From mboxrd@z Thu Jan 1 00:00:00 1970 From: hch@lst.de (Christoph Hellwig) Date: Tue, 22 May 2018 14:04:14 +0200 Subject: [PATCH 09/25] nds32: implement the unmap_sg DMA operation In-Reply-To: <20180522120430.28709-1-hch@lst.de> References: <20180522120430.28709-1-hch@lst.de> Message-ID: <20180522120430.28709-10-hch@lst.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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 4e6fb4ffd3f7..43d7fd432bb6 100644 --- a/arch/nds32/kernel/dma.c +++ b/arch/nds32/kernel/dma.c @@ -426,6 +426,12 @@ 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 = { -- 2.17.0