--- 2.5/drivers/char/n_tty.c	2003-07-05 09:13:01.000000000 +0200
+++ build-2.5/drivers/char/n_tty.c	2003-07-27 20:44:58.000000000 +0200
@@ -1251,7 +1251,8 @@
 		else
 			tty->minimum_to_wake = 1;
 	}
-	if (tty->driver->chars_in_buffer(tty) < WAKEUP_CHARS)
+	if (tty->driver->chars_in_buffer(tty) < WAKEUP_CHARS &&
+			tty->driver->write_room(tty) > 0)
 		mask |= POLLOUT | POLLWRNORM;
 	return mask;
 }