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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2015-06-25 02:55:37 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-25 03:49:40 +0300 |
| commit | 210bff6d231217c3c63e0115af7eb01603b83015 (patch) | |
| tree | e012ff274418d037b0199424ec526e4934a883d7 | |
| parent | b519ea6d9a2f9c5d3cb90860f225564daa983bff (diff) | |
| download | linux-210bff6d231217c3c63e0115af7eb01603b83015.tar.xz | |
parisc: use for_each_sg()
This replaces the plain loop over the sglist array with for_each_sg()
macro which consists of sg_next() function calls. Since parisc doesn't
select ARCH_HAS_SG_CHAIN, it is not necessary to use for_each_sg() in
order to loop over each sg element. But this can 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: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/parisc/kernel/pci-dma.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c index ff834fd67478..b9402c9b3454 100644 --- a/arch/parisc/kernel/pci-dma.c +++ b/arch/parisc/kernel/pci-dma.c @@ -478,14 +478,16 @@ static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, siz static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) { int i; + struct scatterlist *sg; BUG_ON(direction == DMA_NONE); - for (i = 0; i < nents; i++, sglist++ ) { - unsigned long vaddr = (unsigned long)sg_virt(sglist); - sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr); - sg_dma_len(sglist) = sglist->length; - flush_kernel_dcache_range(vaddr, sglist->length); + for_each_sg(sglist, sg, nents, i) { + unsigned long vaddr = (unsigned long)sg_virt(sg); + + sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr); + sg_dma_len(sg) = sg->length; + flush_kernel_dcache_range(vaddr, sg->length); } return nents; } @@ -493,6 +495,7 @@ static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int n static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) { int i; + struct scatterlist *sg; BUG_ON(direction == DMA_NONE); @@ -501,8 +504,8 @@ static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, in /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_vmap_range(sg_virt(sglist), sglist->length); + for_each_sg(sglist, sg, nents, i) + flush_kernel_vmap_range(sg_virt(sg), sg->length); return; } @@ -523,21 +526,23 @@ static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_h static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) { int i; + struct scatterlist *sg; /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_vmap_range(sg_virt(sglist), sglist->length); + for_each_sg(sglist, sg, nents, i) + flush_kernel_vmap_range(sg_virt(sg), sg->length); } static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) { int i; + struct scatterlist *sg; /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - for (i = 0; i < nents; i++, sglist++ ) - flush_kernel_vmap_range(sg_virt(sglist), sglist->length); + for_each_sg(sglist, sg, nents, i) + flush_kernel_vmap_range(sg_virt(sg), sg->length); } struct hppa_dma_ops pcxl_dma_ops = { |