linux-kernel - Re: Regression on cpufreq in v3.12-rc1

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Message-ID: <CACRpkdYoNkgno24dtJAwOq2T9yoKQYgKQ+adfkSN8affYNePjQ@mail.gmail.com>
Date:	Fri, 20 Sep 2013 10:41:01 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Regression on cpufreq in v3.12-rc1

On Fri, Sep 20, 2013 at 10:39 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 20 September 2013 14:03, Linus Walleij <linus.walleij@...aro.org> wrote:
>> I suspect this hunk from the patch may be the cause:
>>
>> +       if (cpufreq_driver) {
>> +               /* get the CPU */
>> +               policy = per_cpu(cpufreq_cpu_data, cpu);
>> +               if (policy)
>> +                       kobject_get(&policy->kobj);
>> +       }
>>
>> -       /* get the CPU */
>> -       policy = per_cpu(cpufreq_cpu_data, cpu);
>>
>> As you see we *always* set a policy pointer before this patch,
>> but after this patch we only do it if we have a cpufreq driver
>> registered!
>
> Not really!! See this few lines above:
>
> -       if (!cpufreq_driver)
> -               goto err_out_unlock;

Hm that's true...

Any other idea why this patch is causing the issue?

It's not the same patch pointed out by Srivatsa...

Yours,
Linus Walleij
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