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Re: [Xen-devel] [PATCH v2] cpufreq: only stop ondemand governor if already started

>>> On 09.08.17 at 21:38, <christopher.w.clark@xxxxxxxxx> wrote:
> On CPUFREQ_GOV_STOP in cpufreq_governor_dbs, shortcut to
> return success if the governor is already stopped.
> Avoid executing dbs_timer_exit, to prevent tripping an assertion
> within a call to kill_timer on a timer that has not been prepared
> with init_timer, if the CPUFREQ_GOV_START case has not
> run beforehand.
> kill_timer validates timer state:
>  * itself, via BUG_ON(this_cpu(timers).running == timer);
>  * within active_timer, ASSERTing timer->status is within bounds;
>  * within list_del, which ASSERTs timer inactive list membership.
> Patch is synonymous to an OpenXT patch produced at Citrix prior to
> June 2014.
> Signed-off-by: Christopher Clark <christopher.clark6@xxxxxxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

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