[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, 2 insertions, 4 deletions

diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index e060aad8624d..6787bc5197f7 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -425,8 +425,7 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
 
                 if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
                         u8 *vhdr = skb->data;
-                        skb_pull(skb, VLAN_HLEN);
-                        skb_postpull_rcsum(skb, vhdr, VLAN_HLEN);
+                        skb_pull_rcsum(skb, VLAN_HLEN);
                         skb->nh.raw += VLAN_HLEN;
                 }
                 return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn);
@@ -444,8 +443,7 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
 
         if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
                 u8 *vhdr = skb->data;
-                skb_pull(skb, VLAN_HLEN);
-                skb_postpull_rcsum(skb, vhdr, VLAN_HLEN);
+                skb_pull_rcsum(skb, VLAN_HLEN);
                 skb->nh.raw += VLAN_HLEN;
         }