Bluetooth: HCI: Add proper tracking for enable status of adv instances

This adds a field to track if advertising instances are enabled or not
and only clear HCI_LE_ADV flag if there is no instance left advertising.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci_core.h

@@ -221,6 +221,7 @@ struct oob_data {
 
 struct adv_info {
 	struct list_head list;
+	bool enabled;
 	bool pending;
 	__u8	instance;
 	__u32	flags;

net/bluetooth/hci_event.c

@@ -1277,7 +1277,9 @@ static void hci_cc_le_set_ext_adv_enable(struct hci_dev *hdev,
 					 struct sk_buff *skb)
 {
 	struct hci_cp_le_set_ext_adv_enable *cp;
+	struct hci_cp_ext_adv_set *set;
 	__u8 status = *((__u8 *) skb->data);
+	struct adv_info *adv = NULL, *n;
 
 	BT_DBG("%s status 0x%2.2x", hdev->name, status);
 
@@ -1288,22 +1290,48 @@ static void hci_cc_le_set_ext_adv_enable(struct hci_dev *hdev,
 	if (!cp)
 		return;
 
+	set = (void *)cp->data;
+
 	hci_dev_lock(hdev);
 
+	if (cp->num_of_sets)
+		adv = hci_find_adv_instance(hdev, set->handle);
+
 	if (cp->enable) {
 		struct hci_conn *conn;
 
 		hci_dev_set_flag(hdev, HCI_LE_ADV);
 
+		if (adv)
+			adv->enabled = true;
+
 		conn = hci_lookup_le_connect(hdev);
 		if (conn)
 			queue_delayed_work(hdev->workqueue,
 					   &conn->le_conn_timeout,
 					   conn->conn_timeout);
 	} else {
+		if (adv) {
+			adv->enabled = false;
+			/* If just one instance was disabled check if there are
+			 * any other instance enabled before clearing HCI_LE_ADV
+			 */
+			list_for_each_entry_safe(adv, n, &hdev->adv_instances,
+						 list) {
+				if (adv->enabled)
+					goto unlock;
+			}
+		} else {
+			/* All instances shall be considered disabled */
+			list_for_each_entry_safe(adv, n, &hdev->adv_instances,
+						 list)
+				adv->enabled = false;
+		}
+
 		hci_dev_clear_flag(hdev, HCI_LE_ADV);
 	}
 
+unlock:
 	hci_dev_unlock(hdev);
 }