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sparc/iommu: fix ->map_sg return value

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Just decrementing the sz value will lead to an incorrect return value.
Instead of just introducing a local variable switch to the standard
for_each_sg helper and standard naming of the arguments.

Fixes: ce65d36f3e ("sparc: remove the sparc32_dma_ops indirection")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Christoph Hellwig 2018-12-16 10:23:28 +01:00
parent 1e2934ad7f
commit 6c503d0d88
1 changed files with 18 additions and 21 deletions
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39
arch/sparc/mm/iommu.c
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@ -241,32 +241,31 @@ static dma_addr_t sbus_iommu_map_page_pflush(struct device *dev,
return __sbus_iommu_map_page(dev, page, offset, len);
}
static int sbus_iommu_map_sg_gflush(struct device *dev, struct scatterlist *sg,
int sz, enum dma_data_direction dir, unsigned long attrs)
static int sbus_iommu_map_sg_gflush(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
int n;
struct scatterlist *sg;
int i, n;
flush_page_for_dma(0);
while (sz != 0) {
--sz;
for_each_sg(sgl, sg, nents, i) {
n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
sg->dma_address = iommu_get_one(dev, sg_page(sg), n) + sg->offset;
sg->dma_length = sg->length;
sg = sg_next(sg);
}
return sz;
return nents;
}
static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sg,
int sz, enum dma_data_direction dir, unsigned long attrs)
static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
unsigned long page, oldpage = 0;
int n, i;
while(sz != 0) {
--sz;
struct scatterlist *sg;
int i, j, n;
for_each_sg(sgl, sg, nents, j) {
n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
/*
@ -286,10 +285,9 @@ static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sg,
sg->dma_address = iommu_get_one(dev, sg_page(sg), n) + sg->offset;
sg->dma_length = sg->length;
sg = sg_next(sg);
}
return sz;
return nents;
}
static void iommu_release_one(struct device *dev, u32 busa, int npages)
@ -318,17 +316,16 @@ static void sbus_iommu_unmap_page(struct device *dev, dma_addr_t dma_addr,
iommu_release_one(dev, dma_addr & PAGE_MASK, npages);
}
static void sbus_iommu_unmap_sg(struct device *dev, struct scatterlist *sg,
int sz, enum dma_data_direction dir, unsigned long attrs)
static void sbus_iommu_unmap_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
int n;
struct scatterlist *sg;
int i, n;
while(sz != 0) {
--sz;
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);
sg->dma_address = 0x21212121;
sg = sg_next(sg);
}
}