linux-kernel - [Aspeed, v1 1/1] net: ftgmac100: Change the order of getting MAC address

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Date:   Mon, 21 Dec 2020 15:51:57 -0500
From:   Hongwei Zhang <hongweiz@....com>
To:     <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <openbmc@...ts.ozlabs.org>, Jakub Kicinski <kuba@...nel.org>,
        David S Miller <davem@...emloft.net>
CC:     Hongwei Zhang <hongweiz@....com>, netdev <netdev@...r.kernel.org>,
        Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
Subject: [Aspeed, v1 1/1] net: ftgmac100: Change the order of getting MAC address

Change the order of reading MAC address, try to read it from MAC chip
first, if it's not availabe, then try to read it from device tree.

Fixes: 35c54922dc97 ("ARM: dts: tacoma: Add reserved memory for ramoops")
Signed-off-by: Hongwei Zhang <hongweiz@....com>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 65cd25372020..9be69cbdab96 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -184,14 +184,7 @@ static void ftgmac100_initial_mac(struct ftgmac100 *priv)
 	unsigned int l;
 	void *addr;
 
-	addr = device_get_mac_address(priv->dev, mac, ETH_ALEN);
-	if (addr) {
-		ether_addr_copy(priv->netdev->dev_addr, mac);
-		dev_info(priv->dev, "Read MAC address %pM from device tree\n",
-			 mac);
-		return;
-	}
-
+	/* Read from Chip if not from chip */
 	m = ioread32(priv->base + FTGMAC100_OFFSET_MAC_MADR);
 	l = ioread32(priv->base + FTGMAC100_OFFSET_MAC_LADR);
 
@@ -205,7 +198,18 @@ static void ftgmac100_initial_mac(struct ftgmac100 *priv)
 	if (is_valid_ether_addr(mac)) {
 		ether_addr_copy(priv->netdev->dev_addr, mac);
 		dev_info(priv->dev, "Read MAC address %pM from chip\n", mac);
-	} else {
+		return;
+	}
+
+	/* Read from Chip if not from device tree */
+	addr = device_get_mac_address(priv->dev, mac, ETH_ALEN);
+	if (addr) {
+		ether_addr_copy(priv->netdev->dev_addr, mac);
+		dev_info(priv->dev, "Read MAC address %pM from device tree\n",
+				mac);
+		return;
+	}
+	else {
 		eth_hw_addr_random(priv->netdev);
 		dev_info(priv->dev, "Generated random MAC address %pM\n",
 			 priv->netdev->dev_addr);
-- 
2.17.1