LINK_STATUS_TX_FLOW_CONTROL_ENABLED
vars->link_status |= (LINK_STATUS_TX_FLOW_CONTROL_ENABLED |
if (vars->link_status & LINK_STATUS_TX_FLOW_CONTROL_ENABLED)
LINK_STATUS_TX_FLOW_CONTROL_ENABLED;
!!(status & LINK_STATUS_TX_FLOW_CONTROL_ENABLED);