Bluetooth: Update background scan parameters

If new scanning parameters are set while background scan is running,
we should restart background scanning so these parameters are updated.
Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/mgmt.c

@@ -3924,6 +3924,21 @@ static int set_scan_params(struct sock *sk, struct hci_dev *hdev,
 
 	err = cmd_complete(sk, hdev->id, MGMT_OP_SET_SCAN_PARAMS, 0, NULL, 0);
 
+	/* If background scan is running, restart it so new parameters are
+	 * loaded.
+	 */
+	if (test_bit(HCI_LE_SCAN, &hdev->dev_flags) &&
+	    hdev->discovery.state == DISCOVERY_STOPPED) {
+		struct hci_request req;
+
+		hci_req_init(&req, hdev);
+
+		hci_req_add_le_scan_disable(&req);
+		hci_req_add_le_passive_scan(&req);
+
+		hci_req_run(&req, NULL);
+	}
+
 	hci_dev_unlock(hdev);
 
 	return err;