x86: move dma_unmap_sg to common header

i386 gets an empty function.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 09011546a48b..6e7747a23e5b 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -82,4 +82,13 @@ dma_map_sg(struct device *hwdev, struct scatterlist *sg,
         BUG_ON(!valid_dma_direction(direction));
         return dma_ops->map_sg(hwdev, sg, nents, direction);
 }
+
+static inline void
+dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
+             int direction)
+{
+        BUG_ON(!valid_dma_direction(direction));
+        if (dma_ops->unmap_sg)
+                dma_ops->unmap_sg(hwdev, sg, nents, direction);
+}
 #endif