xen-netfront: use correct linear area after linearizing an skb

[cascardo/linux.git] / drivers / net / xen-netfront.c

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index cca8713..eeed0ce 100644 (file)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -496,9 +496,6 @@ static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue *queue,
                len = skb_frag_size(frag);
                offset = frag->page_offset;
 
-               /* Data must not cross a page boundary. */
-               BUG_ON(len + offset > PAGE_SIZE<<compound_order(page));
-
                /* Skip unused frames from start of page */
                page += offset >> PAGE_SHIFT;
                offset &= ~PAGE_MASK;
@@ -506,8 +503,6 @@ static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue *queue,
                while (len > 0) {
                        unsigned long bytes;
 
-                       BUG_ON(offset >= PAGE_SIZE);
-
                        bytes = PAGE_SIZE - offset;
                        if (bytes > len)
                                bytes = len;
@@ -632,6 +627,9 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
                                    slots, skb->len);
                if (skb_linearize(skb))
                        goto drop;
+               data = skb->data;
+               offset = offset_in_page(data);
+               len = skb_headlen(skb);
        }
 
        spin_lock_irqsave(&queue->tx_lock, flags);