net: mvpp2: fix use of the random mac address for PPv2.2

The MAC retrieval logic is using a variable to store an h/w stored mac
address and checks this mac against invalid ones before using it. But
the mac address is only read from h/w when using PPv2.1. So when using
PPv2.2 it defaults to its init state.

This patches fixes the logic to only check if the h/w mac is valid when
actually retrieving a mac from h/w.
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2.c

@@ -7478,16 +7478,18 @@ static void mvpp2_port_copy_mac_addr(struct net_device *dev, struct mvpp2 *priv,
 		*mac_from = "device tree";
 		ether_addr_copy(dev->dev_addr, dt_mac_addr);
 	} else {
-		if (priv->hw_version == MVPP21)
+		if (priv->hw_version == MVPP21) {
 			mvpp21_get_mac_address(port, hw_mac_addr);
 			if (is_valid_ether_addr(hw_mac_addr)) {
 				*mac_from = "hardware";
 				ether_addr_copy(dev->dev_addr, hw_mac_addr);
-		} else {
+				return;
+			}
+		}
+
 		*mac_from = "random";
 		eth_hw_addr_random(dev);
 	}
-	}
 }
 
 /* Ports initialization */