[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>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/802/psnap.c b/net/802/psnap.c
index 34e42968b477..97c95eec79ed 100644
--- a/net/802/psnap.c
+++ b/net/802/psnap.c
@@ -61,8 +61,7 @@ static int snap_rcv(struct sk_buff *skb, struct net_device *dev,
                 /* Pass the frame on. */
                 u8 *hdr = skb->data;
                 skb->h.raw  += 5;
-                skb_pull(skb, 5);
-                skb_postpull_rcsum(skb, hdr, 5);
+                skb_pull_rcsum(skb, 5);
                 rc = proto->rcvfunc(skb, dev, &snap_packet_type, orig_dev);
         } else {
                 skb->sk = NULL;