Fix async internal loopback by not using enable_loopback function which
reprograms clocking and should only be used for hdlc mode.
Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>