dma-debug: check nents in dma_sync_sg*

Like dma_unmap_sg, dma_sync_sg* should be called with the original number
of entries passed to dma_map_sg, so do the same check in the sync path as
we do in the unmap path.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index fcb65d2a0b94..8855f019ebe8 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1249,6 +1249,14 @@ static void check_sync(struct device *dev,
                                 dir2name[entry->direction],
                                 dir2name[ref->direction]);
 
+        if (ref->sg_call_ents && ref->type == dma_debug_sg &&
+            ref->sg_call_ents != entry->sg_call_ents) {
+                err_printk(ref->dev, entry, "DMA-API: device driver syncs "
+                           "DMA sg list with different entry count "
+                           "[map count=%d] [sync count=%d]\n",
+                           entry->sg_call_ents, ref->sg_call_ents);
+        }
+
 out:
         put_hash_bucket(bucket, &flags);
 }