Merge branch 'parisc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...

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

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 96ccd4e..e17879d 100644 (file)
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -565,6 +565,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
        struct netfront_queue *queue = NULL;
        unsigned int num_queues = dev->real_num_tx_queues;
        u16 queue_index;
+       struct sk_buff *nskb;
 
        /* Drop the packet if no queues are set up */
        if (num_queues < 1)
@@ -593,6 +594,20 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
        page = virt_to_page(skb->data);
        offset = offset_in_page(skb->data);
+
+       /* The first req should be at least ETH_HLEN size or the packet will be
+        * dropped by netback.
+        */
+       if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) {
+               nskb = skb_copy(skb, GFP_ATOMIC);
+               if (!nskb)
+                       goto drop;
+               dev_kfree_skb_any(skb);
+               skb = nskb;
+               page = virt_to_page(skb->data);
+               offset = offset_in_page(skb->data);
+       }
+
        len = skb_headlen(skb);
 
        spin_lock_irqsave(&queue->tx_lock, flags);