From: Antoine Tenart <antoine.tenart@free-electrons.com>
Date: Sat, 2 Sep 2017 11:06:48 +0200
Subject: net: mvpp2: fix use of the random mac address for PPv2.2
Patch-mainline: v4.14-rc1
Git-commit: d2a6e48e5254f653decc1612f3cbee3e5c8592c7
References: bsc#1098633

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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/mvpp2.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -7478,15 +7478,17 @@ static void mvpp2_port_copy_mac_addr(str
 		*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 {
-			*mac_from = "random";
-			eth_hw_addr_random(dev);
+			if (is_valid_ether_addr(hw_mac_addr)) {
+				*mac_from = "hardware";
+				ether_addr_copy(dev->dev_addr, hw_mac_addr);
+				return;
+			}
 		}
+
+		*mac_from = "random";
+		eth_hw_addr_random(dev);
 	}
 }