cxgb3: fix link flap

The driver is expected to report that the link is up
when the phy Rx signal is established and the mac
has not detected a link fault.
The code is however broken, the driver does not check the link fault
status when the phy link status changes.
The link fault status being checked within a short period of time,
it leads to link up/link down events.
Signed-off-by: NDivy Le Ray <divy@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/cxgb3/t3_hw.c

@@ -1262,7 +1262,8 @@ void t3_link_changed(struct adapter *adapter, int port_id)
 		lc->fc = fc;
 	}
 
-	t3_os_link_changed(adapter, port_id, link_ok, speed, duplex, fc);
+	t3_os_link_changed(adapter, port_id, link_ok && !pi->link_fault,
+			   speed, duplex, fc);
 }
 
 void t3_link_fault(struct adapter *adapter, int port_id)