dma-mapping: return error code from dma_dummy_map_sg()

The .map_sg() op now expects an error code instead of zero on failure.

The only errno to return is -EINVAL in the case when DMA is not
supported.

Signed-off-by: Martin Oliveira <martin.oliveira@eideticom.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/kernel/dma/dummy.c b/kernel/dma/dummy.c
index eacd4c5b10bf6d84b9ea905b1d7beb0fd6605904..b492d59ac77ef0f4eda13cabc1b104c077c22754 100644 (file)
--- a/kernel/dma/dummy.c
+++ b/kernel/dma/dummy.c
@@ -22,7 +22,7 @@ static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
                int nelems, enum dma_data_direction dir,
                unsigned long attrs)
 {
-       return 0;
+       return -EINVAL;
 }
 
 static int dma_dummy_supported(struct device *hwdev, u64 mask)