Bluetooth: use inclusive language when tracking connections

This patch replaces some non-inclusive terms based on the appropriate
language mapping table compiled by the Bluetooth SIG:
https://specificationrefs.bluetooth.com/language-mapping/Appropriate_Language_Mapping_Table.pdf

Specifically, these terms are replaced:
master -> central
slave  -> peripheral
Signed-off-by: NArchie Pusaka <apusaka@chromium.org>
Reviewed-by: NMiao-chen Chou <mcchou@chromium.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci_core.h

@@ -122,7 +122,7 @@ struct hci_conn_hash {
 	unsigned int     amp_num;
 	unsigned int     sco_num;
 	unsigned int     le_num;
-	unsigned int     le_num_slave;
+	unsigned int     le_num_peripheral;
 };
 
 struct bdaddr_list {
@@ -894,7 +894,7 @@ static inline void hci_conn_hash_add(struct hci_dev *hdev, struct hci_conn *c)
 	case LE_LINK:
 		h->le_num++;
 		if (c->role == HCI_ROLE_SLAVE)
-			h->le_num_slave++;
+			h->le_num_peripheral++;
 		break;
 	case SCO_LINK:
 	case ESCO_LINK:
@@ -920,7 +920,7 @@ static inline void hci_conn_hash_del(struct hci_dev *hdev, struct hci_conn *c)
 	case LE_LINK:
 		h->le_num--;
 		if (c->role == HCI_ROLE_SLAVE)
-			h->le_num_slave--;
+			h->le_num_peripheral--;
 		break;
 	case SCO_LINK:
 	case ESCO_LINK:

net/bluetooth/hci_event.c

@@ -5384,9 +5384,9 @@ static struct hci_conn *check_pending_le_conn(struct hci_dev *hdev,
 		return NULL;
 
 	/* Most controller will fail if we try to create new connections
-	 * while we have an existing one in slave role.
+	 * while we have an existing one in peripheral role.
 	 */
-	if (hdev->conn_hash.le_num_slave > 0 &&
+	if (hdev->conn_hash.le_num_peripheral > 0 &&
 	    (!test_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks) ||
 	     !(hdev->le_states[3] & 0x10)))
 		return NULL;

net/bluetooth/hci_request.c

@@ -1519,13 +1519,14 @@ static bool is_advertising_allowed(struct hci_dev *hdev, bool connectable)
 	if (hci_conn_num(hdev, LE_LINK) == 0)
 		return true;
 
-	/* Check le_states if there is any connection in slave role. */
-	if (hdev->conn_hash.le_num_slave > 0) {
-		/* Slave connection state and non connectable mode bit 20. */
+	/* Check le_states if there is any connection in peripheral role. */
+	if (hdev->conn_hash.le_num_peripheral > 0) {
+		/* Peripheral connection state and non connectable mode bit 20.
+		 */
 		if (!connectable && !(hdev->le_states[2] & 0x10))
 			return false;
 
-		/* Slave connection state and connectable mode bit 38
+		/* Peripheral connection state and connectable mode bit 38
 		 * and scannable bit 21.
 		 */
 		if (connectable && (!(hdev->le_states[4] & 0x40) ||
@@ -1533,13 +1534,13 @@ static bool is_advertising_allowed(struct hci_dev *hdev, bool connectable)
 			return false;
 	}
 
-	/* Check le_states if there is any connection in master role. */
-	if (hci_conn_num(hdev, LE_LINK) != hdev->conn_hash.le_num_slave) {
-		/* Master connection state and non connectable mode bit 18. */
+	/* Check le_states if there is any connection in central role. */
+	if (hci_conn_num(hdev, LE_LINK) != hdev->conn_hash.le_num_peripheral) {
+		/* Central connection state and non connectable mode bit 18. */
 		if (!connectable && !(hdev->le_states[2] & 0x02))
 			return false;
 
-		/* Master connection state and connectable mode bit 35 and
+		/* Central connection state and connectable mode bit 35 and
 		 * scannable 19.
 		 */
 		if (connectable && (!(hdev->le_states[4] & 0x08) ||