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swiotlb: do not use sg_virt() 

Scatterlists containing HighMem pages do not have a useful virtual
address. Use the physical address instead.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ian Campbell 2009-01-09 18:32:10 +00:00 committed by Ingo Molnar
parent 0b8698ab58
commit 961d7d0ee5
1 changed files with 7 additions and 7 deletions
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14
lib/swiotlb.c
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@ -801,10 +801,10 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
BUG_ON(dir == DMA_NONE);
for_each_sg(sgl, sg, nelems, i) {
void *addr = sg_virt(sg);
dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, addr);
phys_addr_t paddr = sg_phys(sg);
dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr);
if (range_needs_mapping(sg_phys(sg), sg->length) ||
if (range_needs_mapping(paddr, sg->length) ||
address_needs_mapping(hwdev, dev_addr, sg->length)) {
void *map = map_single(hwdev, sg_phys(sg),
sg->length, dir);
@ -848,11 +848,11 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
BUG_ON(dir == DMA_NONE);
for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg)))
if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
unmap_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
sg->dma_length, dir);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(sg_virt(sg), sg->dma_length);
dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
}
}
EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
@ -882,11 +882,11 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
BUG_ON(dir == DMA_NONE);
for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg)))
if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
sg->dma_length, dir, target);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(sg_virt(sg), sg->dma_length);
dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
}
}