hci_dev_hold
hci_dev_hold(hdev);
hdev = hci_dev_hold(hdev);
hci_dev_hold(hdev);
hci_dev_hold(hdev);
hci_dev_hold(hdev);
hdev = hci_dev_hold(d);
hci_dev_hold(hdev);
hdev = hci_dev_hold(conn->hcon->hdev);