Bluetooth: hci_sync: Use address filtering when HCI_PA_SYNC is set

If HCI_PA_SYNC flag is set it means there is a Periodic Advertising
Synchronization pending, so this attempts to locate the address passed
to HCI_OP_LE_PA_CREATE_SYNC and program it in the accept list so only
reports with that address are processed.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/hci_sync.c

@@ -2562,6 +2562,16 @@ static struct conn_params *conn_params_copy(struct list_head *list, size_t *n)
 	return p;
 }
 
+/* Clear LE Accept List */
+static int hci_le_clear_accept_list_sync(struct hci_dev *hdev)
+{
+	if (!(hdev->commands[26] & 0x80))
+		return 0;
+
+	return __hci_cmd_sync_status(hdev, HCI_OP_LE_CLEAR_ACCEPT_LIST, 0, NULL,
+				     HCI_CMD_TIMEOUT);
+}
+
 /* Device must not be scanning when updating the accept list.
  *
  * Update is done using the following sequence:
@@ -2610,6 +2620,31 @@ static u8 hci_update_accept_list_sync(struct hci_dev *hdev)
 		goto done;
 	}
 
+	/* Force address filtering if PA Sync is in progress */
+	if (hci_dev_test_flag(hdev, HCI_PA_SYNC)) {
+		struct hci_cp_le_pa_create_sync *sent;
+
+		sent = hci_sent_cmd_data(hdev, HCI_OP_LE_PA_CREATE_SYNC);
+		if (sent) {
+			struct conn_params pa;
+
+			memset(&pa, 0, sizeof(pa));
+
+			bacpy(&pa.addr, &sent->addr);
+			pa.addr_type = sent->addr_type;
+
+			/* Clear first since there could be addresses left
+			 * behind.
+			 */
+			hci_le_clear_accept_list_sync(hdev);
+
+			num_entries = 1;
+			err = hci_le_add_accept_list_sync(hdev, &pa,
+							  &num_entries);
+			goto done;
+		}
+	}
+
 	/* Go through the current accept list programmed into the
 	 * controller one by one and check if that address is connected or is
 	 * still in the list of pending connections or list of devices to
@@ -4216,16 +4251,6 @@ static int hci_le_read_accept_list_size_sync(struct hci_dev *hdev)
 				     0, NULL, HCI_CMD_TIMEOUT);
 }
 
-/* Clear LE Accept List */
-static int hci_le_clear_accept_list_sync(struct hci_dev *hdev)
-{
-	if (!(hdev->commands[26] & 0x80))
-		return 0;
-
-	return __hci_cmd_sync_status(hdev, HCI_OP_LE_CLEAR_ACCEPT_LIST, 0, NULL,
-				     HCI_CMD_TIMEOUT);
-}
-
 /* Read LE Resolving List Size */
 static int hci_le_read_resolv_list_size_sync(struct hci_dev *hdev)
 {