Bluetooth: ISO: Match QoS adv handle with BIG handle

In case the user binds multiple sockets for the same BIG, the BIG
handle should be matched with the associated adv handle, if it has
already been allocated previously.
Signed-off-by: Iulia Tanasescu <iulia.tanasescu@nxp.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/hci_conn.c

@@ -1494,6 +1494,18 @@ static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
 
 	/* Allocate BIS if not set */
 	if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
+		if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
+			conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
+
+			if (conn) {
+				/* If the BIG handle is already matched to an advertising
+				 * handle, do not allocate a new one.
+				 */
+				qos->bcast.bis = conn->iso_qos.bcast.bis;
+				return 0;
+			}
+		}
+
 		/* Find an unused adv set to advertise BIS, skip instance 0x00
 		 * since it is reserved as general purpose set.
 		 */