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iommu/amd: Remove map_sg_no_iommu() 

This function was intended as a fall-back if the map_sg
function is called for a device not mapped by the IOMMU.
Since the AMD IOMMU driver uses per-device dma_ops this can
never happen. So this function isn't needed anymore.

Reviewed-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Joerg Roedel 2013-04-09 15:04:36 +02:00
parent 925fe08bce
commit a0e191b23d
1 changed files with 1 additions and 21 deletions
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22
drivers/iommu/amd_iommu.c
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@ -2841,24 +2841,6 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
spin_unlock_irqrestore(&domain->lock, flags); spin_unlock_irqrestore(&domain->lock, flags);
} }
/*
* This is a special map_sg function which is used if we should map a
* device which is not handled by an AMD IOMMU in the system.
*/
static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
int nelems, int dir)
{
struct scatterlist *s;
int i;
for_each_sg(sglist, s, nelems, i) {
s->dma_address = (dma_addr_t)sg_phys(s);
s->dma_length = s->length;
}
return nelems;
}
/* /*
* The exported map_sg function for dma_ops (handles scatter-gather * The exported map_sg function for dma_ops (handles scatter-gather
* lists). * lists).
@ -2878,9 +2860,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
INC_STATS_COUNTER(cnt_map_sg); INC_STATS_COUNTER(cnt_map_sg);
domain = get_domain(dev); domain = get_domain(dev);
if (PTR_ERR(domain) == -EINVAL) if (IS_ERR(domain))
return map_sg_no_iommu(dev, sglist, nelems, dir);
else if (IS_ERR(domain))
return 0; return 0;
dma_mask = *dev->dma_mask; dma_mask = *dev->dma_mask;