[130/244] ibmveth: Fix DMA unmap error

[Greg KH]

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Brian King <brking@xxxxxxxxxxxxxxxxxx>

commit 33a48ab105a75d37021e422a0a3283241099b142 upstream.

Commit 6e8ab30ec677 (ibmveth: Add scatter-gather support) introduced a
DMA mapping API inconsistency resulting in dma_unmap_page getting
called on memory mapped via dma_map_single. This was seen when
CONFIG_DMA_API_DEBUG was enabled. Fix up this API usage inconsistency.

Signed-off-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
Acked-by: Anton Blanchard <anton@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/net/ibmveth.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -1025,7 +1025,12 @@ retry_bounce:
 		netdev->stats.tx_bytes += skb->len;
 	}
 
-	for (i = 0; i < skb_shinfo(skb)->nr_frags + 1; i++)
+	dma_unmap_single(&adapter->vdev->dev,
+			 descs[0].fields.address,
+			 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
+			 DMA_TO_DEVICE);
+
+	for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
 		dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
 			       descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
 			       DMA_TO_DEVICE);


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