Commit 39fba783 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

kaweth: use skb_cow_head() to deal with cloned skbs

We can use skb_cow_head() to properly deal with clones,
especially the ones coming from TCP stack that allow their head being
modified. This avoids a copy.
Signed-off-by: default avatarEric Dumazet <>
Cc: James Hughes <>
Signed-off-by: default avatarDavid S. Miller <>
parent 6bc6895b
......@@ -803,19 +803,13 @@ static netdev_tx_t kaweth_start_xmit(struct sk_buff *skb,
/* We now decide whether we can put our special header into the sk_buff */
if (skb_cloned(skb) || skb_headroom(skb) < 2) {
/* no such luck - we make our own */
struct sk_buff *copied_skb;
copied_skb = skb_copy_expand(skb, 2, 0, GFP_ATOMIC);
skb = copied_skb;
if (!copied_skb) {
if (skb_cow_head(skb, 2)) {
return NETDEV_TX_OK;
private_header = (__le16 *)__skb_push(skb, 2);
*private_header = cpu_to_le16(skb->len-2);
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