dma-mapping: return an unsigned int from dma_map_sg{,_attrs}

These can only return 0 for failure or the number of entries, so turn
the return value into an unsigned int.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>

include/linux/dma-mapping.h

@@ -105,8 +105,8 @@ dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page,
 		unsigned long attrs);
 void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size,
 		enum dma_data_direction dir, unsigned long attrs);
-int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents,
-		enum dma_data_direction dir, unsigned long attrs);
+unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+		int nents, enum dma_data_direction dir, unsigned long attrs);
 void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
 				      int nents, enum dma_data_direction dir,
 				      unsigned long attrs);
@@ -166,8 +166,9 @@ static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,
 		size_t size, enum dma_data_direction dir, unsigned long attrs)
 {
 }
-static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
-		int nents, enum dma_data_direction dir, unsigned long attrs)
+static inline unsigned int dma_map_sg_attrs(struct device *dev,
+		struct scatterlist *sg, int nents, enum dma_data_direction dir,
+		unsigned long attrs)
 {
 	return 0;
 }

kernel/dma/mapping.c

@@ -219,7 +219,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
  * dma_unmap_sg_attrs() should be used to unmap the buffer with the
  * original sg and original nents (not the value returned by this funciton).
  */
-int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
+unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
 		    int nents, enum dma_data_direction dir, unsigned long attrs)
 {
 	int ret;