ibmveth: Fix issue with DMA mapping failure

commit b93da27f5234198433345e40b39ff59797bc6f6e upstream.

descs[].fields.address is 32bit which truncates any dma mapping
errors so dma_mapping_error() fails to catch it.

Use a dma_addr_t to do the comparison. With this patch I was able
to transfer many gigabytes of data with IOMMU fault injection set
at 10% probability.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index dc9bac0..448d74d 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -929,6 +929,7 @@
 	union ibmveth_buf_desc descs[6];
 	int last, i;
 	int force_bounce = 0;
+	dma_addr_t dma_addr;
 
 	/*
 	 * veth handles a maximum of 6 segments including the header, so
@@ -993,17 +994,16 @@
 	}
 
 	/* Map the header */
-	descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
-						 skb_headlen(skb),
-						 DMA_TO_DEVICE);
-	if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
+	dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
+				  skb_headlen(skb), DMA_TO_DEVICE);
+	if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
 		goto map_failed;
 
 	descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
+	descs[0].fields.address = dma_addr;
 
 	/* Map the frags */
 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
-		unsigned long dma_addr;
 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 
 		dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,