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 <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Marek Szyprowski <[email protected]> Cc: Sumit Semwal <[email protected]> Cc: Sakari Ailus <[email protected]> Cc: Russell King <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
iegor · Nov 7, 2015 · 7f83064 · 7f83064
1 parent 002edb6
commit 7f83064
Showing 1 changed file with 8 additions and 0 deletions.
diff --git 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);
 }