swiotlb: Skip cache maintenance on map error

[sfrench/cifs-2.6.git] / kernel / dma / swiotlb.c

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 5731daa09a32edc2175657384aee68b60a365a2a..045930e32c0e93d91fab9b28a4329f5b2dc1c356 100644 (file)
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -679,7 +679,8 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
        }
 
        if (!dev_is_dma_coherent(dev) &&
-           (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
+           (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0 &&
+           dev_addr != DIRECT_MAPPING_ERROR)
                arch_sync_dma_for_device(dev, phys, size, dir);
 
        return dev_addr;