eth: fwnode: change the return type of mac address helpers

fwnode_get_mac_address() and device_get_mac_address()
return a pointer to the buffer that was passed to them
on success or NULL on failure. None of the callers
care about the actual value, only if it's NULL or not.

These semantics differ from of_get_mac_address() which
returns an int so to avoid confusion make the device
helpers return an errno.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

10 files changed, 16 insertions, 18 deletions

diff --git a/drivers/net/ethernet/apm/xgene-v2/main.c b/drivers/net/ethernet/apm/xgene-v2/main.c
index 80399c8980bd..c7253ecc0fa5 100644
--- a/drivers/net/ethernet/apm/xgene-v2/main.c
+++ b/drivers/net/ethernet/apm/xgene-v2/main.c
@@ -36,7 +36,7 @@ static int xge_get_resources(struct xge_pdata *pdata)
 		return -ENOMEM;
 	}
 
-	if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
+	if (device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
 		eth_hw_addr_random(ndev);
 
 	memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
index 5f1fc6582d74..268e099aa5e1 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
@@ -1731,7 +1731,7 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
 		xgene_get_port_id_acpi(dev, pdata);
 #endif
 
-	if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
+	if (device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
 		eth_hw_addr_random(ndev);
 
 	memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 02fe98cbabb0..30c5dcaea802 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -4084,7 +4084,7 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	if (pd && !IS_ERR_OR_NULL(pd->mac_address))
 		eth_hw_addr_set(dev, pd->mac_address);
 	else
-		if (!device_get_mac_address(&pdev->dev, dev->dev_addr, ETH_ALEN))
+		if (device_get_mac_address(&pdev->dev, dev->dev_addr, ETH_ALEN))
 			if (has_acpi_companion(&pdev->dev))
 				bcmgenet_get_hw_addr(priv, dev->dev_addr);
 
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index db66d4beb28a..77ce81633cdc 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -1387,10 +1387,10 @@ static int acpi_get_mac_address(struct device *dev, struct acpi_device *adev,
 				u8 *dst)
 {
 	u8 mac[ETH_ALEN];
-	u8 *addr;
+	int ret;
 
-	addr = fwnode_get_mac_address(acpi_fwnode_handle(adev), mac, ETH_ALEN);
-	if (!addr) {
+	ret = fwnode_get_mac_address(acpi_fwnode_handle(adev), mac, ETH_ALEN);
+	if (ret) {
 		dev_err(dev, "MAC address invalid: %pM\n", mac);
 		return -EINVAL;
 	}
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index ab9267225573..8de9c99a18fb 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -182,10 +182,8 @@ static void ftgmac100_initial_mac(struct ftgmac100 *priv)
 	u8 mac[ETH_ALEN];
 	unsigned int m;
 	unsigned int l;
-	void *addr;
 
-	addr = device_get_mac_address(priv->dev, mac, ETH_ALEN);
-	if (addr) {
+	if (!device_get_mac_address(priv->dev, mac, ETH_ALEN)) {
 		eth_hw_addr_set(priv->netdev, mac);
 		dev_info(priv->dev, "Read MAC address %pM from device tree\n",
 			 mac);
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index 2c4801e49aa1..12b916399ba7 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -1212,7 +1212,7 @@ static void hns_init_mac_addr(struct net_device *ndev)
 {
 	struct hns_nic_priv *priv = netdev_priv(ndev);
 
-	if (!device_get_mac_address(priv->dev, ndev->dev_addr, ETH_ALEN)) {
+	if (device_get_mac_address(priv->dev, ndev->dev_addr, ETH_ALEN)) {
 		eth_hw_addr_random(ndev);
 		dev_warn(priv->dev, "No valid mac, use random mac %pM",
 			 ndev->dev_addr);
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 3197526455d9..b84f8b6fe9f4 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -6081,7 +6081,7 @@ static void mvpp2_port_copy_mac_addr(struct net_device *dev, struct mvpp2 *priv,
 	char hw_mac_addr[ETH_ALEN] = {0};
 	char fw_mac_addr[ETH_ALEN];
 
-	if (fwnode_get_mac_address(fwnode, fw_mac_addr, ETH_ALEN)) {
+	if (!fwnode_get_mac_address(fwnode, fw_mac_addr, ETH_ALEN)) {
 		*mac_from = "firmware node";
 		eth_hw_addr_set(dev, fw_mac_addr);
 		return;
diff --git a/drivers/net/ethernet/microchip/enc28j60.c b/drivers/net/ethernet/microchip/enc28j60.c
index bf77e8adffbf..fa62311d326a 100644
--- a/drivers/net/ethernet/microchip/enc28j60.c
+++ b/drivers/net/ethernet/microchip/enc28j60.c
@@ -1572,7 +1572,7 @@ static int enc28j60_probe(struct spi_device *spi)
 		goto error_irq;
 	}
 
-	if (device_get_mac_address(&spi->dev, macaddr, sizeof(macaddr)))
+	if (!device_get_mac_address(&spi->dev, macaddr, sizeof(macaddr)))
 		eth_hw_addr_set(dev, macaddr);
 	else
 		eth_hw_addr_random(dev);
diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c
index fbfabfc5cc51..2e913508fbeb 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -549,7 +549,7 @@ static int emac_probe_resources(struct platform_device *pdev,
 	int ret = 0;
 
 	/* get mac address */
-	if (device_get_mac_address(&pdev->dev, maddr, ETH_ALEN))
+	if (!device_get_mac_address(&pdev->dev, maddr, ETH_ALEN))
 		eth_hw_addr_set(netdev, maddr);
 	else
 		eth_hw_addr_random(netdev);
diff --git a/drivers/net/ethernet/socionext/netsec.c b/drivers/net/ethernet/socionext/netsec.c
index c7e56dc0a494..f8dd7fa5f632 100644
--- a/drivers/net/ethernet/socionext/netsec.c
+++ b/drivers/net/ethernet/socionext/netsec.c
@@ -1978,10 +1978,10 @@ static int netsec_register_mdio(struct netsec_priv *priv, u32 phy_addr)
 static int netsec_probe(struct platform_device *pdev)
 {
 	struct resource *mmio_res, *eeprom_res, *irq_res;
-	u8 *mac, macbuf[ETH_ALEN];
 	struct netsec_priv *priv;
 	u32 hw_ver, phy_addr = 0;
 	struct net_device *ndev;
+	u8 macbuf[ETH_ALEN];
 	int ret;
 
 	mmio_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -2034,12 +2034,12 @@ static int netsec_probe(struct platform_device *pdev)
 		goto free_ndev;
 	}
 
-	mac = device_get_mac_address(&pdev->dev, macbuf, sizeof(macbuf));
-	if (mac)
-		eth_hw_addr_set(ndev, mac);
+	ret = device_get_mac_address(&pdev->dev, macbuf, sizeof(macbuf));
+	if (!ret)
+		eth_hw_addr_set(ndev, macbuf);
 
 	if (priv->eeprom_base &&
-	    (!mac || !is_valid_ether_addr(ndev->dev_addr))) {
+	    (ret || !is_valid_ether_addr(ndev->dev_addr))) {
 		void __iomem *macp = priv->eeprom_base +
 					NETSEC_EEPROM_MAC_ADDRESS;