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| author | Andi Kleen <ak@suse.de> | 2006-02-12 14:34:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-12 16:10:47 -0800 |
| commit | 0d541064e8f58858e11cd34d81b6e83617f6eb4a (patch) | |
| tree | 2118bef73c46aa505eb54cdbbfe80e0c7ab93738 | |
| parent | a65d17c9d27a85782cfe1bbc36c747ffa1f81814 (diff) | |
| download | lwn-0d541064e8f58858e11cd34d81b6e83617f6eb4a.tar.gz lwn-0d541064e8f58858e11cd34d81b6e83617f6eb4a.zip | |
[PATCH] x86_64: GART DMA merging fix
Don't touch the non DMA members in the sg list in dma_map_sg in the IOMMU
Some drivers (in particular ST) 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.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/pci-gart.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c index 2fe23a6c361b..dd0718dc178b 100644 --- a/arch/x86_64/kernel/pci-gart.c +++ b/arch/x86_64/kernel/pci-gart.c @@ -310,7 +310,7 @@ void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, int di for (i = 0; i < nents; i++) { struct scatterlist *s = &sg[i]; - if (!s->dma_length || !s->length) + if (!s->dma_length) break; dma_unmap_single(dev, s->dma_address, s->dma_length, dir); } @@ -364,7 +364,6 @@ static int __dma_map_cont(struct scatterlist *sg, int start, int stopat, BUG_ON(i > start && s->offset); if (i == start) { - *sout = *s; sout->dma_address = iommu_bus_base; sout->dma_address += iommu_page*PAGE_SIZE + s->offset; sout->dma_length = s->length; @@ -379,7 +378,7 @@ static int __dma_map_cont(struct scatterlist *sg, int start, int stopat, SET_LEAK(iommu_page); addr += PAGE_SIZE; iommu_page++; - } + } } BUG_ON(iommu_page - iommu_start != pages); return 0; @@ -391,7 +390,6 @@ static inline int dma_map_cont(struct scatterlist *sg, int start, int stopat, { if (!need) { BUG_ON(stopat - start != 1); - *sout = sg[start]; sout->dma_length = sg[start].length; return 0; } |