2016-03-21 13:17 GMT+01:00 Pali Rohár <[email protected]>: > On Friday 18 March 2016 23:44:23 Gabriele Mazzotta wrote: >> +#ifdef CONFIG_PM_SLEEP >> +static void ACPI_SYSTEM_XFACE rbtn_acpi_clear_flag(void *context) >> +{ >> + struct rbtn_data *rbtn_data = context; >> + >> + rbtn_data->suspended = false; >> +} >> + >> +static int rbtn_suspend(struct device *dev) >> +{ >> + struct acpi_device *device = to_acpi_device(dev); >> + struct rbtn_data *rbtn_data = acpi_driver_data(device); >> + >> + rbtn_data->suspended = true; >> + >> + return 0; >> +} >> + >> +static int rbtn_resume(struct device *dev) >> +{ >> + struct acpi_device *device = to_acpi_device(dev); >> + struct rbtn_data *rbtn_data = acpi_driver_data(device); >> + acpi_status status; >> + >> + /* >> + * Clear the flag only after we received the extra >> + * ACPI notification. >> + */ >> + status = acpi_os_execute(OSL_NOTIFY_HANDLER, >> + rbtn_acpi_clear_flag, rbtn_data); >> + if (ACPI_FAILURE(status)) >> + rbtn_data->suspended = false; > > I case when acpi_os_execute success it calls rbtn_acpi_clear_flag, > right? And that will set suspended to false. When acpi_os_execute fails, > then it set suspended too to false... Then whole acpi_os_execute doing > just "barrier" after which suspended flag can be set to false. So I > think rbtn_acpi_clear_flag function is not needed here. > > Cannot you pass NULL or empty function pointer as callback? Or what was > reason to do that flag clearing at "two places"?
acpi_os_execute doesn't wait for the callback to be executed, so I can't clear the flag from rbtn_resume. >> + return 0; >> +} >> +#endif > > -- > Pali Rohár > [email protected]
