RXRPC_CALL_CONN_CHALLENGING
__set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags);
if (call && __test_and_clear_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags))
if (notify && !test_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags)) {