This patch implements the missing functionality necessary to get device
resets working fully.  It adds a bit-array of ports with logical
connect-changes pending to the hub structure, so that the hub driver can
recognize that these ports should be treated as though they had
disconnected and re-connected.  This is how we will handle devices that
"morph" (i.e., change their descriptors) following a reset, as might
happen with a firmware upload.

There is also a lot of additional kerneldoc and a few small changes to
some log messages.  An important restriction is that usb_reset_device()
will refuse to work if the device is suspended.  Trying to reset a
suspended device leads to several problems, not least of which is that the
device's parent hub might be suspended as well.

With this patch the device reset code is pretty much complete.  However it
won't always work correctly until the device locking is straightened out.
That's coming up next.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>