This patch takes some code that was only used in one place in the hub
driver, and packages it up into a subroutine which is now called from
several places.  The routine does a logical disconnect -- for example,
after issuing a port reset, if the device descriptors have changed
(because of a firmware update perhaps) we logically disconnect the old
device structure and create a new one.  Or if a resume fails for any
reason we can do the same thing.

This touches some of David Brownell's suspend/resume code, obviously.
(It also fixes a couple of small errors in there.)  He has said it looks
okay.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>