
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