From 83bc0ed804595195df6bc8c5773db5594884e2e7 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Wed, 7 Sep 2011 14:41:04 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ibmveth.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c index dc9bac0e92fa..448d74ddf85f 100644 --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -929,6 +929,7 @@ static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb, 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 @@ retry_bounce: } /* 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, -- 2.39.5