This patch contains changes to usbcore making the core responsible for
deallocating memory for usb_hcd structures, rather than calling back into
the host controller drivers.  This solves a long-standing oops, since the
drivers may have been unloaded from memory by the time the release routine
is called.  (There probably are some Bugzilla entries caused by this, but
I don't know which ones.)

To really fix this up properly will require merging the HCD "glue" layer
into the higher core structures.  As things stand now, a usb_hcd contains
a usb_bus member, and the usb_bus is associated with a class_device: when
the class_device is released the usb_hcd gets deallocated.  It's awkward
in that neither the usb_hcd nor the usb_bus has its own reference count,
and the class_device is created when the bus is registered (not when it is
initialized).
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>