[PATCH] swiotlb: Replace dma_length to sg_dma_len() macro

[EUNBONG SONG]

This patch replace dma_length in "lib/swiotlb.c" to sg_dma_len() macro, because the build error can occur
if CONFIG_NEED_SG_DMA_LENGTH is not set, and CONFIG_SWIOTLB is set.
I confirmed compile only. 

Singed-off-by: EunBong Song <eunb.song@xxxxxxxxxxx>

---
 lib/swiotlb.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index bfe02b8..7b16f4a 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -859,13 +859,13 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
 				swiotlb_full(hwdev, sg->length, dir, 0);
 				swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
 						       attrs);
-				sgl[0].dma_length = 0;
+				sg_dma_len(sgl) = 0;
 				return 0;
 			}
 			sg->dma_address = phys_to_dma(hwdev, map);
 		} else
 			sg->dma_address = dev_addr;
-		sg->dma_length = sg->length;
+		sg_dma_len(sg) = sg->length;
 	}
 	return nelems;
 }
@@ -893,7 +893,7 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 	BUG_ON(dir == DMA_NONE);
 
 	for_each_sg(sgl, sg, nelems, i)
-		unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
+		unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir);
 
 }
 EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
@@ -923,7 +923,7 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
 
 	for_each_sg(sgl, sg, nelems, i)
 		swiotlb_sync_single(hwdev, sg->dma_address,
-				    sg->dma_length, dir, target);
+				    sg_dma_len(sg), dir, target);
 }
 
 void
-- 
1.7.0.4
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