Afaics the use of __wait_event_interruptible() as opposed to
wait_event_interruptible() is purely historic.  So let's follow the rest
of the kernel and check the condition before prepare_to_wait() - and
also make the code a bit nicer.
Signed-off-by: NJoern Engel <joern@logfs.org>
Acked-by: NDouglas Gilbert <dgilbert@interlog.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>