diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index fe37ec331289b227a31e2c6b967660a2f68bf85f..43413040ec34fede98d56362131aca2882efabcc 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -578,6 +578,16 @@ int tty_set_ldisc(struct tty_struct *tty, int disc)
 		goto out;
 	}
 
+#ifdef CONFIG_VT
+	/*vt device use only n_tty ldisc*/
+	if (tty->ops->ioctl == vt_ioctl) {
+		if (disc != N_TTY) {
+			retval = -EINVAL;
+			goto out;
+		}
+	}
+#endif
+
 	old_ldisc = tty->ldisc;
 
 	/* Shutdown the old discipline. */