From f860122c512215df598fc5b5cfe36e35335f6c6f Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sat, 19 May 2018 09:22:05 +0200 Subject: [PATCH] nds32: implement the unmap_sg DMA operation This matches the implementation of the more commonly used unmap_single routines and the sync_sg_for_cpu method which should provide equivalent cache maintainance. Signed-off-by: Christoph Hellwig Acked-by: Greentime Hu Tested-by: Greentime Hu --- arch/nds32/kernel/dma.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/nds32/kernel/dma.c b/arch/nds32/kernel/dma.c index e0c94a2889c5..b9973317c734 100644 --- a/arch/nds32/kernel/dma.c +++ b/arch/nds32/kernel/dma.c @@ -458,6 +458,12 @@ static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction dir, unsigned long attrs) { + int i; + + for (i = 0; i < nhwentries; i++, sg++) { + nds32_dma_sync_single_for_cpu(dev, sg_dma_address(sg), + sg->length, dir); + } } struct dma_map_ops nds32_dma_ops = { -- 2.45.2