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SubjectRe: [PATCH net-next v3 6/9] xen-netback: Handle guests with too many frags
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On Wed, 2014-01-08 at 00:10 +0000, Zoltan Kiss wrote:

>
> + if (skb_shinfo(skb)->frag_list) {
> + nskb = skb_shinfo(skb)->frag_list;
> + xenvif_fill_frags(vif, nskb, INVALID_PENDING_IDX);
> + skb->len += nskb->len;
> + skb->data_len += nskb->len;
> + skb->truesize += nskb->truesize;
> + skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
> + skb_shinfo(nskb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
> + vif->tx_zerocopy_sent += 2;
> + nskb = skb;
> +
> + skb = skb_copy_expand(skb,
> + 0,
> + 0,
> + GFP_ATOMIC | __GFP_NOWARN);

skb can be NULL here

> + skb_shinfo(skb)->destructor_arg = NULL;
> + }
> if (skb_is_nonlinear(skb) && skb_headlen(skb) < PKT_PROT_LEN) {
> int target = min_t(int, skb->len, PKT_PROT_LEN);
> __pskb_pull_tail(skb, target - skb_headlen(skb));
> @@ -1568,6 +1660,9 @@ static int xenvif_tx_submit(struct xenvif *vif)
> }
>




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