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Commit 6c503d0d authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

sparc/iommu: fix ->map_sg return value 



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: ce65d36f ("sparc: remove the sparc32_dma_ops indirection")
Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 1e2934ad

arch/sparc/mm/iommu.c

+18 −21
Original line number Diff line number Diff line
@@ -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);

	}

}