From: Miles Chen <miles.chen@xxxxxxxxxxxx> Subject: dma-debug: add comment for failed to check map error Add comment for failure to check a map error to help driver developers. Link: http://lkml.kernel.org/r/1484622289-22085-1-git-send-email-miles.chen@xxxxxxxxxxxx Signed-off-by: Miles Chen <miles.chen@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/dma-debug.c | 5 +++++ 1 file changed, 5 insertions(+) diff -puN lib/dma-debug.c~dma-debug-add-comment-for-failed-to-check-map-error lib/dma-debug.c --- a/lib/dma-debug.c~dma-debug-add-comment-for-failed-to-check-map-error +++ a/lib/dma-debug.c @@ -1155,6 +1155,11 @@ static void check_unmap(struct dma_debug dir2name[ref->direction]); } + /* + * Drivers should use dma_mapping_error() to check the returned + * addresses of dma_map_single() and dma_map_page(). + * If not, print this warning message. See Documentation/DMA-API.txt. + */ if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { err_printk(ref->dev, entry, "DMA-API: device driver failed to check map error" _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
