dma-debug: use sg_dma_len accessor

debug_dma_map_sg() and debug_dma_unmap_sg() use length in struct
scatterlist while debug_dma_sync_sg_for_cpu() and
debug_dma_sync_sg_for_device() use dma_length. This causes bugs
warnings on some IOMMU implementations since these values are not
same; the length doesn't represent the dma length.

We always need to use sg_dma_len() accessor to get the dma length of a
scatterlist entry.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 1b5bb82..51f95e5 100644 (file)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -839,7 +839,7 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
                entry->type           = dma_debug_sg;
                entry->dev            = dev;
                entry->paddr          = sg_phys(s);
-               entry->size           = s->length;
+               entry->size           = sg_dma_len(s);
                entry->dev_addr       = sg_dma_address(s);
                entry->direction      = direction;
                entry->sg_call_ents   = nents;
@@ -847,7 +847,7 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
 
                if (!PageHighMem(sg_page(s))) {
                        check_for_stack(dev, sg_virt(s));
-                       check_for_illegal_area(dev, sg_virt(s), s->length);
+                       check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
                }
 
                add_dma_entry(entry);
@@ -873,7 +873,7 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
                        .dev            = dev,
                        .paddr          = sg_phys(s),
                        .dev_addr       = sg_dma_address(s),
-                       .size           = s->length,
+                       .size           = sg_dma_len(s),
                        .direction      = dir,
                        .sg_call_ents   = 0,
                };
@@ -996,7 +996,7 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
                return;
 
        for_each_sg(sg, s, nelems, i) {
-               check_sync(dev, sg_dma_address(s), s->dma_length, 0,
+               check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
                           direction, true);
        }
 }
@@ -1012,7 +1012,7 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
                return;
 
        for_each_sg(sg, s, nelems, i) {
-               check_sync(dev, sg_dma_address(s), s->dma_length, 0,
+               check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
                           direction, false);
        }
 }