net/enc28j60: oops fix

Prevent oops on enc28j60 packet RX:  make sure buffers are aligned.
Not all architectures support unaligned accesses in kernel space.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Claudio Lanconelli <lanconelli.claudio@eptar.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/enc28j60.c

@@ -900,14 +900,15 @@ static void enc28j60_hw_rx(struct net_device *ndev)
 		if (RSV_GETBIT(rxstat, RSV_LENCHECKERR))
 			ndev->stats.rx_frame_errors++;
 	} else {
-		skb = dev_alloc_skb(len);
+		skb = dev_alloc_skb(len + NET_IP_ALIGN);
 		if (!skb) {
 			if (netif_msg_rx_err(priv))
 				dev_err(&ndev->dev,
 					"out of memory for Rx'd frame\n");
 			ndev->stats.rx_dropped++;
 		} else {
 			skb->dev = ndev;
+			skb_reserve(skb, NET_IP_ALIGN);
 			/* copy the packet from the receive buffer */
 			enc28j60_mem_read(priv, priv->next_pk_ptr + sizeof(rsv),
 					len, skb_put(skb, len));