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-rw-r--r--block/graph-lock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/graph-lock.c b/block/graph-lock.c
index 58a799065f..e5525ee2db 100644
--- a/block/graph-lock.c
+++ b/block/graph-lock.c
@@ -106,12 +106,13 @@ static uint32_t reader_count(void)
     return rd;
 }
 
-void bdrv_graph_wrlock(BlockDriverState *bs)
+void no_coroutine_fn bdrv_graph_wrlock(BlockDriverState *bs)
 {
     AioContext *ctx = NULL;
 
     GLOBAL_STATE_CODE();
     assert(!qatomic_read(&has_writer));
+    assert(!qemu_in_coroutine());
 
     /*
      * Release only non-mainloop AioContext. The mainloop often relies on the