The patch titled
Subject: dma-debug: add comment for failed to check map error
has been added to the -mm tree. Its filename is
dma-debug-add-comment-for-failed-to-check-map-error.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dma-debug-add-comment-for-failed-to-check-map-error.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dma-debug-add-comment-for-failed-to-check-map-error.patch
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------------------------------------------------------
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"
_
Patches currently in -mm which might be from miles.chen@xxxxxxxxxxxx are
dma-debug-add-comment-for-failed-to-check-map-error.patch
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