diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 3f68e213df1f70853ee19480a522ecaaaf420e33..d80e9d4c974b4f94dcef36963f03c4c7b1ff020b 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -545,6 +545,12 @@ int tty_set_ldisc(struct tty_struct *tty, int disc)
 		goto out;
 	}
 
+	if (tty->ops->ldisc_ok) {
+		retval = tty->ops->ldisc_ok(tty, disc);
+		if (retval)
+			goto out;
+	}
+
 	old_ldisc = tty->ldisc;
 
 	/* Shutdown the old discipline. */
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index e66ff9c11dade9cd4263ddaacbdd0d15adbb31e3..a22da757ca6d1822f01f4e9243ca55d488f30132 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -3390,6 +3390,15 @@ static void con_cleanup(struct tty_struct *tty)
 	tty_port_put(&vc->port);
 }
 
+/*
+ * We can't deal with anything but the N_TTY ldisc,
+ * because we can sleep in our write() routine.
+ */
+static int con_ldisc_ok(struct tty_struct *tty, int ldisc)
+{
+	return ldisc == N_TTY ? 0 : -EINVAL;
+}
+
 static int default_color           = 7; /* white */
 static int default_italic_color    = 2; // green (ASCII)
 static int default_underline_color = 3; // cyan (ASCII)
@@ -3509,6 +3518,7 @@ static const struct tty_operations con_ops = {
 	.resize = vt_resize,
 	.shutdown = con_shutdown,
 	.cleanup = con_cleanup,
+	.ldisc_ok = con_ldisc_ok,
 };
 
 static struct cdev vc0_cdev;
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index e4883dcf1656b14b819a46414920079e36881757..aaaab5095d7cbe745c69e07e950f406c786e55aa 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -156,6 +156,13 @@ struct serial_struct;
  *
  *	Optional. Called under the @tty->termios_rwsem. May sleep.
  *
+ * @ldisc_ok: ``int ()(struct tty_struct *tty, int ldisc)``
+ *
+ *	This routine allows the @tty driver to decide if it can deal
+ *	with a particular @ldisc.
+ *
+ *	Optional. Called under the @tty->ldisc_sem and @tty->termios_rwsem.
+ *
  * @set_ldisc: ``void ()(struct tty_struct *tty)``
  *
  *	This routine allows the @tty driver to be notified when the device's
@@ -392,7 +399,7 @@ struct tty_operations {
 	void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
 #endif
 	int (*proc_show)(struct seq_file *m, void *driver);
-	KABI_RESERVE(0)
+	KABI_USE(0, int (*ldisc_ok)(struct tty_struct *tty, int ldisc))
 	KABI_RESERVE(1)
 } __randomize_layout;