Re: [PATCH v3 5/5] thermal: cpu_cooling: update the cpu device when cpufreq updates the policy cpu
From: Kapileshwar Singh
Date: Tue Mar 03 2015 - 10:35:06 EST
On 03/03/15 15:29, Viresh Kumar wrote:
> On 3 March 2015 at 20:39, Kapileshwar Singh <kapileshwar.singh@xxxxxxx> wrote:
>
>> I did test this but we were working with the assumption that OPPs should be populated for all the CPUs and also that OPPs are lost for a hotplugged CPU which I see is not the case.
>
> Then what did you test? My point here is, even with the latest patches
> that you have
> sent, you wouldn't be able to get the OPPs once policy->cpu goes down. So, how
> did this worked for you ?
We were basing our fix on possibility of having OPPs for all the CPUs and we incorrectly attributed the erroneous OPP we got from dev_pm_opp_find_freq_exact to the missing OPPs in the other CPUs.
>
>> We have looked at this more closely and found that problem lies in:
>>
>> freq = cpufreq_quick_get(cpumask_any(&cpufreq_device->allowed_cpus));
>>
>> which returns a NULL frequency as we are not checking for online CPUs here. We shall come up with a fix for this. Many thanks for helping us with the investigation.
>
> Right.
>
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