From: Brian King <brking@linux.vnet.ibm.com>
Date: Wed, 7 Sep 2011 14:41:03 +0000 (+0000)
Subject: ibmveth: Fix DMA unmap error
X-Git-Tag: v3.0.5~114
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=63bac6629520236226e54128c873871f1ff1f018;p=karo-tx-linux.git

ibmveth: Fix DMA unmap error

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@linux.vnet.ibm.com>
Acked-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 f9d49cc75175..dc9bac0e92fa 100644
--- 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);