[PATCH] serial send_break duration fix

Fix tty_io.c send_break() to assert break for proper duration.  If driver
break_ctl() changes task state, then break may end prematurely.  USB serial
driver break_ctl() sends a URB, changing task state to TASK_RUNNING.
Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/tty_io.c

@@ -2148,11 +2148,11 @@ static int tiocsetd(struct tty_struct *tty, int __user *p)
 
 static int send_break(struct tty_struct *tty, int duration)
 {
-	set_current_state(TASK_INTERRUPTIBLE);
-
 	tty->driver->break_ctl(tty, -1);
-	if (!signal_pending(current))
+	if (!signal_pending(current)) {
+		set_current_state(TASK_INTERRUPTIBLE);
 		schedule_timeout(duration);
+	}
 	tty->driver->break_ctl(tty, 0);
 	if (signal_pending(current))
 		return -EINTR;