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Commit e8b4762c authored by Alexander Duyck's avatar Alexander Duyck Committed by Linus Torvalds
Browse files

arch/avr32: 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/20161110113430.76501.79737.stgit@ahduyck-blue-test.jf.intel.com


Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Acked-by: default avatarHans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fc1b138d

arch/avr32/mm/dma-coherent.c

+6 −1
Original line number Diff line number Diff line
@@ -146,6 +146,7 @@ static dma_addr_t avr32_dma_map_page(struct device *dev, struct page *page, 
{

	void *cpu_addr = page_address(page) + offset;



	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		dma_cache_sync(dev, cpu_addr, size, direction);

	return virt_to_bus(cpu_addr);

}
@@ -162,6 +163,10 @@ static int avr32_dma_map_sg(struct device *dev, struct scatterlist *sglist, 


		sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;

		virt = sg_virt(sg);



		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)

			continue;



		dma_cache_sync(dev, virt, sg->length, direction);

	}