USB_ROOT_HUB_LOST_PO(9)                   USB Core APIs                   USB_ROOT_HUB_LOST_PO(9)



NAME
       usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power

SYNOPSIS
       void usb_root_hub_lost_power(struct usb_device * rhdev);

ARGUMENTS
       rhdev
           struct usb_device for the root hub

DESCRIPTION
       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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   USB_ROOT_HUB_LOST_PO(9)