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-rw-r--r--lib/dma-debug.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 8971370bfb16..b157b46cc9a6 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -17,8 +17,10 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/sched/task_stack.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
+#include <linux/sched/task.h>
#include <linux/stacktrace.h>
#include <linux/dma-debug.h>
#include <linux/spinlock.h>
@@ -1155,6 +1157,11 @@ 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"