Bluetooth: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/bcm203x.c

@@ -106,7 +106,7 @@ static void bcm203x_complete(struct urb *urb)
 		}
 
 		data->state = BCM203X_LOAD_FIRMWARE;
-		/* fall through */
+		fallthrough;
 	case BCM203X_LOAD_FIRMWARE:
 		if (data->fw_sent == data->fw_size) {
 			usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, BCM203X_IN_EP),

drivers/bluetooth/bluecard_cs.c

@@ -295,7 +295,6 @@ static void bluecard_write_wakeup(struct bluecard_info *info)
 				baud_reg = REG_CONTROL_BAUD_RATE_115200;
 				break;
 			case PKT_BAUD_RATE_57600:
-				/* Fall through... */
 			default:
 				baud_reg = REG_CONTROL_BAUD_RATE_57600;
 				break;
@@ -585,7 +584,6 @@ static int bluecard_hci_set_baud_rate(struct hci_dev *hdev, int baud)
 		hci_skb_pkt_type(skb) = PKT_BAUD_RATE_115200;
 		break;
 	case 57600:
-		/* Fall through... */
 	default:
 		cmd[4] = 0x03;
 		hci_skb_pkt_type(skb) = PKT_BAUD_RATE_57600;

drivers/bluetooth/hci_ll.c

@@ -219,7 +219,7 @@ static void ll_device_want_to_wakeup(struct hci_uart *hu)
 		 * perfectly safe to always send one.
 		 */
 		BT_DBG("dual wake-up-indication");
-		/* fall through */
+		fallthrough;
 	case HCILL_ASLEEP:
 		/* acknowledge device wake up */
 		if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {

drivers/bluetooth/hci_qca.c

@@ -472,8 +472,6 @@ static void hci_ibs_tx_idle_timeout(struct timer_list *t)
 
 	case HCI_IBS_TX_ASLEEP:
 	case HCI_IBS_TX_WAKING:
-		/* Fall through */
-
 	default:
 		BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 		break;
@@ -516,8 +514,6 @@ static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
 
 	case HCI_IBS_TX_ASLEEP:
 	case HCI_IBS_TX_AWAKE:
-		/* Fall through */
-
 	default:
 		BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
 		break;
@@ -835,8 +831,6 @@ static void device_woke_up(struct hci_uart *hu)
 		break;
 
 	case HCI_IBS_TX_ASLEEP:
-		/* Fall through */
-
 	default:
 		BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
 		       qca->tx_ibs_state);
@@ -2072,7 +2066,7 @@ static int __maybe_unused qca_suspend(struct device *dev)
 	switch (qca->tx_ibs_state) {
 	case HCI_IBS_TX_WAKING:
 		del_timer(&qca->wake_retrans_timer);
-		/* Fall through */
+		fallthrough;
 	case HCI_IBS_TX_AWAKE:
 		del_timer(&qca->tx_idle_timer);