icmp_push_reply(): reorder adding the checksum up

do csum_partial_copy_nocheck() on the first fragment, then
add the rest to it.  Equivalent transformation.

That was the only caller of csum_partial_copy_nocheck() that
might pass it non-zero as the last argument.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index d15f780..e23dd5f 100644 (file)
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -376,15 +376,15 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
                ip_flush_pending_frames(sk);
        } else if ((skb = skb_peek(&sk->sk_write_queue)) != NULL) {
                struct icmphdr *icmph = icmp_hdr(skb);
-               __wsum csum = 0;
+               __wsum csum;
                struct sk_buff *skb1;
 
+               csum = csum_partial_copy_nocheck((void *)&icmp_param->data,
+                                                (char *)icmph,
+                                                icmp_param->head_len, 0);
                skb_queue_walk(&sk->sk_write_queue, skb1) {
                        csum = csum_add(csum, skb1->csum);
                }
-               csum = csum_partial_copy_nocheck((void *)&icmp_param->data,
-                                                (char *)icmph,
-                                                icmp_param->head_len, csum);
                icmph->checksum = csum_fold(csum);
                skb->ip_summed = CHECKSUM_NONE;
                ip_push_pending_frames(sk, fl4);