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SubjectRe: [PATCH] ipr: don't doublefree pages from scatterlist
From: Andi Kleen <>
Date: Mon, 6 Feb 2006 22:11:29 +0100

> Don't touch the non DMA members in the sg list in dma_map_sg in the IOMMU
> Some drivers (in particular ipr) ran into problems because they
> reused the sg lists after passing them to pci_map_sg(). The merging
> procedure in the K8 GART IOMMU corrupted the state. This patch
> changes it to only touch the dma* entries during merging,
> but not the other fields. Approach suggested by Dave Miller.
> I did some basic tests with CONFIG_IOMMU_DEBUG (LTP, large dd)
> and without and it hold up, but needs more testing.
> Signed-off-by: Andi Kleen <>

Thanks for doing this work Andi.
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