x86: pci-gart fix

map_sg could copy the last sg element to another position (if merging
some elements). It breaks sg chaining. This copies only
dma_address/length instead of the whole sg element.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index c56e9ee64964..ae7e0161ce46 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -338,7 +338,6 @@ static int __dma_map_cont(struct scatterlist *start, int nelems,
                 
                 BUG_ON(s != start && s->offset);
                 if (s == start) {
-                        *sout = *s; 
                         sout->dma_address = iommu_bus_base;
                         sout->dma_address += iommu_page*PAGE_SIZE + s->offset;
                         sout->dma_length = s->length;
@@ -365,7 +364,7 @@ static inline int dma_map_cont(struct scatterlist *start, int nelems,
 {
         if (!need) {
                 BUG_ON(nelems != 1);
-                *sout = *start;
+                sout->dma_address = start->dma_address;
                 sout->dma_length = start->length;
                 return 0;
         }