hci_find_link_key
struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr);
key = hci_find_link_key(conn->hdev, &conn->dst);
old_key = hci_find_link_key(hdev, bdaddr);
key = hci_find_link_key(hdev, bdaddr);
if (hci_find_link_key(hdev, bdaddr))
!hci_find_link_key(hdev, &ev->bdaddr))
key = hci_find_link_key(hdev, &ev->bdaddr);
key = hci_find_link_key(hdev, &ev->bdaddr);
if (hci_find_link_key(hdev, &ev->bdaddr)) {
key = hci_find_link_key(hdev, &hcon->dst);