[PATCH v3 02/21] dma-direct: Return appropriate error code from dma_direct_map_sg()

[Logan Gunthorpe <logang@xxxxxxxxxxxx>]

Now that the map_sg() op expects error codes instead of return zero on
error, convert dma_direct_map_sg() to return an error code. Per the
documentation for dma_map_sgtable(), -EIO is returned due to an
DMA_MAPPING_ERROR with unknown cause.

Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
---
 kernel/dma/direct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index f737e3347059..f33ceb68aef2 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -411,7 +411,7 @@ int dma_direct_map_sg(struct device *dev, struct 
scatterlist *sgl, int nents,
 
 out_unmap:
        dma_direct_unmap_sg(dev, sgl, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);
-       return 0;
+       return -EIO;
 }
 
 dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
-- 
2.20.1