diff -urpN --exclude-from=/home/davej/.exclude bk-linus/drivers/char/tty_io.c linux-2.5/drivers/char/tty_io.c
--- bk-linus/drivers/char/tty_io.c	2002-11-21 02:14:02.000000000 +0000
+++ linux-2.5/drivers/char/tty_io.c	2002-11-21 17:57:48.000000000 +0000
@@ -1660,6 +1660,21 @@ static int send_break(struct tty_struct 
 	return 0;
 }
 
+static int tty_generic_brk(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	if (cmd == TCSBRK && arg) 
+	{
+		/* tcdrain case */
+		int retval = tty_check_change(tty);
+		if (retval)
+			return retval;
+		tty_wait_until_sent(tty, 0);
+		if (signal_pending(current))
+			return -EINTR;
+	}
+	return 0;
+}
+
 /*
  * Split this up, as gcc can choke on it otherwise..
  */
@@ -1693,11 +1708,12 @@ int tty_ioctl(struct inode * inode, stru
 		/* the driver doesn't support them. */
 		case TCSBRK:
 		case TCSBRKP:
-			if (!tty->driver.ioctl)
-				return 0;
-			retval = tty->driver.ioctl(tty, file, cmd, arg);
+			retval = -ENOIOCTLCMD;
+			if (tty->driver.ioctl)
+				retval = tty->driver.ioctl(tty, file, cmd, arg);
+			/* Not driver handled */
 			if (retval == -ENOIOCTLCMD)
-				retval = 0;
+				retval = tty_generic_brk(tty, file, cmd, arg);
 			return retval;
 		}
 	}