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Commit aefdbf1a authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by Jeff Garzik
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atl1: fix 4G memory corruption bug 

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.

http://marc.info/?t=120861317000005&r=2&w=2



Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: default avatarJay Cliburn <jacliburn@bellsouth.net>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 08722bc4

drivers/net/atlx/atl1.c

+1 −0
Original line number Diff line number Diff line
@@ -2023,6 +2023,7 @@ static void atl1_intr_rx(struct atl1_adapter *adapter) 
		/* 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);