[PATCH 09/25] nds32: implement the unmap_sg DMA operation
From: Christoph Hellwig <hch@lst.de>
Date: 2018-05-22 12:05:25
Also in:
linux-arch, linux-arm-kernel, linux-iommu, linux-sh, lkml, sparclinux
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <hch@lst.de> --- 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