net: hns3: synchronize speed and duplex from phy when phy link up

Driver calls phy_connect_direct and registers hclge_mac_adjust_link
to synchronize mac speed and duplex from phy. It is better to
synchronize mac speed and duplex from phy when phy link up.
Signed-off-by: NPeng Li <lipeng321@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mdio.c

@@ -179,6 +179,10 @@ static void hclge_mac_adjust_link(struct net_device *netdev)
 	int duplex, speed;
 	int ret;
 
+	/* When phy link down, do nothing */
+	if (netdev->phydev->link == 0)
+		return;
+
 	speed = netdev->phydev->speed;
 	duplex = netdev->phydev->duplex;