# \[PATCH 29/44\] dma-noop: remove dma\_supported and mapping\_error methods

- From: Christoph Hellwig \<hch@lst.de\>
- Date: 2017-06-08 13:34:10 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2017/06/5016095
- Thread: https://ratatoskr.run/linux-arm-kernel/2017/06/5016133/t.md

```text
These just duplicate the default behavior if no method is provided.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 lib/dma-noop.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/lib/dma-noop.c b/lib/dma-noop.c
index de26c8b68f34..643a074f139d 100644
--- a/lib/dma-noop.c
+++ b/lib/dma-noop.c
@@ -54,23 +54,11 @@ static int dma_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nent
 	return nents;
 }
 
-static int dma_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-	return 0;
-}
-
-static int dma_noop_supported(struct device *dev, u64 mask)
-{
-	return 1;
-}
-
 const struct dma_map_ops dma_noop_ops = {
 	.alloc			= dma_noop_alloc,
 	.free			= dma_noop_free,
 	.map_page		= dma_noop_map_page,
 	.map_sg			= dma_noop_map_sg,
-	.mapping_error		= dma_noop_mapping_error,
-	.dma_supported		= dma_noop_supported,
 };
 
 EXPORT_SYMBOL(dma_noop_ops);
-- 
2.11.0
```