usbb: catc: use correct API for MAC addresses

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.

In the case of catc we need a new temporary buffer to conform
to the rules for DMA coherency. That in turn necessitates
a reworking of error handling in probe().

Signed-off-by: Oliver Neukum <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/usb/catc.c

···
 	struct net_device *netdev;
 	struct catc *catc;
 	u8 broadcast[ETH_ALEN];
-	int pktsz, ret;
+	u8 *macbuf;
+	int pktsz, ret = -ENOMEM;
+
+	macbuf = kmalloc(ETH_ALEN, GFP_KERNEL);
+	if (!macbuf)
+		goto error;
 
 	if (usb_set_interface(usbdev,
 			intf->altsetting->desc.bInterfaceNumber, 1)) {
 		dev_err(dev, "Can't set altsetting 1.\n");
-		return -EIO;
+		ret = -EIO;
+		goto fail_mem;;
 	}
 
 	netdev = alloc_etherdev(sizeof(struct catc));
 	if (!netdev)
-		return -ENOMEM;
+		goto fail_mem;
 
 	catc = netdev_priv(netdev);
 
···
 	  
 		dev_dbg(dev, "Getting MAC from SEEROM.\n");
 	  
-		catc_get_mac(catc, netdev->dev_addr);
+		catc_get_mac(catc, macbuf);
+		eth_hw_addr_set(netdev, macbuf);
 		
 		dev_dbg(dev, "Setting MAC into registers.\n");
 	  
···
 	} else {
 		dev_dbg(dev, "Performing reset\n");
 		catc_reset(catc);
-		catc_get_mac(catc, netdev->dev_addr);
+		catc_get_mac(catc, macbuf);
+		eth_hw_addr_set(netdev, macbuf);
 		
 		dev_dbg(dev, "Setting RX Mode\n");
 		catc->rxmode[0] = RxEnable | RxPolarity | RxMultiCast;
···
 	if (ret)
 		goto fail_clear_intfdata;
 
+	kfree(macbuf);
 	return 0;
 
 fail_clear_intfdata:
···
 	usb_free_urb(catc->rx_urb);
 	usb_free_urb(catc->irq_urb);
 	free_netdev(netdev);
+fail_mem:
+	kfree(macbuf);
+error:
 	return ret;
 }