Common i/o layer changes:
 - Allow ccw_device_halt() and ccw_device_clear() in state WAIT4IO.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>