On 09/27/2012 10:42 PM, Alan Stern wrote:
> On Thu, 27 Sep 2012, Aaron Lu wrote:
>
>>> Moreover, I'd like to migrate SCSI drivers to the PM handling based on
>>> struct
>>> dev_pm_ops eventually and your change is kind of going in the opposite
>>> direction. I don't know how much effort the migration is going to take,
>>> though, so perhaps we can just make this change first.
>>
>> Does the following change look OK?
>>
>> diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
>> index dc0ad85..1fb7ccc 100644
>> --- a/drivers/scsi/scsi_pm.c
>> +++ b/drivers/scsi/scsi_pm.c
>> @@ -143,7 +143,15 @@ static int scsi_runtime_suspend(struct device *dev)
>>
>> dev_dbg(dev, "scsi_runtime_suspend\n");
>> if (scsi_is_sdev_device(dev)) {
>> - err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND);
>> + err = scsi_device_quiesce(to_scsi_device(dev));
>> + if (err)
>> + goto out;
>> +
>> + err = pm_generic_runtime_suspend(dev);
>> + if (!err)
>> + goto out;
>> +
>> + scsi_device_resume(to_scsi_device(dev));
>> if (err == -EAGAIN)
>> pm_schedule_suspend(dev, jiffies_to_msecs(
>> round_jiffies_up_relative(HZ/10)));
>
> Maybe in the end it will be better, but for now this looks like
> unnecessary code duplication. Basically you are copying
> scsi_dev_type_suspend() into scsi_runtime_suspend(), except that you
> omitted the debugging statement.
And I've used pm_generic_runtime_suspend :-)
That would allow me to write runtime callbacks of dev_pm_ops for
indivisual scsi drivers, like sr.
Thanks,
Aaron
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