Re: [PATCH V2 Resend 37/92] cpufreq: acpi: don't initialize part of policy that is set by core too

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On 11/10/2013, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> On Thursday, October 03, 2013 08:28:31 PM Viresh Kumar wrote:
>> Many common initializations of struct policy are moved to core now and
>> hence
>> this driver doesn't need to do it. This patch removes such code.
>>
>> Most recent of those changes is to call ->get() in the core after calling
>> ->init().
>>
>> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
>> ---
>>  drivers/cpufreq/acpi-cpufreq.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/cpufreq/acpi-cpufreq.c
>> b/drivers/cpufreq/acpi-cpufreq.c
>> index 94a5a1d..a8dac7b 100644
>> --- a/drivers/cpufreq/acpi-cpufreq.c
>> +++ b/drivers/cpufreq/acpi-cpufreq.c
>> @@ -842,7 +842,6 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy
>> *policy)
>>  		break;
>>  	case ACPI_ADR_SPACE_FIXED_HARDWARE:
>>  		acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
>> -		policy->cur = get_cur_freq_on_cpu(cpu);
>>  		break;
>>  	default:
>>  		break;
>
> I'm wondering what happens if space_id is ACPI_ADR_SPACE_SYSTEM_IO?  I
> suppose
> that the core will set policy->cur first and then it will be overwritten
> here?

No. First ->init() is called and then core sets policy->cur. And it sets
it only if there is a valid ->get() available.. Which wouldn't be available
in case of ACPI_ADR_SPACE_SYSTEM_IO..
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