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ethoc: align received packet to make IP header at word boundary 

The packet buffer is allocated at 4 bytes boundary, but the IP header
length and version bits is located at byte 14. These bit fields access
as 32 bits word and caused exception on processors that do not support
unaligned access.

The patch adds 2 bytes offset to make the bit fields word aligned.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Chou 2009-10-04 23:33:19 +00:00 committed by David S. Miller
parent 3ee19a85bb
commit 050f91dcd9
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethoc.c
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@ -399,6 +399,10 @@ static int ethoc_rx(struct net_device *dev, int limit)
if (ethoc_update_rx_stats(priv, &bd) == 0) {
int size = bd.stat >> 16;
struct sk_buff *skb = netdev_alloc_skb(dev, size);
size -= 4; /* strip the CRC */
skb_reserve(skb, 2); /* align TCP/IP header */
if (likely(skb)) {
void *src = phys_to_virt(bd.addr);
memcpy_fromio(skb_put(skb, size), src, size);