[PATCH 1/9] ACPI / PM: Let acpi_dev_pm_detach() return an error code

[Ulf Hansson]

On 27 August 2014 02:16, Rafael J. Wysocki <rjw at rjwysocki.net> wrote:
> On Tuesday, August 26, 2014 02:07:09 PM Ulf Hansson wrote:
>> To give callers the option of acting on a errors while removing the
>> pm_domain ops for the device in the ACPI power domain, let
>> acpi_dev_pm_detach() return an int to provide the error code.
>>
>> Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
>> ---
>>  drivers/acpi/device_pm.c | 4 ++++
>>  include/linux/acpi.h     | 7 +++++--
>>  2 files changed, 9 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
>> index 67075f8..fa78abb 100644
>> --- a/drivers/acpi/device_pm.c
>> +++ b/drivers/acpi/device_pm.c
>> @@ -1087,6 +1087,8 @@ EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
>>   *
>>   * Callers must ensure proper synchronization of this function with power
>>   * management callbacks.
>> + *
>> + * Returns 0 on successfully detached power domain or negative error code.
>
> "PM domain" here, please, not "power domain".
>

Sure.

If you prefer that term, I can also change on the other patches in
this patchset. There are commit-msg etc , where I think I have used
"power domain".

>>   */
>>  void acpi_dev_pm_detach(struct device *dev, bool power_off)
>
> It looks like you've never compiled this, have you?

You are absolutely right. There were quite some combinations of
CONFIG_PM_* that I tried out, but I totally forgot ACPI, sorry! I will
make sure to do it in v2.

>
>>  {
>> @@ -1107,7 +1109,9 @@ void acpi_dev_pm_detach(struct device *dev, bool power_off)
>>                       acpi_device_wakeup(adev, ACPI_STATE_S0, false);
>>                       acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
>>               }
>> +             return 0;
>>       }
>> +     return -ENODEV;
>
> -EINVAL perhaps?

Sure!

>
>>  }
>>  EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);
>>  #endif /* CONFIG_PM */
>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>> index 5320153..a7bfdf6 100644
>> --- a/include/linux/acpi.h
>> +++ b/include/linux/acpi.h
>> @@ -576,7 +576,7 @@ static inline int acpi_subsys_freeze(struct device *dev) { return 0; }
>>  #if defined(CONFIG_ACPI) && defined(CONFIG_PM)
>>  struct acpi_device *acpi_dev_pm_get_node(struct device *dev);
>>  int acpi_dev_pm_attach(struct device *dev, bool power_on);
>> -void acpi_dev_pm_detach(struct device *dev, bool power_off);
>> +int acpi_dev_pm_detach(struct device *dev, bool power_off);
>>  #else
>>  static inline struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
>>  {
>> @@ -586,7 +586,10 @@ static inline int acpi_dev_pm_attach(struct device *dev, bool power_on)
>>  {
>>       return -ENODEV;
>>  }
>> -static inline void acpi_dev_pm_detach(struct device *dev, bool power_off) {}
>> +static inline int acpi_dev_pm_detach(struct device *dev, bool power_off)
>> +{
>> +     return -ENODEV;
>> +}
>>  #endif
>>
>>  #ifdef CONFIG_ACPI
>>
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.

Thanks for reviewing!

Kind regards
Uffe