Messages in this thread |  | | | Date | Mon, 5 Jan 2004 11:28:00 -0800 | | From | "David S. Miller" <> | | Subject | Re: [BUG] x86_64 pci_map_sg modifies sg list - fails multiple map/unmaps |
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On Mon, 5 Jan 2004 13:29:54 -0600 (CST) Berkley Shands <berkley@cs.wustl.edu> wrote:
> The pci layer is modifying the sg list, and then placing a zero > in the length field. pci-gart.c at line 453 (2.6.0 sources) checks this length field > after a retry, sees that it is zero, and bughalts.
Oh that's a bug. It is allowed to modify the dma_length field but not the physical length field.
I imagine x86_64 is doing this so that there need not be a seperate dma_length field in the scatter_gather struct defined for that platform, and that's too bad it will definitely need such a seperate field if it wants to implement coalescing. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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