diff options
| -rw-r--r-- | block/stream.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/block/stream.c b/block/stream.c index 930e3cf37b..25f98e493c 100644 --- a/block/stream.c +++ b/block/stream.c @@ -235,11 +235,14 @@ wait: } if (!block_job_is_cancelled(&s->common) && sector_num == end && ret == 0) { - const char *base_id = NULL; + const char *base_id = NULL, *base_fmt = NULL; if (base) { base_id = s->backing_file_id; + if (base->drv) { + base_fmt = base->drv->format_name; + } } - ret = bdrv_change_backing_file(bs, base_id, NULL); + ret = bdrv_change_backing_file(bs, base_id, base_fmt); close_unused_images(bs, base, base_id); } |