x86: move pci-nommu's dma_mask check to common code

The check to see if dev->dma_mask is NULL in pci-nommu is more
appropriate for dma_alloc_coherent().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 3a9a6f5e681a..088c56814aa3 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -254,6 +254,9 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
                 gfp |= GFP_DMA;
         }
 
+        if (!dev->dma_mask)
+                return NULL;
+
         if (ops->alloc_coherent)
                 return ops->alloc_coherent(dev, size,
                                 dma_handle, gfp);