This patch reintroduces the usb_lock_device_for_reset() routine, which
is specially tailored to meet the needs of drivers that have to reset a
device either during probe() or during normal operations.  It updates a
few drivers that do device resets, to make them use the new routine.  It
also adds a new field to struct usb_interface, to keep track of whether
the interface is in the process of being bound to or unbound from a
driver.  This is necessary, because during binding we know the device is
already locked so we don't want to try to acquire the lock again!

With this patch in place, USB device resets should finally become
reliable.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>