On Tuesday 17 July 2012 15:00:08 Alan Stern wrote: > Furthermore, what happens if you power down a port when the attached > device is active (not suspended)? Again it will look like a physical > disconnect. So again, you don't want to power off such ports -- even > though they don't have remote wakeup enabled. > > I guess this comes down to deciding how much power you want to give the > user. Are you saying that the user should be prevented from powering > down a port unless: > > there is no device attached, or > > the attached device is suspended with wakeup disabled? > > But the justification seems weak. If powering down a port looks > exactly like a disconnect, then you should allow powering down to the > same extent that you allow disconnects. Last time I checked, the > kernel did not try to prevent users from unplugging their USB devices. But it does not claim that a device is still present after that. An attempt to use it returns an error. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
