[BUG FIX] PM / cpu_domains: Check for NULL callbacks

[Lina Iyer]

On Thu, Feb 18 2016 at 10:46 -0700, Rafael J. Wysocki wrote:
>On Thu, Feb 18, 2016 at 6:29 PM, Lina Iyer <lina.iyer at linaro.org> wrote:
>> Check for NULL platform callback before calling.
>>
>> Signed-off-by: Lina Iyer <lina.iyer at linaro.org>
>> ---
>>  drivers/base/power/cpu_domains.c | 10 ++++++++--
>>  1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/base/power/cpu_domains.c b/drivers/base/power/cpu_domains.c
>> index 7069411..bcaa474 100644
>> --- a/drivers/base/power/cpu_domains.c
>> +++ b/drivers/base/power/cpu_domains.c
>> @@ -157,16 +157,22 @@ static int cpu_pd_power_on(struct generic_pm_domain *genpd)
>>  {
>>         struct cpu_pm_domain *pd = to_cpu_pd(genpd);
>>
>> -       return pd->ops.power_on();
>> +       if (pd->ops.power_on)
>> +               return pd->ops.power_on();
>> +
>> +       return 0;
>>  }
>
>I usually write things like that as
>
>return pd->ops.power_on ? pd->ops.power_on() : 0;
>
>That gets the job done in just one line of code instead of 4 and in
>one statement instead of 3.
>
Sure. Thanks. Will roll this in with the next submission.

Thanks,
Lina