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arch/blackfin: add option to skip sync on DMA map 

The use of DMA_ATTR_SKIP_CPU_SYNC was not consistent across all of the
DMA APIs in the arch/arm folder.  This change is meant to correct that
so that we get consistent behavior.

Link: http://lkml.kernel.org/r/20161110113436.76501.13386.stgit@ahduyck-blue-test.jf.intel.com
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Cc: Steven Miao <realmz6@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Duyck 2016-12-14 15:04:38 -08:00 committed by Linus Torvalds
parent e8b4762c22
commit 8c16a2e209
1 changed files with 7 additions and 1 deletions
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8
arch/blackfin/kernel/dma-mapping.c
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@ -118,6 +118,10 @@ static int bfin_dma_map_sg(struct device *dev, struct scatterlist *sg_list,
for_each_sg(sg_list, sg, nents, i) {
sg->dma_address = (dma_addr_t) sg_virt(sg);
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
continue;
__dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
}
@ -143,7 +147,9 @@ static dma_addr_t bfin_dma_map_page(struct device *dev, struct page *page,
{
dma_addr_t handle = (dma_addr_t)(page_address(page) + offset);
_dma_sync(handle, size, dir);
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
_dma_sync(handle, size, dir);
return handle;
}