iommu/amd: Remove map_sg_no_iommu()

This function was intended as a fall-back if the map_sg
function is called for a device not mapped by the IOMMU.
Since the AMD IOMMU driver uses per-device dma_ops this can
never happen. So this function isn't needed anymore.

Reviewed-by: Shuah Khan <shuahkhan@gmail.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index d6433e2..93b1874 100644 (file)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2842,24 +2842,6 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
 }
 
 /*
- * This is a special map_sg function which is used if we should map a
- * device which is not handled by an AMD IOMMU in the system.
- */
-static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
-                          int nelems, int dir)
-{
-       struct scatterlist *s;
-       int i;
-
-       for_each_sg(sglist, s, nelems, i) {
-               s->dma_address = (dma_addr_t)sg_phys(s);
-               s->dma_length  = s->length;
-       }
-
-       return nelems;
-}
-
-/*
  * The exported map_sg function for dma_ops (handles scatter-gather
  * lists).
  */
@@ -2878,9 +2860,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
        INC_STATS_COUNTER(cnt_map_sg);
 
        domain = get_domain(dev);
-       if (PTR_ERR(domain) == -EINVAL)
-               return map_sg_no_iommu(dev, sglist, nelems, dir);
-       else if (IS_ERR(domain))
+       if (IS_ERR(domain))
                return 0;
 
        dma_mask = *dev->dma_mask;