This is a rerun of as278, updated to match the current source.  It changes
the hub driver, replacing calls to synchronous usb_unlink_urb() with
usb_kill_urb() and removing the machinery formerly needed to synchronize
the status URB handler with the rest of the driver.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>