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.
Alan Stern
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