usb_root_hub_lost_power — called by HCD if the root hub lost Vbus power
|struct usb_device * rhdev|
The USB host controller driver calls this function when its root hub
is resumed and Vbus power has been interrupted or the controller
has been reset. The routine marks
rhdev as having lost power.
When the hub driver is resumed it will take notice and carry out
power-session recovery for all the “USB-PERSIST”-enabled child devices;
the others will be disconnected.