This power state change is communicated by the device controller to {TAIL ~ a device driver} in response to {HEAD ~ the device removal signal} 
This power state change is communicated by the device controller to { TAIL ~ a device driver } in response to { HEAD ~ the device removal signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD