__QLCNIC_MBX_POLL_ENABLE
if (!test_bit(__QLCNIC_MBX_POLL_ENABLE, &adapter->state))
if (test_and_set_bit(__QLCNIC_MBX_POLL_ENABLE, &adapter->state))
if (!test_and_clear_bit(__QLCNIC_MBX_POLL_ENABLE, &adapter->state))