diff --git a/block/parallels.c b/block/parallels.c
index bb279ddc70..84d1d045ad 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -562,30 +562,25 @@ parallels_co_check(BlockDriverState *bs, BdrvCheckResult *res,
     BDRVParallelsState *s = bs->opaque;
     int ret;
 
-    qemu_co_mutex_lock(&s->lock);
+    WITH_QEMU_LOCK_GUARD(&s->lock) {
+        parallels_check_unclean(bs, res, fix);
 
-    parallels_check_unclean(bs, res, fix);
-
-    ret = parallels_check_outside_image(bs, res, fix);
-    if (ret < 0) {
-        goto out;
-    }
-
-    ret = parallels_check_leak(bs, res, fix);
-    if (ret < 0) {
-        goto out;
-    }
-
-    parallels_collect_statistics(bs, res, fix);
-
-out:
-    qemu_co_mutex_unlock(&s->lock);
-
-    if (ret == 0) {
-        ret = bdrv_co_flush(bs);
+        ret = parallels_check_outside_image(bs, res, fix);
         if (ret < 0) {
-            res->check_errors++;
+            return ret;
         }
+
+        ret = parallels_check_leak(bs, res, fix);
+        if (ret < 0) {
+            return ret;
+        }
+
+        parallels_collect_statistics(bs, res, fix);
+    }
+
+    ret = bdrv_co_flush(bs);
+    if (ret < 0) {
+        res->check_errors++;
     }
 
     return ret;