cxgb3 - Tighten xgmac workaround

Run the watchdog task when the link is up.
Flush the XGMAC Tx FIFO when the link drops.

Also remove a statistics update that should have gone
in the previous modification of xgmac.c.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 145b67c..512daf7 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -185,16 +185,26 @@
 			int speed, int duplex, int pause)
 {
 	struct net_device *dev = adapter->port[port_id];
+	struct port_info *pi = netdev_priv(dev);
+	struct cmac *mac = &pi->mac;
 
 	/* Skip changes from disabled ports. */
 	if (!netif_running(dev))
 		return;
 
 	if (link_stat != netif_carrier_ok(dev)) {
-		if (link_stat)
+		if (link_stat) {
+			t3_set_reg_field(adapter,
+					 A_XGM_TXFIFO_CFG + mac->offset,
+					 F_ENDROPPKT, 0);
 			netif_carrier_on(dev);
-		else
+		} else {
 			netif_carrier_off(dev);
+			t3_set_reg_field(adapter,
+					 A_XGM_TXFIFO_CFG + mac->offset,
+					 F_ENDROPPKT, F_ENDROPPKT);
+		}
+
 		link_report(dev);
 	}
 }
@@ -2119,7 +2129,7 @@
 			continue;
 
 		status = 0;
-		if (netif_running(dev))
+		if (netif_running(dev) && netif_carrier_ok(dev))
 			status = t3b2_mac_watchdog_task(&p->mac);
 		if (status == 1)
 			p->mac.stats.num_toggled++;