[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.s...@samsung.com>

---
 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