diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 71c1997a0f73..275ea865bc29 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -692,6 +692,9 @@ static int hci_uart_register_dev(struct hci_uart *hu)
 
 	if (hci_register_dev(hdev) < 0) {
 		BT_ERR("Can't register HCI device");
+		percpu_down_write(&hu->proto_lock);
+		clear_bit(HCI_UART_PROTO_INIT, &hu->flags);
+		percpu_up_write(&hu->proto_lock);
 		hu->proto->close(hu);
 		hu->hdev = NULL;
 		hci_free_dev(hdev);