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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2016-12-14 15:04:35 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-14 16:04:07 -0800 |
| commit | e8b4762c22589a514add9bf9dda7a3050e4fa54c (patch) | |
| tree | eaef3dc38b62ffe2aaf3e13db0a86f4b9098b828 /arch/avr32/mm | |
| parent | fc1b138de7917d8fda5995aeecdb10c8182d9f75 (diff) | |
| download | linux-stable-e8b4762c22589a514add9bf9dda7a3050e4fa54c.tar.gz linux-stable-e8b4762c22589a514add9bf9dda7a3050e4fa54c.tar.bz2 linux-stable-e8b4762c22589a514add9bf9dda7a3050e4fa54c.zip | |
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: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/avr32/mm')
| -rw-r--r-- | arch/avr32/mm/dma-coherent.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c index 58610d0df7ed..54534e5d0781 100644 --- a/arch/avr32/mm/dma-coherent.c +++ b/arch/avr32/mm/dma-coherent.c @@ -146,7 +146,8 @@ static dma_addr_t avr32_dma_map_page(struct device *dev, struct page *page, { void *cpu_addr = page_address(page) + offset; - dma_cache_sync(dev, cpu_addr, size, direction); + 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); } |