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

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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>
This commit is contained in:
Christoph Hellwig 2021-08-09 17:19:36 +02:00
parent d03c544192
commit 2a047e0662
2 changed files with 6 additions and 5 deletions
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9
include/linux/dma-mapping.h
View file

@ -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;
}

2
kernel/dma/mapping.c
View file

@ -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;