From: Jakub Kicinski <kuba@kernel.org>
Date: Fri, 8 Oct 2021 10:59:09 -0700
Subject: ethernet: forcedeth: remove direct netdev->dev_addr writes
Patch-mainline: v5.16-rc1
Git-commit: 2b37367065c7d863c087e6ee4b5bf4d97019265e
References: jsc#PED-1565

forcedeth writes to dev_addr byte by byte, make it use
a local buffer instead. Commit the changes with
eth_hw_addr_set() at the end.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/nvidia/forcedeth.c |   49 ++++++++++++++++----------------
 1 file changed, 26 insertions(+), 23 deletions(-)

--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -5711,6 +5711,7 @@ static int nv_probe(struct pci_dev *pci_
 	u32 phystate_orig = 0, phystate;
 	int phyinitialized = 0;
 	static int printed_version;
+	u8 mac[ETH_ALEN];
 
 	if (!printed_version++)
 		pr_info("Reverse Engineered nForce ethernet driver. Version %s.\n",
@@ -5888,50 +5889,52 @@ static int nv_probe(struct pci_dev *pci_
 	txreg = readl(base + NvRegTransmitPoll);
 	if (id->driver_data & DEV_HAS_CORRECT_MACADDR) {
 		/* mac address is already in correct order */
-		dev->dev_addr[0] = (np->orig_mac[0] >>  0) & 0xff;
-		dev->dev_addr[1] = (np->orig_mac[0] >>  8) & 0xff;
-		dev->dev_addr[2] = (np->orig_mac[0] >> 16) & 0xff;
-		dev->dev_addr[3] = (np->orig_mac[0] >> 24) & 0xff;
-		dev->dev_addr[4] = (np->orig_mac[1] >>  0) & 0xff;
-		dev->dev_addr[5] = (np->orig_mac[1] >>  8) & 0xff;
+		mac[0] = (np->orig_mac[0] >>  0) & 0xff;
+		mac[1] = (np->orig_mac[0] >>  8) & 0xff;
+		mac[2] = (np->orig_mac[0] >> 16) & 0xff;
+		mac[3] = (np->orig_mac[0] >> 24) & 0xff;
+		mac[4] = (np->orig_mac[1] >>  0) & 0xff;
+		mac[5] = (np->orig_mac[1] >>  8) & 0xff;
 	} else if (txreg & NVREG_TRANSMITPOLL_MAC_ADDR_REV) {
 		/* mac address is already in correct order */
-		dev->dev_addr[0] = (np->orig_mac[0] >>  0) & 0xff;
-		dev->dev_addr[1] = (np->orig_mac[0] >>  8) & 0xff;
-		dev->dev_addr[2] = (np->orig_mac[0] >> 16) & 0xff;
-		dev->dev_addr[3] = (np->orig_mac[0] >> 24) & 0xff;
-		dev->dev_addr[4] = (np->orig_mac[1] >>  0) & 0xff;
-		dev->dev_addr[5] = (np->orig_mac[1] >>  8) & 0xff;
+		mac[0] = (np->orig_mac[0] >>  0) & 0xff;
+		mac[1] = (np->orig_mac[0] >>  8) & 0xff;
+		mac[2] = (np->orig_mac[0] >> 16) & 0xff;
+		mac[3] = (np->orig_mac[0] >> 24) & 0xff;
+		mac[4] = (np->orig_mac[1] >>  0) & 0xff;
+		mac[5] = (np->orig_mac[1] >>  8) & 0xff;
 		/*
 		 * Set orig mac address back to the reversed version.
 		 * This flag will be cleared during low power transition.
 		 * Therefore, we should always put back the reversed address.
 		 */
-		np->orig_mac[0] = (dev->dev_addr[5] << 0) + (dev->dev_addr[4] << 8) +
-			(dev->dev_addr[3] << 16) + (dev->dev_addr[2] << 24);
-		np->orig_mac[1] = (dev->dev_addr[1] << 0) + (dev->dev_addr[0] << 8);
+		np->orig_mac[0] = (mac[5] << 0) + (mac[4] << 8) +
+			(mac[3] << 16) + (mac[2] << 24);
+		np->orig_mac[1] = (mac[1] << 0) + (mac[0] << 8);
 	} else {
 		/* need to reverse mac address to correct order */
-		dev->dev_addr[0] = (np->orig_mac[1] >>  8) & 0xff;
-		dev->dev_addr[1] = (np->orig_mac[1] >>  0) & 0xff;
-		dev->dev_addr[2] = (np->orig_mac[0] >> 24) & 0xff;
-		dev->dev_addr[3] = (np->orig_mac[0] >> 16) & 0xff;
-		dev->dev_addr[4] = (np->orig_mac[0] >>  8) & 0xff;
-		dev->dev_addr[5] = (np->orig_mac[0] >>  0) & 0xff;
+		mac[0] = (np->orig_mac[1] >>  8) & 0xff;
+		mac[1] = (np->orig_mac[1] >>  0) & 0xff;
+		mac[2] = (np->orig_mac[0] >> 24) & 0xff;
+		mac[3] = (np->orig_mac[0] >> 16) & 0xff;
+		mac[4] = (np->orig_mac[0] >>  8) & 0xff;
+		mac[5] = (np->orig_mac[0] >>  0) & 0xff;
 		writel(txreg|NVREG_TRANSMITPOLL_MAC_ADDR_REV, base + NvRegTransmitPoll);
 		dev_dbg(&pci_dev->dev,
 			"%s: set workaround bit for reversed mac addr\n",
 			__func__);
 	}
 
-	if (!is_valid_ether_addr(dev->dev_addr)) {
+	if (is_valid_ether_addr(mac)) {
+		eth_hw_addr_set(dev, mac);
+	} else {
 		/*
 		 * Bad mac address. At least one bios sets the mac address
 		 * to 01:23:45:67:89:ab
 		 */
 		dev_err(&pci_dev->dev,
 			"Invalid MAC address detected: %pM - Please complain to your hardware vendor.\n",
-			dev->dev_addr);
+			mac);
 		eth_hw_addr_random(dev);
 		dev_err(&pci_dev->dev,
 			"Using random MAC address: %pM\n", dev->dev_addr);