Commit a5759b2b authored by Miles Chen's avatar Miles Chen Committed by Linus Torvalds
Browse files

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@mediatek.com


Signed-off-by: default avatarMiles Chen <miles.chen@mediatek.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f4200391

lib/dma-debug.c

+5 −0
Original line number Diff line number Diff line
@@ -1155,6 +1155,11 @@ static void check_unmap(struct dma_debug_entry *ref) 
			   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"

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