Re: [PATCH v2 6/10] cpufreq: Support for fast frequency switching

[Steve Muckle]

On 03/04/2016 02:58 PM, Rafael J. Wysocki wrote:
>>> How about modifying cpufreq_register_notifier to return an error if the
>>> >> driver has a fast_switch callback installed and an attempt to register a
>>> >> transition notifier is made?
>> >
>> > That sounds like a good idea.
>
> Transition notifiers may be registered before the driver is
> registered, so that won't help in all cases.

Could that hole be closed by a similar check in
cpufreq_register_driver()? I.e. if the transition_notifier list is not
empty, fail to register the driver (if the driver has a fast_switch
routine)?

Or alternatively, the fast_switch routine is not installed.

thanks,
Steve