dma-debug: check nents in dma_sync_sg*

rmurphy-arm · torvalds · commit 7f8306429c4c · 2015-11-06T17:50:42.000-08:00
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 &lt;robin.murphy@arm.com&gt;
Cc: Arnd Bergmann &lt;arnd@arndb.de&gt;
Cc: Marek Szyprowski &lt;m.szyprowski@samsung.com&gt;
Cc: Sumit Semwal &lt;sumit.semwal@linaro.org&gt;
Cc: Sakari Ailus &lt;sakari.ailus@iki.fi&gt;
Cc: Russell King &lt;rmk+kernel@arm.linux.org.uk&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
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);
 }
