dma-debug: check for sg_call_ents in best-fit algorithm too

If we don't check for sg_call_ents the hash_bucket_find function might
still return the wrong dma_debug_entry for sg mappings.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

lib/dma-debug.c

@@ -262,11 +262,12 @@ static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
 		 */
 		matches += 1;
 		match_lvl = 0;
-		entry->size      == ref->size      ? ++match_lvl : match_lvl;
-		entry->type      == ref->type      ? ++match_lvl : match_lvl;
-		entry->direction == ref->direction ? ++match_lvl : match_lvl;
+		entry->size         == ref->size         ? ++match_lvl : 0;
+		entry->type         == ref->type         ? ++match_lvl : 0;
+		entry->direction    == ref->direction    ? ++match_lvl : 0;
+		entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
 
-		if (match_lvl == 3) {
+		if (match_lvl == 4) {
 			/* perfect-fit - return the result */
 			return entry;
 		} else if (match_lvl > last_lvl) {
@@ -1076,16 +1077,14 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
 			.dev_addr       = sg_dma_address(s),
 			.size           = sg_dma_len(s),
 			.direction      = dir,
-			.sg_call_ents   = 0,
+			.sg_call_ents   = nelems,
 		};
 
 		if (mapped_ents && i >= mapped_ents)
 			break;
 
-		if (!i) {
-			ref.sg_call_ents = nelems;
+		if (!i)
 			mapped_ents = get_nr_mapped_entries(dev, s);
-		}
 
 		check_unmap(&ref);
 	}