r8169: more alignment for the 0x8168

Two thirds of packets are lost because of misalignment. Users of
Asus laptop did apparently not notice it.

Reported on Gigabyte GA-945GM-S2.

Fix for http://bugzilla.kernel.org/show_bug.cgi?id=7517

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

drivers/net/r8169.c

@@ -2018,7 +2018,7 @@ static int rtl8169_alloc_rx_skb(struct pci_dev *pdev, struct sk_buff **sk_buff,
 	if (!skb)
 		goto err_out;
 
-	skb_reserve(skb, align);
+	skb_reserve(skb, (align - 1) & (u32)skb->data);
 	*sk_buff = skb;
 
 	mapping = pci_map_single(pdev, skb->data, rx_buf_sz,
@@ -2486,7 +2486,7 @@ static inline int rtl8169_try_rx_copy(struct sk_buff **sk_buff, int pkt_size,
 
 		skb = dev_alloc_skb(pkt_size + align);
 		if (skb) {
-			skb_reserve(skb, align);
+			skb_reserve(skb, (align - 1) & (u32)skb->data);
 			eth_copy_and_sum(skb, sk_buff[0]->data, pkt_size, 0);
 			*sk_buff = skb;
 			rtl8169_mark_to_asic(desc, rx_buf_sz);