diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index f6ce2c5fbe5b9c8ccd88e68ec2a0b7764faeed5c..6afca98fae21654e73a1275886ed7832cef0fe66 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1391,9 +1391,7 @@ static int tty_reopen(struct tty_struct *tty)
 	}
 	tty->count++;
 
-	mutex_lock(&tty->ldisc_mutex);
 	WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
-	mutex_unlock(&tty->ldisc_mutex);
 
 	return 0;
 }