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-rw-r--r--blockdev.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/blockdev.c b/blockdev.c
index 325b7a3bef..b6b7c44288 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1041,6 +1041,8 @@ static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
     BlockDriverState *bs;
     AioContext *aio_context;
 
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     bs = bdrv_lookup_bs(name, name, errp);
     if (bs == NULL) {
         return NULL;
@@ -3509,6 +3511,7 @@ void qmp_blockdev_del(const char *node_name, Error **errp)
     BlockDriverState *bs;
 
     GLOBAL_STATE_CODE();
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
 
     bs = bdrv_find_node(node_name);
     if (!bs) {
@@ -3636,6 +3639,8 @@ void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
     AioContext *new_context;
     BlockDriverState *bs;
 
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     bs = bdrv_find_node(node_name);
     if (!bs) {
         error_setg(errp, "Failed to find node with node-name='%s'", node_name);