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-rw-r--r--drivers/net/pppoe.c50
1 files changed, 13 insertions, 37 deletions
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 5ac3eff6a2a..8818253102f 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -850,9 +850,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
struct net_device *dev = po->pppoe_dev;
struct pppoe_hdr hdr;
struct pppoe_hdr *ph;
- int headroom = skb_headroom(skb);
int data_len = skb->len;
- struct sk_buff *skb2;
if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
goto abort;
@@ -866,53 +864,31 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
if (!dev)
goto abort;
- /* Copy the skb if there is no space for the header. */
- if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) {
- skb2 = dev_alloc_skb(32+skb->len +
- sizeof(struct pppoe_hdr) +
- dev->hard_header_len);
-
- if (skb2 == NULL)
- goto abort;
-
- skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr));
- skb_copy_from_linear_data(skb, skb_put(skb2, skb->len),
- skb->len);
- } else {
- /* Make a clone so as to not disturb the original skb,
- * give dev_queue_xmit something it can free.
- */
- skb2 = skb_clone(skb, GFP_ATOMIC);
-
- if (skb2 == NULL)
- goto abort;
- }
+ /* Copy the data if there is no space for the header or if it's
+ * read-only.
+ */
+ if (skb_cow(skb, sizeof(*ph) + dev->hard_header_len))
+ goto abort;
- ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr));
+ ph = (struct pppoe_hdr *) skb_push(skb, sizeof(struct pppoe_hdr));
memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
- skb2->protocol = __constant_htons(ETH_P_PPP_SES);
+ skb->protocol = __constant_htons(ETH_P_PPP_SES);
- skb_reset_network_header(skb2);
+ skb_reset_network_header(skb);
- skb2->dev = dev;
+ skb->dev = dev;
- dev->hard_header(skb2, dev, ETH_P_PPP_SES,
+ dev->hard_header(skb, dev, ETH_P_PPP_SES,
po->pppoe_pa.remote, NULL, data_len);
- /* We're transmitting skb2, and assuming that dev_queue_xmit
- * will free it. The generic ppp layer however, is expecting
- * that we give back 'skb' (not 'skb2') in case of failure,
- * but free it in case of success.
- */
-
- if (dev_queue_xmit(skb2) < 0)
+ if (dev_queue_xmit(skb) < 0)
goto abort;
- kfree_skb(skb);
return 1;
abort:
- return 0;
+ kfree_skb(skb);
+ return 1;
}