net: Fix build with ARCH=um

If UM is going to claim that it supports DMA by setting
HAS_DMA, it should provide a dma_mapping_error() implementation.

Based upon a report by Julius Volz.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/asm-um/dma-mapping.h b/include/asm-um/dma-mapping.h
index f0ee4fb55911..90fc708b320e 100644
--- a/include/asm-um/dma-mapping.h
+++ b/include/asm-um/dma-mapping.h
@@ -118,4 +118,11 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
         BUG();
 }
 
+static inline int
+dma_mapping_error(struct device *dev, dma_addr_t dma_handle)
+{
+        BUG();
+        return 0;
+}
+
 #endif