IA64: fix VT-d dma_mapping_error

dma_mapping_error is used to see if dma_map_single and dma_map_page
succeed. IA64 VT-d dma_mapping_error always says that dma_map_single
is successful even though it could fail. Note that X86 VT-d works
properly in this regard.

This patch fixes IA64 VT-d dma_mapping_error by adding VT-d's own
dma_mapping_error() that works for both X86_64 and IA64. VT-d uses
zero as an error dma address so VT-d's dma_mapping_error returns 1 if
a passed dma address is zero (as x86's VT-d dma_mapping_error does
now).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index c933980bf562..59de56304aa6 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -2581,6 +2581,11 @@ int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
         return nelems;
 }
 
+static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+        return !dma_addr;
+}
+
 struct dma_map_ops intel_dma_ops = {
         .alloc_coherent = intel_alloc_coherent,
         .free_coherent = intel_free_coherent,
@@ -2588,6 +2593,7 @@ struct dma_map_ops intel_dma_ops = {
         .unmap_sg = intel_unmap_sg,
         .map_page = intel_map_page,
         .unmap_page = intel_unmap_page,
+        .mapping_error = intel_mapping_error,
 };
 
 static inline int iommu_domain_cache_init(void)