On Thu, 30 Aug 2012, Aaron Lu wrote: > Add a new flag may_power_off for scsi device, it gives the user a chance > to control when the device is runtime suspended, can we remove its power > if possible. > > I'm planning using this flag for sr and sd. > > For sr, if user set 0 to may_power_off, we will disable runtime suspend > for ODD, since runtime suspend for ODD is wholly for zero power ODD, if > we can't power off the ODD, there is no meaning to do runtime PM on it.
This doesn't seem like a good idea. Even though you may not be able to reduce the drive's power usage, you can still allow the runtime_suspend routine to succeed. This will tell the kernel to consider the drive as being in a suspended (and therefore unusable) state, allowing the kernel to do a runtime suspend of the SCSI host that the drive is attached to. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
