le_conn_timeout
struct delayed_work le_conn_timeout;
INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
cancel_delayed_work(&conn->le_conn_timeout);
le_conn_timeout.work);
&conn->le_conn_timeout,
&conn->le_conn_timeout,
cancel_delayed_work(&conn->le_conn_timeout);
flush_delayed_work(&conn->le_conn_timeout);