[Xen-devel] [PATCH 22/44] x86/pci-nommu: implement ->mapping_error

[Christoph Hellwig <hch@xxxxxx>]

DMA_ERROR_CODE is going to go away, so don't rely on it.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 arch/x86/kernel/pci-nommu.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index a88952ef371c..085fe6ce4049 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -11,6 +11,8 @@
 #include <asm/iommu.h>
 #include <asm/dma.h>
 
+#define NOMMU_MAPPING_ERROR            0
+
 static int
 check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
 {
@@ -33,7 +35,7 @@ static dma_addr_t nommu_map_page(struct device *dev, struct 
page *page,
        dma_addr_t bus = page_to_phys(page) + offset;
        WARN_ON(size == 0);
        if (!check_addr("map_single", dev, bus, size))
-               return DMA_ERROR_CODE;
+               return NOMMU_MAPPING_ERROR;
        flush_write_buffers();
        return bus;
 }
@@ -88,6 +90,11 @@ static void nommu_sync_sg_for_device(struct device *dev,
        flush_write_buffers();
 }
 
+static int nommu_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+       return dma_addr == NOMMU_MAPPING_ERROR;
+}
+
 const struct dma_map_ops nommu_dma_ops = {
        .alloc                  = dma_generic_alloc_coherent,
        .free                   = dma_generic_free_coherent,
@@ -96,4 +103,5 @@ const struct dma_map_ops nommu_dma_ops = {
        .sync_single_for_device = nommu_sync_single_for_device,
        .sync_sg_for_device     = nommu_sync_sg_for_device,
        .is_phys                = 1,
+       .mapping_error          = nommu_mapping_error,
 };
-- 
2.11.0


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