The function bdrv_set_backing_hd() calls bdrv_drain_all_begin(), which
must be called with the graph unlocked.

Signed-off-by: Fiona Ebner <f.eb...@proxmox.com>
---
 include/block/block-global-state.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/block/block-global-state.h 
b/include/block/block-global-state.h
index 84a2a4ecd5..009b9ac946 100644
--- a/include/block/block-global-state.h
+++ b/include/block/block-global-state.h
@@ -100,8 +100,9 @@ bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp);
 BlockDriverState * coroutine_fn no_co_wrapper
 bdrv_co_open_blockdev_ref(BlockdevRef *ref, Error **errp);
 
-int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
-                        Error **errp);
+int GRAPH_UNLOCKED
+bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
+                    Error **errp);
 int GRAPH_WRLOCK
 bdrv_set_backing_hd_drained(BlockDriverState *bs, BlockDriverState *backing_hd,
                             Error **errp);
-- 
2.39.5



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