[openwrt/staging/lynxis.git] /

From 83216e3988cd196183542937c9bd58b279f946af Mon Sep 17 00:00:00 2001
From: Michael Walle <michael@walle.cc>
Date: Mon, 12 Apr 2021 19:47:17 +0200
Subject: of: net: pass the dst buffer to of_get_mac_address()

of_get_mac_address() returns a "const void*" pointer to a MAC address.
Lately, support to fetch the MAC address by an NVMEM provider was added.
But this will only work with platform devices. It will not work with
PCI devices (e.g. of an integrated root complex) and esp. not with DSA
ports.

There is an of_* variant of the nvmem binding which works without
devices. The returned data of a nvmem_cell_read() has to be freed after
use. On the other hand the return of_get_mac_address() points to some
static data without a lifetime. The trick for now, was to allocate a
device resource managed buffer which is then returned. This will only
work if we have an actual device.

Change it, so that the caller of of_get_mac_address() has to supply a
buffer where the MAC address is written to. Unfortunately, this will
touch all drivers which use the of_get_mac_address().

Usually the code looks like:

  const char *addr;
  addr = of_get_mac_address(np);
  if (!IS_ERR(addr))
    ether_addr_copy(ndev->dev_addr, addr);

This can then be simply rewritten as:

  of_get_mac_address(np, ndev->dev_addr);

Sometimes is_valid_ether_addr() is used to test the MAC address.
of_get_mac_address() already makes sure, it just returns a valid MAC
address. Thus we can just test its return code. But we have to be
careful if there are still other sources for the MAC address before the
of_get_mac_address(). In this case we have to keep the
is_valid_ether_addr() call.

The following coccinelle patch was used to convert common cases to the
new style. Afterwards, I've manually gone over the drivers and fixed the
return code variable: either used a new one or if one was already
available use that. Mansour Moufid, thanks for that coccinelle patch!

<spml>
@a@
identifier x;
expression y, z;
@@
- x = of_get_mac_address(y);
+ x = of_get_mac_address(y, z);
  <...
- ether_addr_copy(z, x);
  ...>

@@
identifier a.x;
@@
- if (<+... x ...+>) {}

@@
identifier a.x;
@@
  if (<+... x ...+>) {
      ...
  }
- else {}

@@
identifier a.x;
expression e;
@@
- if (<+... x ...+>@e)
-     {}
- else
+ if (!(e))
      {...}

@@
expression x, y, z;
@@
- x = of_get_mac_address(y, z);
+ of_get_mac_address(y, z);
  ... when != x
</spml>

All drivers, except drivers/net/ethernet/aeroflex/greth.c, were
compile-time tested.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 arch/arm/mach-mvebu/kirkwood.c                     |  3 +-
 arch/powerpc/sysdev/tsi108_dev.c                   |  5 +-
 drivers/net/ethernet/aeroflex/greth.c              |  6 +--
 drivers/net/ethernet/allwinner/sun4i-emac.c        | 10 ++--
 drivers/net/ethernet/altera/altera_tse_main.c      |  7 +--
 drivers/net/ethernet/arc/emac_main.c               |  8 +--
 drivers/net/ethernet/atheros/ag71xx.c              |  7 +--
 drivers/net/ethernet/broadcom/bcm4908_enet.c       |  7 +--
 drivers/net/ethernet/broadcom/bcmsysport.c         |  7 +--
 drivers/net/ethernet/broadcom/bgmac-bcma.c         | 10 ++--
 drivers/net/ethernet/broadcom/bgmac-platform.c     | 11 ++--
 drivers/net/ethernet/cadence/macb_main.c           | 11 ++--
 drivers/net/ethernet/cavium/octeon/octeon_mgmt.c   |  8 +--
 drivers/net/ethernet/cavium/thunder/thunder_bgx.c  |  5 +-
 drivers/net/ethernet/davicom/dm9000.c              | 10 ++--
 drivers/net/ethernet/ethoc.c                       |  6 +--
 drivers/net/ethernet/ezchip/nps_enet.c             |  7 +--
 drivers/net/ethernet/freescale/fec_main.c          |  7 +--
 drivers/net/ethernet/freescale/fec_mpc52xx.c       |  7 +--
 drivers/net/ethernet/freescale/fman/mac.c          |  9 ++--
 .../net/ethernet/freescale/fs_enet/fs_enet-main.c  |  5 +-
 drivers/net/ethernet/freescale/gianfar.c           |  8 +--
 drivers/net/ethernet/freescale/ucc_geth.c          |  5 +-
 drivers/net/ethernet/hisilicon/hisi_femac.c        |  7 +--
 drivers/net/ethernet/hisilicon/hix5hd2_gmac.c      |  7 +--
 drivers/net/ethernet/lantiq_xrx200.c               |  7 +--
 drivers/net/ethernet/marvell/mv643xx_eth.c         |  5 +-
 drivers/net/ethernet/marvell/mvneta.c              |  6 +--
 .../net/ethernet/marvell/prestera/prestera_main.c  | 11 ++--
 drivers/net/ethernet/marvell/pxa168_eth.c          |  9 +---
 drivers/net/ethernet/marvell/sky2.c                |  8 ++-
 drivers/net/ethernet/mediatek/mtk_eth_soc.c        | 11 ++--
 drivers/net/ethernet/micrel/ks8851_common.c        |  7 ++-
 drivers/net/ethernet/microchip/lan743x_main.c      |  5 +-
 drivers/net/ethernet/nxp/lpc_eth.c                 |  4 +-
 drivers/net/ethernet/qualcomm/qca_spi.c            | 10 ++--
 drivers/net/ethernet/qualcomm/qca_uart.c           |  9 +---
 drivers/net/ethernet/renesas/ravb_main.c           | 12 +++--
 drivers/net/ethernet/renesas/sh_eth.c              |  5 +-
 .../net/ethernet/samsung/sxgbe/sxgbe_platform.c    | 13 ++---
 drivers/net/ethernet/socionext/sni_ave.c           | 10 ++--
 .../net/ethernet/stmicro/stmmac/dwmac-anarion.c    |  2 +-
 .../ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c    |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-generic.c    |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c    |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-intel-plat.c |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-ipq806x.c    |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c    |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-mediatek.c   |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c  |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c    |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c  |  2 +-
 .../ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c    |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c     |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-socfpga.c    |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c    |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c  |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c  |  2 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c  |  2 +-
 .../net/ethernet/stmicro/stmmac/dwmac-visconti.c   |  2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |  2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |  2 +-
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  | 14 ++---
 .../net/ethernet/stmicro/stmmac/stmmac_platform.h  |  2 +-
 drivers/net/ethernet/ti/am65-cpsw-nuss.c           | 19 ++++---
 drivers/net/ethernet/ti/cpsw.c                     |  7 +--
 drivers/net/ethernet/ti/cpsw_new.c                 |  7 +--
 drivers/net/ethernet/ti/davinci_emac.c             |  8 +--
 drivers/net/ethernet/ti/netcp_core.c               |  7 +--
 drivers/net/ethernet/wiznet/w5100-spi.c            |  8 ++-
 drivers/net/ethernet/wiznet/w5100.c                |  2 +-
 drivers/net/ethernet/xilinx/ll_temac_main.c        |  8 +--
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c  | 15 +++---
 drivers/net/ethernet/xilinx/xilinx_emaclite.c      |  8 +--
 drivers/net/wireless/ath/ath9k/init.c              |  5 +-
 drivers/net/wireless/mediatek/mt76/eeprom.c        |  9 +---
 drivers/net/wireless/ralink/rt2x00/rt2x00dev.c     |  6 +--
 drivers/of/of_net.c                                | 60 ++++++++++------------
 drivers/staging/octeon/ethernet.c                  | 10 ++--
 drivers/staging/wfx/main.c                         |  7 ++-
 include/linux/of_net.h                             |  6 +--
 include/net/dsa.h                                  |  2 +-
 net/dsa/dsa2.c                                     |  2 +-
 net/dsa/slave.c                                    |  2 +-
 net/ethernet/eth.c                                 | 11 ++--
 85 files changed, 218 insertions(+), 364 deletions(-)

--- a/arch/arm/mach-mvebu/kirkwood.c
+++ b/arch/arm/mach-mvebu/kirkwood.c
@@ -84,6 +84,7 @@ static void __init kirkwood_dt_eth_fixup
                struct device_node *pnp = of_get_parent(np);
                struct clk *clk;
                struct property *pmac;
+               u8 tmpmac[ETH_ALEN];
                void __iomem *io;
                u8 *macaddr;
                u32 reg;
@@ -93,7 +94,7 @@ static void __init kirkwood_dt_eth_fixup
 
                /* skip disabled nodes or nodes with valid MAC address*/
                if (!of_device_is_available(pnp) ||
-                   !IS_ERR(of_get_mac_address(np)))
+                   !of_get_mac_address(np, tmpmac))
                        goto eth_fixup_skip;
 
                clk = of_clk_get(pnp, 0);
--- a/arch/powerpc/sysdev/tsi108_dev.c
+++ b/arch/powerpc/sysdev/tsi108_dev.c
@@ -73,7 +73,6 @@ static int __init tsi108_eth_of_init(voi
                struct device_node *phy, *mdio;
                hw_info tsi_eth_data;
                const unsigned int *phy_id;
-               const void *mac_addr;
                const phandle *ph;
 
                memset(r, 0, sizeof(r));
@@ -101,9 +100,7 @@ static int __init tsi108_eth_of_init(voi
                        goto err;
                }
 
-               mac_addr = of_get_mac_address(np);
-               if (!IS_ERR(mac_addr))
-                       ether_addr_copy(tsi_eth_data.mac_addr, mac_addr);
+               of_get_mac_address(np, tsi_eth_data.mac_addr);
 
                ph = of_get_property(np, "mdio-handle", NULL);
                mdio = of_find_node_by_phandle(*ph);
--- a/drivers/net/ethernet/aeroflex/greth.c
+++ b/drivers/net/ethernet/aeroflex/greth.c
@@ -1451,10 +1451,10 @@ static int greth_of_probe(struct platfor
                        break;
        }
        if (i == 6) {
-               const u8 *addr;
+               u8 addr[ETH_ALEN];
 
-               addr = of_get_mac_address(ofdev->dev.of_node);
-               if (!IS_ERR(addr)) {
+               err = of_get_mac_address(ofdev->dev.of_node, addr);
+               if (!err) {
                        for (i = 0; i < 6; i++)
                                macaddr[i] = (unsigned int) addr[i];
                } else {
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -807,7 +807,6 @@ static int emac_probe(struct platform_de
        struct emac_board_info *db;
        struct net_device *ndev;
        int ret = 0;
-       const char *mac_addr;
 
        ndev = alloc_etherdev(sizeof(struct emac_board_info));
        if (!ndev) {
@@ -870,12 +869,9 @@ static int emac_probe(struct platform_de
        }
 
        /* Read MAC-address from DT */
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-
-       /* Check if the MAC address is valid, if not get a random one */
-       if (!is_valid_ether_addr(ndev->dev_addr)) {
+       ret = of_get_mac_address(np, ndev->dev_addr);
+       if (ret) {
+               /* if the MAC address is invalid get a random one */
                eth_hw_addr_random(ndev);
                dev_warn(&pdev->dev, "using random MAC address %pM\n",
                         ndev->dev_addr);
--- a/drivers/net/ethernet/altera/altera_tse_main.c
+++ b/drivers/net/ethernet/altera/altera_tse_main.c
@@ -1351,7 +1351,6 @@ static int altera_tse_probe(struct platf
        struct resource *control_port;
        struct resource *dma_res;
        struct altera_tse_private *priv;
-       const unsigned char *macaddr;
        void __iomem *descmap;
        const struct of_device_id *of_id = NULL;
 
@@ -1525,10 +1524,8 @@ static int altera_tse_probe(struct platf
        priv->rx_dma_buf_sz = ALTERA_RXDMABUFFER_SIZE;
 
        /* get default MAC address from device tree */
-       macaddr = of_get_mac_address(pdev->dev.of_node);
-       if (!IS_ERR(macaddr))
-               ether_addr_copy(ndev->dev_addr, macaddr);
-       else
+       ret = of_get_mac_address(pdev->dev.of_node, ndev->dev_addr);
+       if (ret)
                eth_hw_addr_random(ndev);
 
        /* get phy addr and create mdio */
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -870,7 +870,6 @@ int arc_emac_probe(struct net_device *nd
        struct device_node *phy_node;
        struct phy_device *phydev = NULL;
        struct arc_emac_priv *priv;
-       const char *mac_addr;
        unsigned int id, clock_frequency, irq;
        int err;
 
@@ -955,11 +954,8 @@ int arc_emac_probe(struct net_device *nd
        }
 
        /* Get MAC address from device tree */
-       mac_addr = of_get_mac_address(dev->of_node);
-
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-       else
+       err = of_get_mac_address(dev->of_node, ndev->dev_addr);
+       if (err)
                eth_hw_addr_random(ndev);
 
        arc_emac_set_address_internal(ndev);
--- a/drivers/net/ethernet/atheros/ag71xx.c
+++ b/drivers/net/ethernet/atheros/ag71xx.c
@@ -1634,7 +1634,6 @@ static int ag71xx_probe(struct platform_
        const struct ag71xx_dcfg *dcfg;
        struct net_device *ndev;
        struct resource *res;
-       const void *mac_addr;
        int tx_size, err, i;
        struct ag71xx *ag;
 
@@ -1735,10 +1734,8 @@ static int ag71xx_probe(struct platform_
        ag->stop_desc->ctrl = 0;
        ag->stop_desc->next = (u32)ag->stop_desc_dma;
 
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr))
-               memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
-       if (IS_ERR(mac_addr) || !is_valid_ether_addr(ndev->dev_addr)) {
+       err = of_get_mac_address(np, ndev->dev_addr);
+       if (err) {
                netif_err(ag, probe, ndev, "invalid MAC address, using random address\n");
                eth_random_addr(ndev->dev_addr);
        }
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -2420,7 +2420,6 @@ static int bcm_sysport_probe(struct plat
        struct bcm_sysport_priv *priv;
        struct device_node *dn;
        struct net_device *dev;
-       const void *macaddr;
        u32 txq, rxq;
        int ret;
 
@@ -2502,12 +2501,10 @@ static int bcm_sysport_probe(struct plat
        }
 
        /* Initialize netdevice members */
-       macaddr = of_get_mac_address(dn);
-       if (IS_ERR(macaddr)) {
+       ret = of_get_mac_address(dn, dev->dev_addr);
+       if (ret) {
                dev_warn(&pdev->dev, "using random Ethernet MAC\n");
                eth_hw_addr_random(dev);
-       } else {
-               ether_addr_copy(dev->dev_addr, macaddr);
        }
 
        SET_NETDEV_DEV(dev, &pdev->dev);
--- a/drivers/net/ethernet/broadcom/bgmac-bcma.c
+++ b/drivers/net/ethernet/broadcom/bgmac-bcma.c
@@ -115,7 +115,7 @@ static int bgmac_probe(struct bcma_devic
        struct ssb_sprom *sprom = &core->bus->sprom;
        struct mii_bus *mii_bus;
        struct bgmac *bgmac;
-       const u8 *mac = NULL;
+       const u8 *mac;
        int err;
 
        bgmac = bgmac_alloc(&core->dev);
@@ -128,11 +128,10 @@ static int bgmac_probe(struct bcma_devic
 
        bcma_set_drvdata(core, bgmac);
 
-       if (bgmac->dev->of_node)
-               mac = of_get_mac_address(bgmac->dev->of_node);
+       err = of_get_mac_address(bgmac->dev->of_node, bgmac->net_dev->dev_addr);
 
        /* If no MAC address assigned via device tree, check SPROM */
-       if (IS_ERR_OR_NULL(mac)) {
+       if (err) {
                switch (core->core_unit) {
                case 0:
                        mac = sprom->et0mac;
@@ -149,10 +148,9 @@ static int bgmac_probe(struct bcma_devic
                        err = -ENOTSUPP;
                        goto err;
                }
+               ether_addr_copy(bgmac->net_dev->dev_addr, mac);
        }
 
-       ether_addr_copy(bgmac->net_dev->dev_addr, mac);
-
        /* On BCM4706 we need common core to access PHY */
        if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
            !core->bus->drv_gmac_cmn.core) {
--- a/drivers/net/ethernet/broadcom/bgmac-platform.c
+++ b/drivers/net/ethernet/broadcom/bgmac-platform.c
@@ -173,7 +173,7 @@ static int bgmac_probe(struct platform_d
        struct device_node *np = pdev->dev.of_node;
        struct bgmac *bgmac;
        struct resource *regs;
-       const u8 *mac_addr;
+       int ret;
 
        bgmac = bgmac_alloc(&pdev->dev);
        if (!bgmac)
@@ -192,11 +192,10 @@ static int bgmac_probe(struct platform_d
        bgmac->dev = &pdev->dev;
        bgmac->dma_dev = &pdev->dev;
 
-       mac_addr = of_get_mac_address(np);
-       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");
+       ret = of_get_mac_address(np, bgmac->net_dev->dev_addr);
+       if (ret)
+               dev_warn(&pdev->dev,
+                        "MAC address not present in device tree\n");
 
        bgmac->irq = platform_get_irq(pdev, 0);
        if (bgmac->irq < 0)
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4203,7 +4203,6 @@ static int macb_probe(struct platform_de
        struct net_device *dev;
        struct resource *regs;
        void __iomem *mem;
-       const char *mac;
        struct macb *bp;
        int err, val;
 
@@ -4316,15 +4315,11 @@ static int macb_probe(struct platform_de
        if (bp->caps & MACB_CAPS_NEEDS_RSTONUBR)
                bp->rx_intr_mask |= MACB_BIT(RXUBR);
 
-       mac = of_get_mac_address(np);
-       if (PTR_ERR(mac) == -EPROBE_DEFER) {
-               err = -EPROBE_DEFER;
+       err = of_get_mac_address(np, bp->dev->dev_addr);
+       if (err == -EPROBE_DEFER)
                goto err_out_free_netdev;
-       } else if (!IS_ERR_OR_NULL(mac)) {
-               ether_addr_copy(bp->dev->dev_addr, mac);
-       } else {
+       else if (err)
                macb_get_hwaddr(bp);
-       }
 
        err = of_get_phy_mode(np);
        if (err < 0)
--- a/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/cavium/octeon/octeon_mgmt.c
@@ -1391,7 +1391,6 @@ static int octeon_mgmt_probe(struct plat
        struct net_device *netdev;
        struct octeon_mgmt *p;
        const __be32 *data;
-       const u8 *mac;
        struct resource *res_mix;
        struct resource *res_agl;
        struct resource *res_agl_prt_ctl;
@@ -1508,11 +1507,8 @@ static int octeon_mgmt_probe(struct plat
        netdev->min_mtu = 64 - OCTEON_MGMT_RX_HEADROOM;
        netdev->max_mtu = 16383 - OCTEON_MGMT_RX_HEADROOM - VLAN_HLEN;
 
-       mac = of_get_mac_address(pdev->dev.of_node);
-
-       if (!IS_ERR(mac))
-               ether_addr_copy(netdev->dev_addr, mac);
-       else
+       result = of_get_mac_address(pdev->dev.of_node, netdev->dev_addr);
+       if (result)
                eth_hw_addr_random(netdev);
 
        p->phy_np = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -1474,7 +1474,6 @@ static int bgx_init_of_phy(struct bgx *b
        device_for_each_child_node(&bgx->pdev->dev, fwn) {
                struct phy_device *pd;
                struct device_node *phy_np;
-               const char *mac;
 
                /* Should always be an OF node.  But if it is not, we
                 * cannot handle it, so exit the loop.
@@ -1483,9 +1482,7 @@ static int bgx_init_of_phy(struct bgx *b
                if (!node)
                        break;
 
-               mac = of_get_mac_address(node);
-               if (!IS_ERR(mac))
-                       ether_addr_copy(bgx->lmac[lmac].mac, mac);
+               of_get_mac_address(node, bgx->lmac[lmac].mac);
 
                SET_NETDEV_DEV(&bgx->lmac[lmac].netdev, &bgx->pdev->dev);
                bgx->lmac[lmac].lmacid = lmac;
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -1390,7 +1390,7 @@ static struct dm9000_plat_data *dm9000_p
 {
        struct dm9000_plat_data *pdata;
        struct device_node *np = dev->of_node;
-       const void *mac_addr;
+       int ret;
 
        if (!IS_ENABLED(CONFIG_OF) || !np)
                return ERR_PTR(-ENXIO);
@@ -1404,11 +1404,9 @@ static struct dm9000_plat_data *dm9000_p
        if (of_find_property(np, "davicom,no-eeprom", NULL))
                pdata->flags |= DM9000_PLATF_NO_EEPROM;
 
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(pdata->dev_addr, mac_addr);
-       else if (PTR_ERR(mac_addr) == -EPROBE_DEFER)
-               return ERR_CAST(mac_addr);
+       ret = of_get_mac_address(np, pdata->dev_addr);
+       if (ret == -EPROBE_DEFER)
+               return ERR_PTR(ret);
 
        return pdata;
 }
--- a/drivers/net/ethernet/ethoc.c
+++ b/drivers/net/ethernet/ethoc.c
@@ -1147,11 +1147,7 @@ static int ethoc_probe(struct platform_d
                ether_addr_copy(netdev->dev_addr, pdata->hwaddr);
                priv->phy_id = pdata->phy_id;
        } else {
-               const void *mac;
-
-               mac = of_get_mac_address(pdev->dev.of_node);
-               if (!IS_ERR(mac))
-                       ether_addr_copy(netdev->dev_addr, mac);
+               of_get_mac_address(pdev->dev.of_node, netdev->dev_addr);
                priv->phy_id = -1;
        }
 
--- a/drivers/net/ethernet/ezchip/nps_enet.c
+++ b/drivers/net/ethernet/ezchip/nps_enet.c
@@ -575,7 +575,6 @@ static s32 nps_enet_probe(struct platfor
        struct net_device *ndev;
        struct nps_enet_priv *priv;
        s32 err = 0;
-       const char *mac_addr;
 
        if (!dev->of_node)
                return -ENODEV;
@@ -602,10 +601,8 @@ static s32 nps_enet_probe(struct platfor
        dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs_base);
 
        /* set kernel MAC address to dev */
-       mac_addr = of_get_mac_address(dev->of_node);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-       else
+       err = of_get_mac_address(dev->of_node, ndev->dev_addr);
+       if (err)
                eth_hw_addr_random(ndev);
 
        /* Get IRQ number */
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -1695,6 +1695,7 @@ static void fec_get_mac(struct net_devic
        struct fec_enet_private *fep = netdev_priv(ndev);
        struct fec_platform_data *pdata = dev_get_platdata(&fep->pdev->dev);
        unsigned char *iap, tmpaddr[ETH_ALEN];
+       int ret;
 
        /*
         * try to get mac address in following order:
@@ -1710,9 +1711,9 @@ static void fec_get_mac(struct net_devic
        if (!is_valid_ether_addr(iap)) {
                struct device_node *np = fep->pdev->dev.of_node;
                if (np) {
-                       const char *mac = of_get_mac_address(np);
-                       if (!IS_ERR(mac))
-                               iap = (unsigned char *) mac;
+                       ret = of_get_mac_address(np, tmpaddr);
+                       if (!ret)
+                               iap = tmpaddr;
                }
        }
 
--- a/drivers/net/ethernet/freescale/fec_mpc52xx.c
+++ b/drivers/net/ethernet/freescale/fec_mpc52xx.c
@@ -823,7 +823,6 @@ static int mpc52xx_fec_probe(struct plat
        const u32 *prop;
        int prop_size;
        struct device_node *np = op->dev.of_node;
-       const char *mac_addr;
 
        phys_addr_t rx_fifo;
        phys_addr_t tx_fifo;
@@ -901,10 +900,8 @@ static int mpc52xx_fec_probe(struct plat
         *
         * First try to read MAC address from DT
         */
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr)) {
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-       } else {
+       rv = of_get_mac_address(np, ndev->dev_addr);
+       if (rv) {
                struct mpc52xx_fec __iomem *fec = priv->fec;
 
                /*
--- a/drivers/net/ethernet/freescale/fman/mac.c
+++ b/drivers/net/ethernet/freescale/fman/mac.c
@@ -605,7 +605,6 @@ static int mac_probe(struct platform_dev
        struct platform_device  *of_dev;
        struct resource          res;
        struct mac_priv_s       *priv;
-       const u8                *mac_addr;
        u32                      val;
        u8                      fman_id;
        int                     phy_if;
@@ -723,13 +722,12 @@ static int mac_probe(struct platform_dev
        priv->cell_index = (u8)val;
 
        /* Get the MAC address */
-       mac_addr = of_get_mac_address(mac_node);
-       if (IS_ERR(mac_addr)) {
+       err = of_get_mac_address(mac_node, mac_dev->addr);
+       if (err) {
                dev_err(dev, "of_get_mac_address(%pOF) failed\n", mac_node);
                err = -EINVAL;
                goto _return_of_get_parent;
        }
-       ether_addr_copy(mac_dev->addr, mac_addr);
 
        /* Get the port handles */
        nph = of_count_phandle_with_args(mac_node, "fsl,fman-ports", NULL);
--- a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
+++ b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
@@ -925,7 +925,6 @@ static int fs_enet_probe(struct platform
        const u32 *data;
        struct clk *clk;
        int err;
-       const u8 *mac_addr;
        const char *phy_connection_type;
        int privsize, len, ret = -ENODEV;
 
@@ -1013,9 +1012,7 @@ static int fs_enet_probe(struct platform
        spin_lock_init(&fep->lock);
        spin_lock_init(&fep->tx_lock);
 
-       mac_addr = of_get_mac_address(ofdev->dev.of_node);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
+       of_get_mac_address(ofdev->dev.of_node, ndev->dev_addr);
 
        ret = fep->ops->allocate_bd(ndev);
        if (ret)
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -643,7 +643,6 @@ static phy_interface_t gfar_get_interfac
 static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
 {
        const char *model;
-       const void *mac_addr;
        int err = 0, i;
        struct net_device *dev = NULL;
        struct gfar_private *priv = NULL;
@@ -784,10 +783,7 @@ static int gfar_of_init(struct platform_
        if (stash_len || stash_idx)
                priv->device_flags |= FSL_GIANFAR_DEV_HAS_BUF_STASHING;
 
-       mac_addr = of_get_mac_address(np);
-
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(dev->dev_addr, mac_addr);
+       err = of_get_mac_address(np, dev->dev_addr);
 
        if (model && !strcasecmp(model, "TSEC"))
                priv->device_flags |= FSL_GIANFAR_DEV_HAS_GIGABIT |
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c
@@ -3697,7 +3697,6 @@ static int ucc_geth_probe(struct platfor
        int err, ucc_num, max_speed = 0;
        const unsigned int *prop;
        const char *sprop;
-       const void *mac_addr;
        phy_interface_t phy_interface;
        static const int enet_to_speed[] = {
                SPEED_10, SPEED_10, SPEED_10,
@@ -3907,9 +3906,7 @@ static int ucc_geth_probe(struct platfor
                goto err_free_netdev;
        }
 
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(dev->dev_addr, mac_addr);
+       of_get_mac_address(np, dev->dev_addr);
 
        ugeth->ug_info = ug_info;
        ugeth->dev = device;
--- a/drivers/net/ethernet/hisilicon/hisi_femac.c
+++ b/drivers/net/ethernet/hisilicon/hisi_femac.c
@@ -784,7 +784,6 @@ static int hisi_femac_drv_probe(struct p
        struct net_device *ndev;
        struct hisi_femac_priv *priv;
        struct phy_device *phy;
-       const char *mac_addr;
        int ret;
 
        ndev = alloc_etherdev(sizeof(*priv));
@@ -854,10 +853,8 @@ static int hisi_femac_drv_probe(struct p
                           (unsigned long)phy->phy_id,
                           phy_modes(phy->interface));
 
-       mac_addr = of_get_mac_address(node);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-       if (!is_valid_ether_addr(ndev->dev_addr)) {
+       ret = of_get_mac_address(node, ndev->dev_addr);
+       if (ret) {
                eth_hw_addr_random(ndev);
                dev_warn(dev, "using random MAC address %pM\n",
                         ndev->dev_addr);
--- a/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
+++ b/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
@@ -1098,7 +1098,6 @@ static int hix5hd2_dev_probe(struct plat
        struct net_device *ndev;
        struct hix5hd2_priv *priv;
        struct mii_bus *bus;
-       const char *mac_addr;
        int ret;
 
        ndev = alloc_etherdev(sizeof(struct hix5hd2_priv));
@@ -1221,10 +1220,8 @@ static int hix5hd2_dev_probe(struct plat
                goto out_phy_node;
        }
 
-       mac_addr = of_get_mac_address(node);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-       if (!is_valid_ether_addr(ndev->dev_addr)) {
+       ret = of_get_mac_address(node, ndev->dev_addr);
+       if (ret) {
                eth_hw_addr_random(ndev);
                netdev_warn(ndev, "using random MAC address %pM\n",
                            ndev->dev_addr);
--- a/drivers/net/ethernet/lantiq_xrx200.c
+++ b/drivers/net/ethernet/lantiq_xrx200.c
@@ -434,7 +434,6 @@ static int xrx200_probe(struct platform_
        struct resource *res;
        struct xrx200_priv *priv;
        struct net_device *net_dev;
-       const u8 *mac;
        int err;
 
        /* alloc the network device */
@@ -478,10 +477,8 @@ static int xrx200_probe(struct platform_
                return PTR_ERR(priv->clk);
        }
 
-       mac = of_get_mac_address(np);
-       if (!IS_ERR(mac))
-               ether_addr_copy(net_dev->dev_addr, mac);
-       else
+       err = of_get_mac_address(np, net_dev->dev_addr);
+       if (err)
                eth_hw_addr_random(net_dev);
 
        /* bring up the dma engine and IP core */
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2705,7 +2705,6 @@ static int mv643xx_eth_shared_of_add_por
        struct platform_device *ppdev;
        struct mv643xx_eth_platform_data ppd;
        struct resource res;
-       const char *mac_addr;
        int ret;
        int dev_num = 0;
 
@@ -2736,9 +2735,7 @@ static int mv643xx_eth_shared_of_add_por
                return -EINVAL;
        }
 
-       mac_addr = of_get_mac_address(pnp);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ppd.mac_addr, mac_addr);
+       of_get_mac_address(pnp, ppd.mac_addr);
 
        mv643xx_eth_property(pnp, "tx-queue-size", ppd.tx_queue_size);
        mv643xx_eth_property(pnp, "tx-sram-addr", ppd.tx_sram_addr);
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4526,7 +4526,6 @@ static int mvneta_probe(struct platform_
        struct net_device *dev;
        struct phylink *phylink;
        struct phy *comphy;
-       const char *dt_mac_addr;
        char hw_mac_addr[ETH_ALEN];
        const char *mac_from;
        int tx_csum_limit;
@@ -4623,10 +4622,9 @@ static int mvneta_probe(struct platform_
                goto err_free_ports;
        }
 
-       dt_mac_addr = of_get_mac_address(dn);
-       if (!IS_ERR(dt_mac_addr)) {
+       err = of_get_mac_address(dn, dev->dev_addr);
+       if (!err) {
                mac_from = "device tree";
-               ether_addr_copy(dev->dev_addr, dt_mac_addr);
        } else {
                mvneta_get_mac_addr(pp, hw_mac_addr);
                if (is_valid_ether_addr(hw_mac_addr)) {
--- a/drivers/net/ethernet/marvell/pxa168_eth.c
+++ b/drivers/net/ethernet/marvell/pxa168_eth.c
@@ -1402,7 +1402,6 @@ static int pxa168_eth_probe(struct platf
        struct resource *res;
        struct clk *clk;
        struct device_node *np;
-       const unsigned char *mac_addr = NULL;
        int err;
 
        printk(KERN_NOTICE "PXA168 10/100 Ethernet Driver\n");
@@ -1445,12 +1444,8 @@ static int pxa168_eth_probe(struct platf
 
        INIT_WORK(&pep->tx_timeout_task, pxa168_eth_tx_timeout_task);
 
-       if (pdev->dev.of_node)
-               mac_addr = of_get_mac_address(pdev->dev.of_node);
-
-       if (!IS_ERR_OR_NULL(mac_addr)) {
-               ether_addr_copy(dev->dev_addr, mac_addr);
-       } else {
+       err = of_get_mac_address(pdev->dev.of_node, dev->dev_addr);
+       if (err) {
                /* try reading the mac address, if set by the bootloader */
                pxa168_eth_get_mac_address(dev, dev->dev_addr);
                if (!is_valid_ether_addr(dev->dev_addr)) {
--- a/drivers/net/ethernet/marvell/sky2.c
+++ b/drivers/net/ethernet/marvell/sky2.c
@@ -4721,7 +4721,7 @@ static struct net_device *sky2_init_netd
 {
        struct sky2_port *sky2;
        struct net_device *dev = alloc_etherdev(sizeof(*sky2));
-       const void *iap;
+       int ret;
 
        if (!dev)
                return NULL;
@@ -4791,10 +4791,8 @@ static struct net_device *sky2_init_netd
         * 1) from device tree data
         * 2) from internal registers set by bootloader
         */
-       iap = of_get_mac_address(hw->pdev->dev.of_node);
-       if (!IS_ERR(iap))
-               ether_addr_copy(dev->dev_addr, iap);
-       else
+       ret = of_get_mac_address(hw->pdev->dev.of_node, dev->dev_addr);
+       if (ret)
                memcpy_fromio(dev->dev_addr, hw->regs + B2_MAC_1 + port * 8,
                              ETH_ALEN);
 
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2469,14 +2469,11 @@ static int __init mtk_init(struct net_de
 {
        struct mtk_mac *mac = netdev_priv(dev);
        struct mtk_eth *eth = mac->hw;
-       const char *mac_addr;
+       int ret;
 
-       mac_addr = of_get_mac_address(mac->of_node);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(dev->dev_addr, mac_addr);
-
-       /* If the mac address is invalid, use random mac address  */
-       if (!is_valid_ether_addr(dev->dev_addr)) {
+       ret = of_get_mac_address(mac->of_node, dev->dev_addr);
+       if (ret) {
+               /* If the mac address is invalid, use random mac address */
                eth_hw_addr_random(dev);
                dev_err(eth->dev, "generated random MAC address %pM\n",
                        dev->dev_addr);
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1350,9 +1350,7 @@ static int lpc_eth_drv_probe(struct plat
        __lpc_get_mac(pldat, ndev->dev_addr);
 
        if (!is_valid_ether_addr(ndev->dev_addr)) {
-               const char *macaddr = of_get_mac_address(np);
-               if (!IS_ERR(macaddr))
-                       ether_addr_copy(ndev->dev_addr, macaddr);
+               of_get_mac_address(np, ndev->dev_addr);
        }
        if (!is_valid_ether_addr(ndev->dev_addr))
                eth_hw_addr_random(ndev);
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -885,7 +885,7 @@ qca_spi_probe(struct spi_device *spi)
        struct net_device *qcaspi_devs = NULL;
        u8 legacy_mode = 0;
        u16 signature;
-       const char *mac;
+       int ret;
 
        if (!spi->dev.of_node) {
                dev_err(&spi->dev, "Missing device tree\n");
@@ -962,12 +962,8 @@ qca_spi_probe(struct spi_device *spi)
 
        spi_set_drvdata(spi, qcaspi_devs);
 
-       mac = of_get_mac_address(spi->dev.of_node);
-
-       if (!IS_ERR(mac))
-               ether_addr_copy(qca->net_dev->dev_addr, mac);
-
-       if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
+       ret = of_get_mac_address(spi->dev.of_node, qca->net_dev->dev_addr);
+       if (ret) {
                eth_hw_addr_random(qca->net_dev);
                dev_info(&spi->dev, "Using random MAC address: %pM\n",
                         qca->net_dev->dev_addr);
--- a/drivers/net/ethernet/qualcomm/qca_uart.c
+++ b/drivers/net/ethernet/qualcomm/qca_uart.c
@@ -323,7 +323,6 @@ static int qca_uart_probe(struct serdev_
 {
        struct net_device *qcauart_dev = alloc_etherdev(sizeof(struct qcauart));
        struct qcauart *qca;
-       const char *mac;
        u32 speed = 115200;
        int ret;
 
@@ -348,12 +347,8 @@ static int qca_uart_probe(struct serdev_
 
        of_property_read_u32(serdev->dev.of_node, "current-speed", &speed);
 
-       mac = of_get_mac_address(serdev->dev.of_node);
-
-       if (!IS_ERR(mac))
-               ether_addr_copy(qca->net_dev->dev_addr, mac);
-
-       if (!is_valid_ether_addr(qca->net_dev->dev_addr)) {
+       ret = of_get_mac_address(serdev->dev.of_node, qca->net_dev->dev_addr);
+       if (ret) {
                eth_hw_addr_random(qca->net_dev);
                dev_info(&serdev->dev, "Using random MAC address: %pM\n",
                         qca->net_dev->dev_addr);
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -109,11 +109,13 @@ static void ravb_set_buffer_align(struct
  * Ethernet AVB device doesn't have ROM for MAC address.
  * This function gets the MAC address that was used by a bootloader.
  */
-static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac)
+static void ravb_read_mac_address(struct device_node *np,
+                                 struct net_device *ndev)
 {
-       if (!IS_ERR(mac)) {
-               ether_addr_copy(ndev->dev_addr, mac);
-       } else {
+       int ret;
+
+       ret = of_get_mac_address(np, ndev->dev_addr);
+       if (ret) {
                u32 mahr = ravb_read(ndev, MAHR);
                u32 malr = ravb_read(ndev, MALR);
 
@@ -2163,7 +2165,7 @@ static int ravb_probe(struct platform_de
        priv->msg_enable = RAVB_DEF_MSG_ENABLE;
 
        /* Read and set MAC address */
-       ravb_read_mac_address(ndev, of_get_mac_address(np));
+       ravb_read_mac_address(np, ndev);
        if (!is_valid_ether_addr(ndev->dev_addr)) {
                dev_warn(&pdev->dev,
                         "no valid MAC address supplied, using a random one\n");
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -3194,7 +3194,6 @@ static struct sh_eth_plat_data *sh_eth_p
 {
        struct device_node *np = dev->of_node;
        struct sh_eth_plat_data *pdata;
-       const char *mac_addr;
        int ret;
 
        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
@@ -3206,9 +3205,7 @@ static struct sh_eth_plat_data *sh_eth_p
                return NULL;
        pdata->phy_interface = ret;
 
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(pdata->mac_addr, mac_addr);
+       of_get_mac_address(np, pdata->mac_addr);
 
        pdata->no_ether_link =
                of_property_read_bool(np, "renesas,no-ether-link");
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_platform.c
@@ -25,8 +25,7 @@
 
 #ifdef CONFIG_OF
 static int sxgbe_probe_config_dt(struct platform_device *pdev,
-                                struct sxgbe_plat_data *plat,
-                                const char **mac)
+                                struct sxgbe_plat_data *plat)
 {
        struct device_node *np = pdev->dev.of_node;
        struct sxgbe_dma_cfg *dma_cfg;
@@ -34,7 +33,6 @@ static int sxgbe_probe_config_dt(struct
        if (!np)
                return -ENODEV;
 
-       *mac = of_get_mac_address(np);
        plat->interface = of_get_phy_mode(np);
 
        plat->bus_id = of_alias_get_id(np, "ethernet");
@@ -60,8 +58,7 @@ static int sxgbe_probe_config_dt(struct
 }
 #else
 static int sxgbe_probe_config_dt(struct platform_device *pdev,
-                                struct sxgbe_plat_data *plat,
-                                const char **mac)
+                                struct sxgbe_plat_data *plat)
 {
        return -ENOSYS;
 }
@@ -82,7 +79,6 @@ static int sxgbe_platform_probe(struct p
        void __iomem *addr;
        struct sxgbe_priv_data *priv = NULL;
        struct sxgbe_plat_data *plat_dat = NULL;
-       const char *mac = NULL;
        struct net_device *ndev = platform_get_drvdata(pdev);
        struct device_node *node = dev->of_node;
 
@@ -98,7 +94,7 @@ static int sxgbe_platform_probe(struct p
                if (!plat_dat)
                        return  -ENOMEM;
 
-               ret = sxgbe_probe_config_dt(pdev, plat_dat, &mac);
+               ret = sxgbe_probe_config_dt(pdev, plat_dat);
                if (ret) {
                        pr_err("%s: main dt probe failed\n", __func__);
                        return ret;
@@ -119,8 +115,7 @@ static int sxgbe_platform_probe(struct p
        }
 
        /* Get MAC address if available (DT) */
-       if (!IS_ERR_OR_NULL(mac))
-               ether_addr_copy(priv->dev->dev_addr, mac);
+       of_get_mac_address(node, priv->dev->dev_addr);
 
        /* Get the TX/RX IRQ numbers */
        for (i = 0, chan = 1; i < SXGBE_TX_QUEUES; i++) {
--- a/drivers/net/ethernet/socionext/sni_ave.c
+++ b/drivers/net/ethernet/socionext/sni_ave.c
@@ -1559,7 +1559,6 @@ static int ave_probe(struct platform_dev
        struct ave_private *priv;
        struct net_device *ndev;
        struct device_node *np;
-       const void *mac_addr;
        void __iomem *base;
        const char *name;
        int i, irq, ret;
@@ -1600,12 +1599,9 @@ static int ave_probe(struct platform_dev
 
        ndev->max_mtu = AVE_MAX_ETHFRAME - (ETH_HLEN + ETH_FCS_LEN);
 
-       mac_addr = of_get_mac_address(np);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(ndev->dev_addr, mac_addr);
-
-       /* if the mac address is invalid, use random mac address */
-       if (!is_valid_ether_addr(ndev->dev_addr)) {
+       ret = of_get_mac_address(np, ndev->dev_addr);
+       if (ret) {
+               /* if the mac address is invalid, use random mac address */
                eth_hw_addr_random(ndev);
                dev_warn(dev, "Using random MAC address: %pM\n",
                         ndev->dev_addr);
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-anarion.c
@@ -110,7 +110,7 @@ static int anarion_dwmac_probe(struct pl
        if (IS_ERR(gmac))
                return PTR_ERR(gmac);
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
@@ -438,7 +438,7 @@ static int dwc_eth_dwmac_probe(struct pl
        if (IS_ERR(stmmac_res.addr))
                return PTR_ERR(stmmac_res.addr);
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c
@@ -27,7 +27,7 @@ static int dwmac_generic_probe(struct pl
                return ret;
 
        if (pdev->dev.of_node) {
-               plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+               plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
                if (IS_ERR(plat_dat)) {
                        dev_err(&pdev->dev, "dt configuration failed\n");
                        return PTR_ERR(plat_dat);
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -254,7 +254,7 @@ static int ipq806x_gmac_probe(struct pla
        if (val)
                return val;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c
@@ -37,7 +37,7 @@ static int lpc18xx_dwmac_probe(struct pl
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -348,7 +348,7 @@ static int mediatek_dwmac_probe(struct p
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson.c
@@ -52,7 +52,7 @@ static int meson6_dwmac_probe(struct pla
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -324,7 +324,7 @@ static int meson8b_dwmac_probe(struct pl
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-oxnas.c
@@ -118,7 +118,7 @@ static int oxnas_dwmac_probe(struct plat
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -461,7 +461,7 @@ static int qcom_ethqos_probe(struct plat
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat)) {
                dev_err(&pdev->dev, "dt configuration failed\n");
                return PTR_ERR(plat_dat);
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -1396,7 +1396,7 @@ static int rk_gmac_probe(struct platform
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -398,7 +398,7 @@ static int socfpga_dwmac_probe(struct pl
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c
@@ -320,7 +320,7 @@ static int sti_dwmac_probe(struct platfo
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -364,7 +364,7 @@ static int stm32_dwmac_probe(struct plat
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -1127,7 +1127,7 @@ static int sun8i_dwmac_probe(struct plat
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
@@ -108,7 +108,7 @@ static int sun7i_gmac_probe(struct platf
        if (ret)
                return ret;
 
-       plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+       plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);
 
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -25,7 +25,7 @@
 
 struct stmmac_resources {
        void __iomem *addr;
-       const char *mac;
+       u8 mac[ETH_ALEN];
        int wol_irq;
        int lpi_irq;
        int irq;
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4479,7 +4479,7 @@ int stmmac_dvr_probe(struct device *devi
        priv->wol_irq = res->wol_irq;
        priv->lpi_irq = res->lpi_irq;
 
-       if (!IS_ERR_OR_NULL(res->mac))
+       if (!is_zero_ether_addr(res->mac))
                memcpy(priv->dev->dev_addr, res->mac, ETH_ALEN);
 
        dev_set_drvdata(device, priv->dev);
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -393,7 +393,7 @@ static int stmmac_of_get_mac_mode(struct
  * set some private fields that will be used by the main at runtime.
  */
 struct plat_stmmacenet_data *
-stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
+stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 {
        struct device_node *np = pdev->dev.of_node;
        struct plat_stmmacenet_data *plat;
@@ -404,12 +404,12 @@ stmmac_probe_config_dt(struct platform_d
        if (!plat)
                return ERR_PTR(-ENOMEM);
 
-       *mac = of_get_mac_address(np);
-       if (IS_ERR(*mac)) {
-               if (PTR_ERR(*mac) == -EPROBE_DEFER)
-                       return ERR_CAST(*mac);
+       rc = of_get_mac_address(np, mac);
+       if (rc) {
+               if (rc == -EPROBE_DEFER)
+                       return ERR_PTR(rc);
 
-               *mac = NULL;
+               eth_zero_addr(mac);
        }
 
        plat->phy_interface = of_get_phy_mode(np);
@@ -629,7 +629,7 @@ void stmmac_remove_config_dt(struct plat
 }
 #else
 struct plat_stmmacenet_data *
-stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
+stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 {
        return ERR_PTR(-EINVAL);
 }
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
@@ -12,7 +12,7 @@
 #include "stmmac.h"
 
 struct plat_stmmacenet_data *
-stmmac_probe_config_dt(struct platform_device *pdev, const char **mac);
+stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac);
 void stmmac_remove_config_dt(struct platform_device *pdev,
                             struct plat_stmmacenet_data *plat);
 
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -2555,7 +2555,6 @@ static int cpsw_probe_dt(struct cpsw_pla
 
        for_each_available_child_of_node(node, slave_node) {
                struct cpsw_slave_data *slave_data = data->slave_data + i;
-               const void *mac_addr = NULL;
                int lenp;
                const __be32 *parp;
 
@@ -2628,10 +2627,8 @@ static int cpsw_probe_dt(struct cpsw_pla
                }
 
 no_phy_slave:
-               mac_addr = of_get_mac_address(slave_node);
-               if (!IS_ERR(mac_addr)) {
-                       ether_addr_copy(slave_data->mac_addr, mac_addr);
-               } else {
+               ret = of_get_mac_address(slave_node, slave_data->mac_addr);
+               if (ret) {
                        ret = ti_cm_get_macid(&pdev->dev, i,
                                              slave_data->mac_addr);
                        if (ret)
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1686,7 +1686,6 @@ davinci_emac_of_get_pdata(struct platfor
        const struct of_device_id *match;
        const struct emac_platform_data *auxdata;
        struct emac_platform_data *pdata = NULL;
-       const u8 *mac_addr;
 
        if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
                return dev_get_platdata(&pdev->dev);
@@ -1698,11 +1697,8 @@ davinci_emac_of_get_pdata(struct platfor
        np = pdev->dev.of_node;
        pdata->version = EMAC_VERSION_2;
 
-       if (!is_valid_ether_addr(pdata->mac_addr)) {
-               mac_addr = of_get_mac_address(np);
-               if (!IS_ERR(mac_addr))
-                       ether_addr_copy(pdata->mac_addr, mac_addr);
-       }
+       if (!is_valid_ether_addr(pdata->mac_addr))
+               of_get_mac_address(np, pdata->mac_addr);
 
        of_property_read_u32(np, "ti,davinci-ctrl-reg-offset",
                             &pdata->ctrl_reg_offset);
--- a/drivers/net/ethernet/ti/netcp_core.c
+++ b/drivers/net/ethernet/ti/netcp_core.c
@@ -1966,7 +1966,6 @@ static int netcp_create_interface(struct
        struct resource res;
        void __iomem *efuse = NULL;
        u32 efuse_mac = 0;
-       const void *mac_addr;
        u8 efuse_mac_addr[6];
        u32 temp[2];
        int ret = 0;
@@ -2036,10 +2035,8 @@ static int netcp_create_interface(struct
                devm_iounmap(dev, efuse);
                devm_release_mem_region(dev, res.start, size);
        } else {
-               mac_addr = of_get_mac_address(node_interface);
-               if (!IS_ERR(mac_addr))
-                       ether_addr_copy(ndev->dev_addr, mac_addr);
-               else
+               ret = of_get_mac_address(node_interface, ndev->dev_addr);
+               if (ret)
                        eth_random_addr(ndev->dev_addr);
        }
 
--- a/drivers/net/ethernet/wiznet/w5100-spi.c
+++ b/drivers/net/ethernet/wiznet/w5100-spi.c
@@ -423,8 +423,14 @@ static int w5100_spi_probe(struct spi_de
        const struct of_device_id *of_id;
        const struct w5100_ops *ops;
        kernel_ulong_t driver_data;
+       const void *mac = NULL;
+       u8 tmpmac[ETH_ALEN];
        int priv_size;
-       const void *mac = of_get_mac_address(spi->dev.of_node);
+       int ret;
+
+       ret = of_get_mac_address(spi->dev.of_node, tmpmac);
+       if (!ret)
+               mac = tmpmac;
 
        if (spi->dev.of_node) {
                of_id = of_match_device(w5100_of_match, &spi->dev);
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -1157,7 +1157,7 @@ int w5100_probe(struct device *dev, cons
        INIT_WORK(&priv->setrx_work, w5100_setrx_work);
        INIT_WORK(&priv->restart_work, w5100_restart_work);
 
-       if (!IS_ERR_OR_NULL(mac_addr))
+       if (mac_addr)
                memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
        else
                eth_hw_addr_random(ndev);
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -434,7 +434,7 @@ static void temac_do_set_mac_address(str
 
 static int temac_init_mac_address(struct net_device *ndev, const void *address)
 {
-       ether_addr_copy(ndev->dev_addr, address);
+       memcpy(ndev->dev_addr, address, ETH_ALEN);
        if (!is_valid_ether_addr(ndev->dev_addr))
                eth_hw_addr_random(ndev);
        temac_do_set_mac_address(ndev);
@@ -1277,7 +1277,7 @@ static int temac_probe(struct platform_d
        struct temac_local *lp;
        struct net_device *ndev;
        struct resource *res;
-       const void *addr;
+       u8 addr[ETH_ALEN];
        __be32 *p;
        bool little_endian;
        int rc = 0;
@@ -1473,8 +1473,8 @@ static int temac_probe(struct platform_d
 
        if (temac_np) {
                /* Retrieve the MAC address */
-               addr = of_get_mac_address(temac_np);
-               if (IS_ERR(addr)) {
+               rc = of_get_mac_address(temac_np, addr);
+               if (rc) {
                        dev_err(&pdev->dev, "could not find MAC address\n");
                        return -ENODEV;
                }
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1663,7 +1663,7 @@ static int axienet_probe(struct platform
        struct device_node *np;
        struct axienet_local *lp;
        struct net_device *ndev;
-       const void *mac_addr;
+       u8 mac_addr[ETH_ALEN];
        struct resource *ethres;
        u32 value;
 
@@ -1835,13 +1835,14 @@ static int axienet_probe(struct platform
                dev_info(&pdev->dev, "Ethernet core IRQ not defined\n");
 
        /* Retrieve the MAC address */
-       mac_addr = of_get_mac_address(pdev->dev.of_node);
-       if (IS_ERR(mac_addr)) {
-               dev_warn(&pdev->dev, "could not find MAC address property: %ld\n",
-                        PTR_ERR(mac_addr));
-               mac_addr = NULL;
+       ret = of_get_mac_address(pdev->dev.of_node, mac_addr);
+       if (!ret) {
+               axienet_set_mac_address(ndev, mac_addr);
+       } else {
+               dev_warn(&pdev->dev, "could not find MAC address property: %d\n",
+                        ret);
+               axienet_set_mac_address(ndev, NULL);
        }
-       axienet_set_mac_address(ndev, mac_addr);
 
        lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
        lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -1113,7 +1113,6 @@ static int xemaclite_of_probe(struct pla
        struct net_device *ndev = NULL;
        struct net_local *lp = NULL;
        struct device *dev = &ofdev->dev;
-       const void *mac_address;
 
        int rc = 0;
 
@@ -1155,12 +1154,9 @@ static int xemaclite_of_probe(struct pla
        lp->next_rx_buf_to_use = 0x0;
        lp->tx_ping_pong = get_bool(ofdev, "xlnx,tx-ping-pong");
        lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
-       mac_address = of_get_mac_address(ofdev->dev.of_node);
 
-       if (!IS_ERR(mac_address)) {
-               /* Set the MAC address. */
-               ether_addr_copy(ndev->dev_addr, mac_address);
-       } else {
+       rc = of_get_mac_address(ofdev->dev.of_node, ndev->dev_addr);
+       if (rc) {
                dev_warn(dev, "No MAC address found, using random\n");
                eth_hw_addr_random(ndev);
        }
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -618,7 +618,6 @@ static int ath9k_of_init(struct ath_soft
        struct ath_hw *ah = sc->sc_ah;
        struct ath_common *common = ath9k_hw_common(ah);
        enum ath_bus_type bus_type = common->bus_ops->ath_bus_type;
-       const char *mac;
        char eeprom_name[100];
        int ret;
 
@@ -641,9 +640,7 @@ static int ath9k_of_init(struct ath_soft
                ah->ah_flags |= AH_NO_EEP_SWAP;
        }
 
-       mac = of_get_mac_address(np);
-       if (!IS_ERR(mac))
-               ether_addr_copy(common->macaddr, mac);
+       of_get_mac_address(np, common->macaddr);
 
        return 0;
 }
--- a/drivers/net/wireless/mediatek/mt76/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/eeprom.c
@@ -75,17 +75,9 @@ out_put_node:
 void
 mt76_eeprom_override(struct mt76_dev *dev)
 {
-#ifdef CONFIG_OF
        struct device_node *np = dev->dev->of_node;
-       const u8 *mac;
 
-       if (!np)
-               return;
-
-       mac = of_get_mac_address(np);
-       if (!IS_ERR(mac))
-               ether_addr_copy(dev->macaddr, mac);
-#endif
+       of_get_mac_address(np, dev->macaddr);
 
        if (!is_valid_ether_addr(dev->macaddr)) {
                eth_random_addr(dev->macaddr);
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
@@ -990,11 +990,7 @@ static void rt2x00lib_rate(struct ieee80
 
 void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
 {
-       const char *mac_addr;
-
-       mac_addr = of_get_mac_address(rt2x00dev->dev->of_node);
-       if (!IS_ERR(mac_addr))
-               ether_addr_copy(eeprom_mac_addr, mac_addr);
+       of_get_mac_address(rt2x00dev->dev->of_node, eeprom_mac_addr);
 
        if (!is_valid_ether_addr(eeprom_mac_addr)) {
                eth_random_addr(eeprom_mac_addr);
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -39,37 +39,29 @@ int of_get_phy_mode(struct device_node *
 }
 EXPORT_SYMBOL_GPL(of_get_phy_mode);
 
-static const void *of_get_mac_addr(struct device_node *np, const char *name)
+static int of_get_mac_addr(struct device_node *np, const char *name, u8 *addr)
 {
        struct property *pp = of_find_property(np, name, NULL);
 
-       if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value))
-               return pp->value;
-       return NULL;
+       if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) {
+               memcpy(addr, pp->value, ETH_ALEN);
+               return 0;
+       }
+       return -ENODEV;
 }
 
-static const void *of_get_mac_addr_nvmem(struct device_node *np)
+static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
 {
-       int ret;
-       const void *mac;
-       u8 nvmem_mac[ETH_ALEN];
        struct platform_device *pdev = of_find_device_by_node(np);
+       int ret;
 
        if (!pdev)
-               return ERR_PTR(-ENODEV);
+               return -ENODEV;
 
-       ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac);
-       if (ret) {
-               put_device(&pdev->dev);
-               return ERR_PTR(ret);
-       }
-
-       mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL);
+       ret = nvmem_get_mac_address(&pdev->dev, addr);
        put_device(&pdev->dev);
-       if (!mac)
-               return ERR_PTR(-ENOMEM);
 
-       return mac;
+       return ret;
 }
 
 /**
@@ -92,24 +84,27 @@ static const void *of_get_mac_addr_nvmem
  * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
  * but is all zeros.
  *
- * Return: Will be a valid pointer on success and ERR_PTR in case of error.
+ * Return: 0 on success and errno in case of error.
 */
-const void *of_get_mac_address(struct device_node *np)
+int of_get_mac_address(struct device_node *np, u8 *addr)
 {
-       const void *addr;
-
-       addr = of_get_mac_addr(np, "mac-address");
-       if (addr)
-               return addr;
+       int ret;
 
-       addr = of_get_mac_addr(np, "local-mac-address");
-       if (addr)
-               return addr;
+       if (!np)
+               return -ENODEV;
 
-       addr = of_get_mac_addr(np, "address");
-       if (addr)
-               return addr;
+       ret = of_get_mac_addr(np, "mac-address", addr);
+       if (!ret)
+               return 0;
+
+       ret = of_get_mac_addr(np, "local-mac-address", addr);
+       if (!ret)
+               return 0;
+
+       ret = of_get_mac_addr(np, "address", addr);
+       if (!ret)
+               return 0;
 
-       return of_get_mac_addr_nvmem(np);
+       return of_get_mac_addr_nvmem(np, addr);
 }
 EXPORT_SYMBOL(of_get_mac_address);
--- a/drivers/staging/octeon/ethernet.c
+++ b/drivers/staging/octeon/ethernet.c
@@ -407,14 +407,10 @@ static int cvm_oct_common_set_mac_addres
 int cvm_oct_common_init(struct net_device *dev)
 {
        struct octeon_ethernet *priv = netdev_priv(dev);
-       const u8 *mac = NULL;
+       int ret;
 
-       if (priv->of_node)
-               mac = of_get_mac_address(priv->of_node);
-
-       if (!IS_ERR_OR_NULL(mac))
-               ether_addr_copy(dev->dev_addr, mac);
-       else
+       ret = of_get_mac_address(priv->of_node, dev->dev_addr);
+       if (ret)
                eth_hw_addr_random(dev);
 
        /*
--- a/include/linux/of_net.h
+++ b/include/linux/of_net.h
@@ -11,7 +11,7 @@
 
 struct net_device;
 extern int of_get_phy_mode(struct device_node *np);
-extern const void *of_get_mac_address(struct device_node *np);
+extern int of_get_mac_address(struct device_node *np, u8 *mac);
 extern struct net_device *of_find_net_device_by_node(struct device_node *np);
 #else
 static inline int of_get_phy_mode(struct device_node *np)
@@ -19,9 +19,9 @@ static inline int of_get_phy_mode(struct
        return -ENODEV;
 }
 
-static inline const void *of_get_mac_address(struct device_node *np)
+static inline int of_get_mac_address(struct device_node *np, u8 *mac)
 {
-       return ERR_PTR(-ENODEV);
+       return -ENODEV;
 }
 
 static inline struct net_device *of_find_net_device_by_node(struct device_node *np)
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -186,7 +186,7 @@ struct dsa_port {
        unsigned int            index;
        const char              *name;
        struct dsa_port         *cpu_dp;
-       const char              *mac;
+       u8                      mac[ETH_ALEN];
        struct device_node      *dn;
        unsigned int            ageing_time;
        bool                    vlan_filtering;
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -318,7 +318,7 @@ static int dsa_port_setup(struct dsa_por
                        break;
                devlink_port_registered = true;
 
-               dp->mac = of_get_mac_address(dp->dn);
+               of_get_mac_address(dp->dn, dp->mac);
                err = dsa_slave_create(dp);
                if (err)
                        break;
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1411,7 +1411,7 @@ int dsa_slave_create(struct dsa_port *po
        slave_dev->hw_features |= NETIF_F_HW_TC;
        slave_dev->features |= NETIF_F_LLTX;
        slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
-       if (!IS_ERR_OR_NULL(port->mac))
+       if (!is_zero_ether_addr(port->mac))
                ether_addr_copy(slave_dev->dev_addr, port->mac);
        else
                eth_hw_addr_inherit(slave_dev, master);
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -550,13 +550,14 @@ unsigned char * __weak arch_get_platform
 
 int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
 {
-       const unsigned char *addr = NULL;
+       unsigned char *addr;
+       int ret;
 
-       if (dev->of_node)
-               addr = of_get_mac_address(dev->of_node);
-       if (IS_ERR_OR_NULL(addr))
-               addr = arch_get_platform_mac_address();
+       ret = of_get_mac_address(dev->of_node, mac_addr);
+       if (!ret)
+               return 0;
 
+       addr = arch_get_platform_mac_address();
        if (!addr)
                return -ENODEV;