[PATCH RESEND] atl1: fix 4G memory corruption bug

From: Alexey Dobriyan
Date: Thu May 22 2008 - 17:04:46 EST

From: Alexey Dobriyan <adobriyan@xxxxxxxxx>

When using 4+ GB RAM and SWIOTLB is active, the driver corrupts
memory by writing an skb after the relevant DMA page has been
unmapped. Although this doesn't happen when *not* using bounce
buffers, clearing the pointer to the DMA page after unmapping
it fixes the problem.


Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Jay Cliburn <jacliburn@xxxxxxxxxxxxx>

drivers/net/atlx/atl1.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

--- a/drivers/net/atlx/atl1.c
+++ b/drivers/net/atlx/atl1.c
@@ -2027,6 +2027,7 @@ rrd_ok:
/* Good Receive */
pci_unmap_page(adapter->pdev, buffer_info->dma,
buffer_info->length, PCI_DMA_FROMDEVICE);
+ buffer_info->dma = 0;
skb = buffer_info->skb;
length = le16_to_cpu(rrd->xsz.xsum_sz.pkt_size);

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