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authorEric Dumazet <edumazet@google.com>2017-04-19 09:59:26 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-20 10:13:23 +0100
commit49cf68d70f47d951c9053d769d3976d9e1be1a25 (patch)
treec22a6343c276b9ffde2f52c28006a6caff029f81
parent4307a871ce5778ff1f994ad24b3c3ec97efeaf16 (diff)
kaweth: use skb_cow_head() to deal with cloned skbs
commit 39fba7835aacda65284a86e611774cbba71dac20 upstream. 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: Eric Dumazet <edumazet@google.com> Cc: James Hughes <james.hughes@raspberrypi.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/usb/kaweth.c18
1 files changed, 6 insertions, 12 deletions
diff --git a/drivers/net/usb/kaweth.c b/drivers/net/usb/kaweth.c
index cd93220c9b45..a628db738b8a 100644
--- a/drivers/net/usb/kaweth.c
+++ b/drivers/net/usb/kaweth.c
@@ -812,18 +812,12 @@ 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);
- dev_kfree_skb_irq(skb);
- skb = copied_skb;
- if (!copied_skb) {
- kaweth->stats.tx_errors++;
- netif_start_queue(net);
- spin_unlock_irq(&kaweth->device_lock);
- return NETDEV_TX_OK;
- }
+ if (skb_cow_head(skb, 2)) {
+ kaweth->stats.tx_errors++;
+ netif_start_queue(net);
+ spin_unlock_irq(&kaweth->device_lock);
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
}
private_header = (__le16 *)__skb_push(skb, 2);