I have a couple of small changes to suggest. Nothing major.
On Thu, 11 Oct 2012, Aaron Lu wrote:
> @@ -102,26 +77,87 @@ static int scsi_bus_prepare(struct device *dev)
>
> static int scsi_bus_suspend(struct device *dev)
> {
> - return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
> + int err = 0;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> +
> + if (scsi_is_sdev_device(dev)) {
> + /*
> + * sd is the only high-level SCSI driver to implement runtime
> + * PM, and sd treats runtime suspend, system suspend, and
> + * system hibernate identically.
> + */
It would be better if we don't refer to sd specifically. The comment
could be changed to something like this:
/*
* All the high-level SCSI drivers that implement runtime PM
* treat runtime suspend, system suspend, and system
* hibernate identically.
*/
> static int scsi_bus_freeze(struct device *dev)
> {
> - return scsi_bus_suspend_common(dev, PMSG_FREEZE);
> + int err = 0;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> +
> + if (scsi_is_sdev_device(dev)) {
> + /* wake up device so that FREEZE will succeed */
> + if (pm_runtime_suspended(dev))
> + pm_runtime_resume(dev);
I'm not sure why this is here. If none of the high-level drivers
implement FREEZE then it's not needed.
> static int scsi_bus_poweroff(struct device *dev)
> {
> - return scsi_bus_suspend_common(dev, PMSG_HIBERNATE);
> + int err = 0;
> + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> +
> + if (scsi_is_sdev_device(dev)) {
> + /*
> + * sd is the only high-level SCSI driver to implement runtime
> + * PM, and sd treats runtime suspend, system suspend, and
> + * system hibernate identically.
> + */
Same change as above for this comment.
Alan Stern
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