called by HCD to resume its root hub
void usb_hcd_resume_root_hub (
|struct usb_hcd * hcd|
host controller for this root hub
The USB host controller calls this function when its root hub is
suspended (with the remote wakeup feature enabled) and a remote
wakeup request is received. The routine submits a workqueue request
to resume the root hub (that is, manage its downstream ports again).