Re: [RFT][PATCH 0/3] cpufreq / PM: QoS: Introduce frequency QoS and use it in cpufreq

[Viresh Kumar]

On 16-10-19, 15:23, Sudeep Holla wrote:
> Thanks for the spinning these patches so quickly.
> 
> I did give it a spin, but unfortunately it doesn't fix the bug I reported.
> So I looked at my bug report in detail and looks like the cpufreq_driver
> variable is set to NULL at that point and it fails to dereference it
> while trying to execute:
> 	ret = cpufreq_driver->verify(new_policy);
> (Hint verify is at offset 0x1c/28)
> 
> So I suspect some race as this platform with bL switcher tries to
> unregister and re-register the cpufreq driver during the boot.
> 
> I need to spend more time on this as reverting the initial PM QoS patch
> to cpufreq.c makes the issue disappear.

Is this easily reproducible ? cpufreq_driver == NULL shouldn't be the case, it
get updated only once while registering/unregistering cpufreq drivers. That is
the last thing which can go wrong from my point of view :)

-- 
viresh