l2cap_conn_hold_unless_zero
struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *conn);
*conn = l2cap_conn_hold_unless_zero(hcon->l2cap_data);
EXPORT_SYMBOL(l2cap_conn_hold_unless_zero);
conn = l2cap_conn_hold_unless_zero(conn);
conn = l2cap_conn_hold_unless_zero(chan->conn);