--- a/drivers/bluetooth/hci_ldisc.c
+++ h/drivers/bluetooth/hci_ldisc.c
@@ -767,7 +767,7 @@ static int hci_uart_tty_ioctl(struct tty
 		break;
 
 	case HCIUARTGETPROTO:
-		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+		if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
 			err = hu->proto->id;
 		else
 			err = -EUNATCH;