atmel: use eth_hw_addr_set()

Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

Use a buffer on the stack. Note that atmel_get_mib() is a wrapper
around atmel_copy_to_host(). For the to device direction we just
need to make sure functions respect argument being cost.

Signed-off-by: Jakub Kicinski <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/net/wireless/atmel/atmel.c

···
 static void atmel_set_mib16(struct atmel_private *priv, u8 type, u8 index,
 			    u16 data);
 static void atmel_set_mib(struct atmel_private *priv, u8 type, u8 index,
-			  u8 *data, int data_len);
+			  const u8 *data, int data_len);
 static void atmel_get_mib(struct atmel_private *priv, u8 type, u8 index,
 			  u8 *data, int data_len);
 static void atmel_scan(struct atmel_private *priv, int specific_ssid);
···
 {
 	int rc = 0;
 	struct atmel_private *priv = netdev_priv(dev);
+	u8 addr[ETH_ALEN] = {};
 
 	/* reset pccard */
 	if (priv->bus_type == BUS_TYPE_PCCARD)
···
 		if (i == 0) {
 			printk(KERN_ALERT "%s: MAC failed to boot MAC address reader.\n", dev->name);
 		} else {
-			atmel_copy_to_host(dev, dev->dev_addr, atmel_read16(dev, MR2), 6);
+
+			atmel_copy_to_host(dev, addr, atmel_read16(dev, MR2), 6);
+			eth_hw_addr_set(dev, addr);
 			/* got address, now squash it again until the network
 			   interface is opened */
 			if (priv->bus_type == BUS_TYPE_PCCARD)
···
 		/* Mac address easy in this case. */
 		priv->card_type = CARD_TYPE_PARALLEL_FLASH;
 		atmel_write16(dev,  BSR, 1);
-		atmel_copy_to_host(dev, dev->dev_addr, 0xc000, 6);
+		atmel_copy_to_host(dev, addr, 0xc000, 6);
+		eth_hw_addr_set(dev, addr);
 		atmel_write16(dev,  BSR, 0x200);
 		rc = 1;
 	} else {
···
 		   for the Mac Address */
 		priv->card_type = CARD_TYPE_SPI_FLASH;
 		if (atmel_wakeup_firmware(priv) == 0) {
-			atmel_get_mib(priv, Mac_Address_Mib_Type, 0, dev->dev_addr, 6);
+			atmel_get_mib(priv, Mac_Address_Mib_Type, 0, addr, 6);
+			eth_hw_addr_set(dev, addr);
 
 			/* got address, now squash it again until the network
 			   interface is opened */
···
 }
 
 static void atmel_set_mib(struct atmel_private *priv, u8 type, u8 index,
-			  u8 *data, int data_len)
+			  const u8 *data, int data_len)
 {
 	struct get_set_mib m;
 	m.type = type;