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authorThomas Chou <thomas@wytron.com.tw>2009-10-05 01:33:19 +0200
committerDavid S. Miller <davem@davemloft.net>2009-10-07 12:50:12 +0200
commit050f91dcd9a45a14449dded5180f633692b588d2 (patch)
tree93b1b4c4bcd43b70a08e68fd1b9ae313a5fd559e
parentethoc: fix buffer address mapping (diff)
downloadlinux-050f91dcd9a45a14449dded5180f633692b588d2.tar.xz
linux-050f91dcd9a45a14449dded5180f633692b588d2.zip
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>
-rw-r--r--drivers/net/ethoc.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index f92747fc5f8b..0c6c7f47ace4 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -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);