net: ethernet: support of_get_mac_address new ERR_PTR error

ynezz · claudiubeznea · commit 1af87051da6a · 2020-01-13T11:06:24.000+02:00
There was NVMEM support added to of_get_mac_address, so it could now return ERR_PTR encoded error values, so we need to adjust all current users of of_get_mac_address to this new fact. While at it, remove superfluous is_valid_ether_addr as the MAC address returned from of_get_mac_address is always valid and checked by is_valid_ether_addr anyway. Fixes: d01f449 ("of_net: add NVMEM support to of_get_mac_address") Signed-off-by: Petr Štetiar <ynezz@true.cz> Signed-off-by: David S. Miller <davem@davemloft.net> [claudiu.beznea@microchip.com: remove drivers/net/ethernet/lantiq_xrx200.c] Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/drivers/net/ethernet/aeroflex/greth.c b/drivers/net/ethernet/aeroflex/greth.c
@@ -1459,7 +1459,7 @@ static int greth_of_probe(struct platform_device *ofdev)
 		const u8 *addr;
 
 		addr = of_get_mac_address(ofdev->dev.of_node);
-		if (addr) {
+		if (!IS_ERR(addr)) {
 			for (i = 0; i < 6; i++)
 				macaddr[i] = (unsigned int) addr[i];
 		} else {
diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -870,7 +870,7 @@ static int emac_probe(struct platform_device *pdev)
 
 	/* Read MAC-address from DT */
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
 
 	/* Check if the MAC address is valid, if not get a random one */
diff --git a/drivers/net/ethernet/altera/altera_tse_main.c b/drivers/net/ethernet/altera/altera_tse_main.c
@@ -1535,7 +1535,7 @@ static int altera_tse_probe(struct platform_device *pdev)
 
 	/* get default MAC address from device tree */
 	macaddr = of_get_mac_address(pdev->dev.of_node);
-	if (macaddr)
+	if (!IS_ERR(macaddr))
 		ether_addr_copy(ndev->dev_addr, macaddr);
 	else
 		eth_hw_addr_random(ndev);
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
@@ -959,7 +959,7 @@ int arc_emac_probe(struct net_device *ndev, int interface)
 	/* Get MAC address from device tree */
 	mac_addr = of_get_mac_address(dev->of_node);
 
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
 	else
 		eth_hw_addr_random(ndev);
diff --git a/drivers/net/ethernet/aurora/nb8800.c b/drivers/net/ethernet/aurora/nb8800.c
@@ -1468,7 +1468,7 @@ static int nb8800_probe(struct platform_device *pdev)
 	dev->irq = irq;
 
 	mac = of_get_mac_address(pdev->dev.of_node);
-	if (mac)
+	if (!IS_ERR(mac))
 		ether_addr_copy(dev->dev_addr, mac);
 
 	if (!is_valid_ether_addr(dev->dev_addr))
diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -2494,7 +2494,7 @@ static int bcm_sysport_probe(struct platform_device *pdev)
 
 	/* Initialize netdevice members */
 	macaddr = of_get_mac_address(dn);
-	if (!macaddr || !is_valid_ether_addr(macaddr)) {
+	if (IS_ERR(macaddr)) {
 		dev_warn(&pdev->dev, "using random Ethernet MAC\n");
 		eth_hw_addr_random(dev);
 	} else {
diff --git a/drivers/net/ethernet/broadcom/bgmac-bcma.c b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -132,7 +132,7 @@ static int bgmac_probe(struct bcma_device *core)
 		mac = of_get_mac_address(bgmac->dev->of_node);
 
 	/* If no MAC address assigned via device tree, check SPROM */
-	if (!mac) {
+	if (IS_ERR_OR_NULL(mac)) {
 		switch (core->core_unit) {
 		case 0:
 			mac = sprom->et0mac;
diff --git a/drivers/net/ethernet/broadcom/bgmac-platform.c b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -193,7 +193,7 @@ static int bgmac_probe(struct platform_device *pdev)
 	bgmac->dma_dev = &pdev->dev;
 
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		ether_addr_copy(bgmac->net_dev->dev_addr, mac_addr);
 	else
 		dev_warn(&pdev->dev, "MAC address not present in device tree\n");
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -3476,7 +3476,7 @@ static int bcmgenet_probe(struct platform_device *pdev)
 
 	if (dn) {
 		macaddr = of_get_mac_address(dn);
-		if (!macaddr) {
+		if (IS_ERR(macaddr)) {
 			dev_err(&pdev->dev, "can't find MAC address\n");
 			err = -EINVAL;
 			goto err;
diff --git a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
@@ -1499,7 +1499,7 @@ static int octeon_mgmt_probe(struct platform_device *pdev)
 
 	mac = of_get_mac_address(pdev->dev.of_node);
 
-	if (mac)
+	if (!IS_ERR(mac))
 		memcpy(netdev->dev_addr, mac, ETH_ALEN);
 	else
 		eth_hw_addr_random(netdev);
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -1484,7 +1484,7 @@ static int bgx_init_of_phy(struct bgx *bgx)
 			break;
 
 		mac = of_get_mac_address(node);
-		if (mac)
+		if (!IS_ERR(mac))
 			ether_addr_copy(bgx->lmac[lmac].mac, mac);
 
 		SET_NETDEV_DEV(&bgx->lmac[lmac].netdev, &bgx->pdev->dev);
diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
@@ -1411,7 +1411,7 @@ static struct dm9000_plat_data *dm9000_parse_dt(struct device *dev)
 		pdata->flags |= DM9000_PLATF_NO_EEPROM;
 
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(pdata->dev_addr, mac_addr, sizeof(pdata->dev_addr));
 
 	return pdata;
diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
@@ -1153,7 +1153,7 @@ static int ethoc_probe(struct platform_device *pdev)
 		const void *mac;
 
 		mac = of_get_mac_address(pdev->dev.of_node);
-		if (mac)
+		if (!IS_ERR(mac))
 			ether_addr_copy(netdev->dev_addr, mac);
 		priv->phy_id = -1;
 	}
diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c
@@ -616,7 +616,7 @@ static s32 nps_enet_probe(struct platform_device *pdev)
 
 	/* set kernel MAC address to dev */
 	mac_addr = of_get_mac_address(dev->of_node);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		ether_addr_copy(ndev->dev_addr, mac_addr);
 	else
 		eth_hw_addr_random(ndev);
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
@@ -1655,7 +1655,7 @@ static void fec_get_mac(struct net_device *ndev)
 		struct device_node *np = fep->pdev->dev.of_node;
 		if (np) {
 			const char *mac = of_get_mac_address(np);
-			if (mac)
+			if (!IS_ERR(mac))
 				iap = (unsigned char *) mac;
 		}
 	}
diff --git a/drivers/net/ethernet/freescale/fec_mpc52xx.c b/drivers/net/ethernet/freescale/fec_mpc52xx.c
@@ -901,7 +901,7 @@ static int mpc52xx_fec_probe(struct platform_device *op)
 	 * First try to read MAC address from DT
 	 */
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr) {
+	if (!IS_ERR(mac_addr)) {
 		memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
 	} else {
 		struct mpc52xx_fec __iomem *fec = priv->fec;
diff --git a/drivers/net/ethernet/freescale/fman/mac.c b/drivers/net/ethernet/freescale/fman/mac.c
@@ -728,7 +728,7 @@ static int mac_probe(struct platform_device *_of_dev)
 
 	/* Get the MAC address */
 	mac_addr = of_get_mac_address(mac_node);
-	if (!mac_addr) {
+	if (IS_ERR(mac_addr)) {
 		dev_err(dev, "of_get_mac_address(%pOF) failed\n", mac_node);
 		err = -EINVAL;
 		goto _return_of_get_parent;
diff --git a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
@@ -1013,7 +1013,7 @@ static int fs_enet_probe(struct platform_device *ofdev)
 	spin_lock_init(&fep->tx_lock);
 
 	mac_addr = of_get_mac_address(ofdev->dev.of_node);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
 
 	ret = fep->ops->allocate_bd(ndev);
diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
@@ -873,7 +873,7 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
 
 	mac_addr = of_get_mac_address(np);
 
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
 
 	if (model && !strcasecmp(model, "TSEC"))
diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
@@ -3910,7 +3910,7 @@ static int ucc_geth_probe(struct platform_device* ofdev)
 	}
 
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
 
 	ugeth->ug_info = ug_info;
diff --git a/drivers/net/ethernet/hisilicon/hisi_femac.c b/drivers/net/ethernet/hisilicon/hisi_femac.c
@@ -870,7 +870,7 @@ static int hisi_femac_drv_probe(struct platform_device *pdev)
 			   phy_modes(phy->interface));
 
 	mac_addr = of_get_mac_address(node);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		ether_addr_copy(ndev->dev_addr, mac_addr);
 	if (!is_valid_ether_addr(ndev->dev_addr)) {
 		eth_hw_addr_random(ndev);
diff --git a/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c b/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
@@ -1229,7 +1229,7 @@ static int hix5hd2_dev_probe(struct platform_device *pdev)
 	}
 
 	mac_addr = of_get_mac_address(node);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		ether_addr_copy(ndev->dev_addr, mac_addr);
 	if (!is_valid_ether_addr(ndev->dev_addr)) {
 		eth_hw_addr_random(ndev);
diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2756,7 +2756,7 @@ static int mv643xx_eth_shared_of_add_port(struct platform_device *pdev,
 	}
 
 	mac_addr = of_get_mac_address(pnp);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(ppd.mac_addr, mac_addr, ETH_ALEN);
 
 	mv643xx_eth_property(pnp, "tx-queue-size", ppd.tx_queue_size);
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
@@ -4501,7 +4501,7 @@ static int mvneta_probe(struct platform_device *pdev)
 	}
 
 	dt_mac_addr = of_get_mac_address(dn);
-	if (dt_mac_addr) {
+	if (!IS_ERR(dt_mac_addr)) {
 		mac_from = "device tree";
 		memcpy(dev->dev_addr, dt_mac_addr, ETH_ALEN);
 	} else {
diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c
@@ -1458,7 +1458,7 @@ static int pxa168_eth_probe(struct platform_device *pdev)
 	if (pdev->dev.of_node)
 		mac_addr = of_get_mac_address(pdev->dev.of_node);
 
-	if (mac_addr && is_valid_ether_addr(mac_addr)) {
+	if (!IS_ERR_OR_NULL(mac_addr)) {
 		ether_addr_copy(dev->dev_addr, mac_addr);
 	} else {
 		/* try reading the mac address, if set by the bootloader */
diff --git a/drivers/net/ethernet/marvell/sky2.c b/drivers/net/ethernet/marvell/sky2.c
@@ -4821,7 +4821,7 @@ static struct net_device *sky2_init_netdev(struct sky2_hw *hw, unsigned port,
 	 * 2) from internal registers set by bootloader
 	 */
 	iap = of_get_mac_address(hw->pdev->dev.of_node);
-	if (iap)
+	if (!IS_ERR(iap))
 		memcpy(dev->dev_addr, iap, ETH_ALEN);
 	else
 		memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8,
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2034,7 +2034,7 @@ static int __init mtk_init(struct net_device *dev)
 	const char *mac_addr;
 
 	mac_addr = of_get_mac_address(mac->of_node);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		ether_addr_copy(dev->dev_addr, mac_addr);
 
 	/* If the mac address is invalid, use random mac address  */
diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
@@ -419,7 +419,7 @@ static void ks8851_init_mac(struct ks8851_net *ks)
 	const u8 *mac_addr;
 
 	mac_addr = of_get_mac_address(ks->spidev->dev.of_node);
-	if (mac_addr) {
+	if (!IS_ERR(mac_addr)) {
 		memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
 		ks8851_write_mac_addr(dev);
 		return;
diff --git a/drivers/net/ethernet/micrel/ks8851_mll.c b/drivers/net/ethernet/micrel/ks8851_mll.c
@@ -1634,7 +1634,7 @@ static int ks8851_probe(struct platform_device *pdev)
 	/* overwriting the default MAC address */
 	if (pdev->dev.of_node) {
 		mac = of_get_mac_address(pdev->dev.of_node);
-		if (mac)
+		if (!IS_ERR(mac))
 			memcpy(ks->mac_addr, mac, ETH_ALEN);
 	} else {
 		struct ks8851_mll_platform_data *pdata;
diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1385,7 +1385,7 @@ static int lpc_eth_drv_probe(struct platform_device *pdev)
 
 	if (!is_valid_ether_addr(ndev->dev_addr)) {
 		const char *macaddr = of_get_mac_address(pdev->dev.of_node);
-		if (macaddr)
+		if (!IS_ERR(macaddr))
 			memcpy(ndev->dev_addr, macaddr, ETH_ALEN);
 	}
 	if (!is_valid_ether_addr(ndev->dev_addr))
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -938,7 +938,7 @@ qca_spi_probe(struct spi_device *spi)
 
 	mac = of_get_mac_address(spi->dev.of_node);
 
-	if (mac)
+	if (!IS_ERR(mac))
 		ether_addr_copy(qca->net_dev->dev_addr, mac);
 
 	if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
diff --git a/drivers/net/ethernet/qualcomm/qca_uart.c b/drivers/net/ethernet/qualcomm/qca_uart.c
@@ -351,7 +351,7 @@ static int qca_uart_probe(struct serdev_device *serdev)
 
 	mac = of_get_mac_address(serdev->dev.of_node);
 
-	if (mac)
+	if (!IS_ERR(mac))
 		ether_addr_copy(qca->net_dev->dev_addr, mac);
 
 	if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
@@ -118,7 +118,7 @@ static void ravb_set_buffer_align(struct sk_buff *skb)
  */
 static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac)
 {
-	if (mac) {
+	if (!IS_ERR(mac)) {
 		ether_addr_copy(ndev->dev_addr, mac);
 	} else {
 		u32 mahr = ravb_read(ndev, MAHR);
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
@@ -3133,7 +3133,7 @@ static struct sh_eth_plat_data *sh_eth_parse_dt(struct device *dev)
 	pdata->phy_interface = of_get_phy_mode(np);
 
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		memcpy(pdata->mac_addr, mac_addr, ETH_ALEN);
 
 	pdata->no_ether_link =
diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c
@@ -124,7 +124,7 @@ static int sxgbe_platform_probe(struct platform_device *pdev)
 	}
 
 	/* Get MAC address if available (DT) */
-	if (mac)
+	if (!IS_ERR_OR_NULL(mac))
 		ether_addr_copy(priv->dev->dev_addr, mac);
 
 	/* Get the TX/RX IRQ numbers */
diff --git a/drivers/net/ethernet/socionext/sni_ave.c b/drivers/net/ethernet/socionext/sni_ave.c
@@ -1605,7 +1605,7 @@ static int ave_probe(struct platform_device *pdev)
 	ndev->max_mtu = AVE_MAX_ETHFRAME - (ETH_HLEN + ETH_FCS_LEN);
 
 	mac_addr = of_get_mac_address(np);
-	if (mac_addr)
+	if (!IS_ERR(mac_addr))
 		ether_addr_copy(ndev->dev_addr, mac_addr);
 
 	/* if the mac address is invalid, use random mac address */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4238,7 +4238,7 @@ int stmmac_dvr_probe(struct device *device,
 	priv->wol_irq = res->wol_irq;
 	priv->lpi_irq = res->lpi_irq;
 
-	if (res->mac)
+	if (!IS_ERR_OR_NULL(res->mac))
 		memcpy(priv->dev->dev_addr, res->mac, ETH_ALEN);
 
 	dev_set_drvdata(device, priv->dev);
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
@@ -3188,7 +3188,7 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
 
 no_phy_slave:
 		mac_addr = of_get_mac_address(slave_node);
-		if (mac_addr) {
+		if (!IS_ERR(mac_addr)) {
 			memcpy(slave_data->mac_addr, mac_addr, ETH_ALEN);
 		} else {
 			ret = ti_cm_get_macid(&pdev->dev, i,
diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c
@@ -2051,7 +2051,7 @@ static int netcp_create_interface(struct netcp_device *netcp_device,
 		devm_release_mem_region(dev, res.start, size);
 	} else {
 		mac_addr = of_get_mac_address(node_interface);
-		if (mac_addr)
+		if (!IS_ERR(mac_addr))
 			ether_addr_copy(ndev->dev_addr, mac_addr);
 		else
 			eth_random_addr(ndev->dev_addr);
diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
@@ -1164,7 +1164,7 @@ int w5100_probe(struct device *dev, const struct w5100_ops *ops,
 	INIT_WORK(&priv->setrx_work, w5100_setrx_work);
 	INIT_WORK(&priv->restart_work, w5100_restart_work);
 
-	if (mac_addr)
+	if (!IS_ERR_OR_NULL(mac_addr))
 		memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
 	else
 		eth_hw_addr_random(ndev);
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -1076,7 +1076,7 @@ static int temac_of_probe(struct platform_device *op)
 
 	/* Retrieve the MAC address */
 	addr = of_get_mac_address(op->dev.of_node);
-	if (!addr) {
+	if (!IS_ERR(addr)) {
 		dev_err(&op->dev, "could not find MAC address\n");
 		rc = -ENODEV;
 		goto err_iounmap_2;
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1593,7 +1593,7 @@ static int axienet_probe(struct platform_device *pdev)
 
 	/* Retrieve the MAC address */
 	mac_addr = of_get_mac_address(pdev->dev.of_node);
-	if (!mac_addr) {
+	if (IS_ERR(mac_addr)) {
 		dev_err(&pdev->dev, "could not find MAC address\n");
 		goto free_netdev;
 	}
diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -1142,7 +1142,7 @@ static int xemaclite_of_probe(struct platform_device *ofdev)
 	lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
 	mac_address = of_get_mac_address(ofdev->dev.of_node);
 
-	if (mac_address) {
+	if (!IS_ERR(mac_address)) {
 		/* Set the MAC address. */
 		memcpy(ndev->dev_addr, mac_address, ETH_ALEN);
 	} else {
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
@@ -539,7 +539,7 @@ int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
 	addr = NULL;
 	if (dp)
 		addr = of_get_mac_address(dp);
-	if (!addr)
+	if (IS_ERR_OR_NULL(addr))
 		addr = arch_get_platform_mac_address();
 
 	if (!addr)
