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netfilter: defrag: remove one redundant atomic ops

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Instead of doing one atomic operation per frag, we can factorize them.
Reported from Eric Dumazet.

Signed-off-by: Shan Wei <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>
This commit is contained in:
Shan Wei 2010-06-14 16:28:23 +02:00 • committed by Patrick McHardy
commit 841a5940eb
1 changed files with 1 additions and 2 deletions
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3
net/ipv6/netfilter/nf_conntrack_reasm.c
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@ -442,7 +442,6 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
skb_shinfo(head)->frag_list = head->next;
skb_reset_transport_header(head);
skb_push(head, head->data - skb_network_header(head));
atomic_sub(head->truesize, &nf_init_frags.mem);
for (fp=head->next; fp; fp = fp->next) {
head->data_len += fp->len;
@ -452,8 +451,8 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
else if (head->ip_summed == CHECKSUM_COMPLETE)
head->csum = csum_add(head->csum, fp->csum);
head->truesize += fp->truesize;
atomic_sub(fp->truesize, &nf_init_frags.mem);
}
atomic_sub(head->truesize, &nf_init_frags.mem);
head->next = NULL;
head->dev = dev;