netfilter: defrag: remove one redundant atomic ops
Instead of doing one atomic operation per frag, we can factorize them. Reported from Eric Dumazet. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
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@ -442,7 +442,6 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
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skb_shinfo(head)->frag_list = head->next;
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skb_reset_transport_header(head);
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skb_push(head, head->data - skb_network_header(head));
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atomic_sub(head->truesize, &nf_init_frags.mem);
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for (fp=head->next; fp; fp = fp->next) {
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head->data_len += fp->len;
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@ -452,8 +451,8 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
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else if (head->ip_summed == CHECKSUM_COMPLETE)
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head->csum = csum_add(head->csum, fp->csum);
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head->truesize += fp->truesize;
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atomic_sub(fp->truesize, &nf_init_frags.mem);
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}
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atomic_sub(head->truesize, &nf_init_frags.mem);
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head->next = NULL;
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head->dev = dev;
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