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sparc/iommu: use sbus_iommu_unmap_page in sbus_iommu_unmap_sg 

Use the page-level helper instead of duplicating the logic, while also
fixing the incorrect handling of larger than page sized offsets in
the sg variant.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2019-04-16 20:23:40 +02:00 committed by David S. Miller
parent 031abf0b70
commit a7fce1f7ca
1 changed files with 3 additions and 3 deletions
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6
arch/sparc/mm/iommu.c
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@ -321,11 +321,11 @@ static void sbus_iommu_unmap_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
struct scatterlist *sg;
int i, n;
int i;
for_each_sg(sgl, sg, nents, i) {
n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
iommu_release_one(dev, sg->dma_address & PAGE_MASK, n);
sbus_iommu_unmap_page(dev, sg->dma_address, sg->length, dir,
attrs);
sg->dma_address = 0x21212121;
}
}