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Merge branch 'for-v4.1-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 

Pull DMA-mapping updates from Marek Szyprowski:
 "This contains two patches, which clarify abiguity in the dma-mapping
  api"

* 'for-v4.1-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  include/dma-mapping: Clarify output of dma_map_sg
  asm/dma-mapping-common: Clarify output of dma_map_sg_attrs
This commit is contained in:
Linus Torvalds 2015-04-16 18:50:27 -04:00
parent 45701e2636 04abab6982
commit eabbfdecda
2 changed files with 9 additions and 0 deletions
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5
include/asm-generic/dma-mapping-common.h
View File

@ -39,6 +39,10 @@ static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
debug_dma_unmap_page(dev, addr, size, dir, true);
}
/*
* dma_maps_sg_attrs returns 0 on error and > 0 on success.
* It should never return a value < 0.
*/
static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs)
@ -51,6 +55,7 @@ static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
kmemcheck_mark_initialized(sg_virt(s), s->length);
BUG_ON(!valid_dma_direction(dir));
ents = ops->map_sg(dev, sg, nents, dir, attrs);
BUG_ON(ents < 0);
debug_dma_map_sg(dev, sg, nents, ents, dir);
return ents;

4
include/linux/dma-mapping.h
View File

@ -34,6 +34,10 @@ struct dma_map_ops {
void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs);
/*
* map_sg returns 0 on error and a value > 0 on success.
* It should never return a value < 0.
*/
int (*map_sg)(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs);