From 04abab698285297115e5096b3100df1064045529 Mon Sep 17 00:00:00 2001 From: Ricardo Ribalda Delgado Date: Wed, 11 Feb 2015 13:53:15 +0100 Subject: [PATCH] include/dma-mapping: Clarify output of dma_map_sg Although dma_map_sg returns 0 on error and it cannot return a value < 0, the function returns a signed integer. Most of the time, this function is used with a scatterlist structure. This structure uses an unsigned integer for the number of memory. A dma developer that has not read in detail DMA-API.txt, can wrongly return a value < 0 on error. Signed-off-by: Ricardo Ribalda Delgado Signed-off-by: Marek Szyprowski --- include/linux/dma-mapping.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index c3007cb4bfa6..ac07ff090919 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -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); -- 2.39.2