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powerpc: use for_each_sg()

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This replaces the plain loop over the sglist array with for_each_sg()
macro which consists of sg_next() function calls.  Since powerpc does
select ARCH_HAS_SG_CHAIN, it is necessary to use for_each_sg() in order
to loop over each sg element.  This also help find problems with drivers
that do not properly initialize their sg tables when CONFIG_DEBUG_SG is
enabled.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2015-06-24 16:54:43 -07:00 committed by Linus Torvalds
parent ae70a7bbc5
commit 5935877af4
1 changed files with 5 additions and 5 deletions
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10
arch/powerpc/kernel/vio.c
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@ -557,11 +557,11 @@ static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
struct vio_dev *viodev = to_vio_dev(dev);
struct iommu_table *tbl;
struct scatterlist *sgl;
int ret, count = 0;
int ret, count;
size_t alloc_size = 0;
tbl = get_iommu_table_base(dev);
for (sgl = sglist; count < nelems; count++, sgl++)
for_each_sg(sglist, sgl, nelems, count)
alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
if (vio_cmo_alloc(viodev, alloc_size)) {
@ -577,7 +577,7 @@ static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
return ret;
}
for (sgl = sglist, count = 0; count < ret; count++, sgl++)
for_each_sg(sglist, sgl, ret, count)
alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
if (alloc_size)
vio_cmo_dealloc(viodev, alloc_size);
@ -594,10 +594,10 @@ static void vio_dma_iommu_unmap_sg(struct device *dev,
struct iommu_table *tbl;
struct scatterlist *sgl;
size_t alloc_size = 0;
int count = 0;
int count;
tbl = get_iommu_table_base(dev);
for (sgl = sglist; count < nelems; count++, sgl++)
for_each_sg(sglist, sgl, nelems, count)
alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);