[Qemu-block] [PULL 2/8] blockdev: enable non-root nodes for transaction drive-backup source

[Max Reitz]

From: Vladimir Sementsov-Ogievskiy <address@hidden>

We forget to enable it for transaction .prepare, while it is already
enabled in do_drive_backup since commit a2d665c1bc362
    "blockdev: loosen restrictions on drive-backup source node"

Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
Message-id: address@hidden
Reviewed-by: John Snow <address@hidden>
Signed-off-by: Max Reitz <address@hidden>
---
 blockdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/blockdev.c b/blockdev.c
index 5d6a13dea9..4d141e9a1f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1774,7 +1774,7 @@ static void drive_backup_prepare(BlkActionState *common, 
Error **errp)
     assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
     backup = common->action->u.drive_backup.data;
 
-    bs = qmp_get_root_bs(backup->device, errp);
+    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
     if (!bs) {
         return;
     }
-- 
2.21.0