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path: root/drivers/net/xen-netback/netback.c
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Diffstat (limited to 'drivers/net/xen-netback/netback.c')
-rw-r--r--drivers/net/xen-netback/netback.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index c4d68d768408..cab9f5257f57 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1349,7 +1349,7 @@ static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *s
{
unsigned int offset = skb_headlen(skb);
skb_frag_t frags[MAX_SKB_FRAGS];
- int i;
+ int i, f;
struct ubuf_info *uarg;
struct sk_buff *nskb = skb_shinfo(skb)->frag_list;
@@ -1389,23 +1389,25 @@ static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *s
frags[i].page_offset = 0;
skb_frag_size_set(&frags[i], len);
}
- /* swap out with old one */
- memcpy(skb_shinfo(skb)->frags,
- frags,
- i * sizeof(skb_frag_t));
- skb_shinfo(skb)->nr_frags = i;
- skb->truesize += i * PAGE_SIZE;
- /* remove traces of mapped pages and frag_list */
+ /* Copied all the bits from the frag list -- free it. */
skb_frag_list_init(skb);
+ xenvif_skb_zerocopy_prepare(queue, nskb);
+ kfree_skb(nskb);
+
+ /* Release all the original (foreign) frags. */
+ for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
+ skb_frag_unref(skb, f);
uarg = skb_shinfo(skb)->destructor_arg;
/* increase inflight counter to offset decrement in callback */
atomic_inc(&queue->inflight_packets);
uarg->callback(uarg, true);
skb_shinfo(skb)->destructor_arg = NULL;
- xenvif_skb_zerocopy_prepare(queue, nskb);
- kfree_skb(nskb);
+ /* Fill the skb with the new (local) frags. */
+ memcpy(skb_shinfo(skb)->frags, frags, i * sizeof(skb_frag_t));
+ skb_shinfo(skb)->nr_frags = i;
+ skb->truesize += i * PAGE_SIZE;
return 0;
}