net: remove single-byte netdev->dev_addr writes

Make the drivers which use single-byte netdev addresses
(netdev->addr_len == 1) use the appropriate address setting
helpers.

arcnet copies from int variables and io reads a lot, so
add a helper for arcnet drivers to use.

Similar helper could be reused for phonet and appletalk
but there isn't any good central location where we could
put it, and netdevice.h is already very crowded.

Acked-by: Sebastian Reichel <[e-mail]> # for HSI
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/hsi/clients/ssi_protocol.c

···
 
 static void ssip_pn_setup(struct net_device *dev)
 {
+	static const u8 addr = PN_MEDIA_SOS;
+
 	dev->features		= 0;
 	dev->netdev_ops		= &ssip_pn_ops;
 	dev->type		= ARPHRD_PHONET;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
 	dev->mtu		= SSIP_DEFAULT_MTU;
 	dev->hard_header_len	= 1;
-	dev->dev_addr[0]	= PN_MEDIA_SOS;
 	dev->addr_len		= 1;
+	dev_addr_set(dev, &addr);
 	dev->tx_queue_len	= SSIP_TXQUEUE_LEN;
 
 	dev->needs_free_netdev	= true;

drivers/net/appletalk/cops.c

···
                         dev->broadcast[0]       = 0xFF;
 			
 			/* Set hardware address. */
-                        dev->dev_addr[0]        = aa->s_node;
                         dev->addr_len           = 1;
+			dev_addr_set(dev, &aa->s_node);
                         return 0;
 
                 case SIOCGIFADDR:

drivers/net/appletalk/ltpc.c

···
 			set_30 (dev,ltflags);  
 
 			dev->broadcast[0] = 0xFF;
-			dev->dev_addr[0] = aa->s_node;
-
 			dev->addr_len=1;
+			dev_addr_set(dev, &aa->s_node);
    
 			return 0;
 

drivers/net/arcnet/arc-rimi.c

···
 	}
 
 	/* get and check the station ID from offset 1 in shmem */
-	dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION);
+	arcnet_set_addr(dev, arcnet_readb(lp->mem_start,
+					  COM9026_REG_R_STATION));
 
 	arc_printk(D_NORMAL, dev, "ARCnet RIM I: station %02Xh found at IRQ %d, ShMem %lXh (%ld*%d bytes)\n",
 		   dev->dev_addr[0],
···
 		return -ENOMEM;
 
 	if (node && node != 0xff)
-		dev->dev_addr[0] = node;
+		arcnet_set_addr(dev, node);
 
 	dev->mem_start = io;
 	dev->irq = irq;

drivers/net/arcnet/arcdevice.h

···
 			       struct net_device *dev);
 void arcnet_timeout(struct net_device *dev, unsigned int txqueue);
 
+static inline void arcnet_set_addr(struct net_device *dev, u8 addr)
+{
+	dev_addr_set(dev, &addr);
+}
+
 /* I/O equivalents */
 
 #ifdef CONFIG_SA1100_CT6001

drivers/net/arcnet/com20020-isa.c

···
 		return -ENOMEM;
 
 	if (node && node != 0xff)
-		dev->dev_addr[0] = node;
+		arcnet_set_addr(dev, node);
 
 	dev->netdev_ops = &com20020_netdev_ops;
 

drivers/net/arcnet/com20020-pci.c

···
 
 		SET_NETDEV_DEV(dev, &pdev->dev);
 		dev->base_addr = ioaddr;
-		dev->dev_addr[0] = node;
+		arcnet_set_addr(dev, node);
 		dev->sysfs_groups[0] = &com20020_state_group;
 		dev->irq = pdev->irq;
 		lp->card_name = "PCI COM20020";

drivers/net/arcnet/com20020.c

···
 	struct arcnet_local *lp = netdev_priv(dev);
 	struct sockaddr *hwaddr = addr;
 
-	memcpy(dev->dev_addr, hwaddr->sa_data, 1);
+	dev_addr_set(dev, hwaddr->sa_data);
 	com20020_set_subaddress(lp, ioaddr, SUB_NODE);
 	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);
 
···
 
 	/* FIXME: do this some other way! */
 	if (!dev->dev_addr[0])
-		dev->dev_addr[0] = arcnet_inb(ioaddr, 8);
+		arcnet_set_addr(dev, arcnet_inb(ioaddr, 8));
 
 	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);

drivers/net/arcnet/com20020_cs.c

···
 	lp->hw.owner = THIS_MODULE;
 
 	/* fill in our module parameters as defaults */
-	dev->dev_addr[0] = node;
+	arcnet_set_addr(dev, node);
 
 	p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 	p_dev->resource[0]->end = 16;

drivers/net/arcnet/com90io.c

···
 
 	/* get and check the station ID from offset 1 in shmem */
 
-	dev->dev_addr[0] = get_buffer_byte(dev, 1);
+	arcnet_set_addr(dev, get_buffer_byte(dev, 1));
 
 	err = register_netdev(dev);
 	if (err) {

drivers/net/arcnet/com90xx.c

···
 	}
 
 	/* get and check the station ID from offset 1 in shmem */
-	dev->dev_addr[0] = arcnet_readb(lp->mem_start, COM9026_REG_R_STATION);
+	arcnet_set_addr(dev, arcnet_readb(lp->mem_start,
+					  COM9026_REG_R_STATION));
 
 	dev->base_addr = ioaddr;
 

drivers/net/usb/cdc-phonet.c

···
 
 static void usbpn_setup(struct net_device *dev)
 {
+	const u8 addr = PN_MEDIA_USB;
+
 	dev->features		= 0;
 	dev->netdev_ops		= &usbpn_ops;
 	dev->header_ops		= &phonet_header_ops;
···
 	dev->min_mtu		= PHONET_MIN_MTU;
 	dev->max_mtu		= PHONET_MAX_MTU;
 	dev->hard_header_len	= 1;
-	dev->dev_addr[0]	= PN_MEDIA_USB;
 	dev->addr_len		= 1;
+	dev_addr_set(dev, &addr);
 	dev->tx_queue_len	= 3;
 
 	dev->needs_free_netdev	= true;

drivers/usb/gadget/function/f_phonet.c

···
 
 static void pn_net_setup(struct net_device *dev)
 {
+	const u8 addr = PN_MEDIA_USB;
+
 	dev->features		= 0;
 	dev->type		= ARPHRD_PHONET;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
···
 	dev->min_mtu		= PHONET_MIN_MTU;
 	dev->max_mtu		= PHONET_MAX_MTU;
 	dev->hard_header_len	= 1;
-	dev->dev_addr[0]	= PN_MEDIA_USB;
 	dev->addr_len		= 1;
+	dev_addr_set(dev, &addr);
+
 	dev->tx_queue_len	= 1;
 
 	dev->netdev_ops		= &pn_netdev_ops;