[NET]: Replace skb_pull/skb_postpull_rcsum with skb_pull_rcsum
We're now starting to have quite a number of places that do skb_pull
followed immediately by an skb_postpull_rcsum. We can merge these two
operations into one function with skb_pull_rcsum. This makes sense
since most pull operations on receive skb's need to update the
checksum.
I've decided to make this out-of-line since it is fairly big and the
fast path where hardware checksums are enabled need to call
csum_partial anyway.
Since this is a brand new function we get to add an extra check on the
len argument. As it is most callers of skb_pull ignore its return
value which essentially means that there is no check on the len
argument.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index 0245e40..f608c12 100644
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -1691,8 +1691,8 @@
|| ppp->npmode[npi] != NPMODE_PASS) {
kfree_skb(skb);
} else {
- skb_pull(skb, 2); /* chop off protocol */
- skb_postpull_rcsum(skb, skb->data - 2, 2);
+ /* chop off protocol */
+ skb_pull_rcsum(skb, 2);
skb->dev = ppp->dev;
skb->protocol = htons(npindex_to_ethertype[npi]);
skb->mac.raw = skb->data;
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 9369f81..475dc93 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -337,8 +337,7 @@
if (sk->sk_state & PPPOX_BOUND) {
struct pppoe_hdr *ph = (struct pppoe_hdr *) skb->nh.raw;
int len = ntohs(ph->length);
- skb_pull(skb, sizeof(struct pppoe_hdr));
- skb_postpull_rcsum(skb, ph, sizeof(*ph));
+ skb_pull_rcsum(skb, sizeof(struct pppoe_hdr));
if (pskb_trim_rcsum(skb, len))
goto abort_kfree;
