diff mbox series

[PULL,17/28] block: Take graph rdlock in bdrv_drop_intermediate()

Message ID 20230915144344.238596-18-kwolf@redhat.com (mailing list archive)
State New, archived
Headers show
Series [PULL,01/28] block: Remove unused BlockReopenQueueEntry.perms_checked | expand

Commit Message

Kevin Wolf Sept. 15, 2023, 2:43 p.m. UTC 
The function reads the parents list, so it needs to hold the graph lock.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-ID: <20230911094620.45040-18-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/block.c b/block.c
index 06d2a1b256..e024a6ccec 100644
--- a/block.c
+++ b/block.c
@@ -5938,9 +5938,11 @@  int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
         backing_file_str = base->filename;
     }
 
+    bdrv_graph_rdlock_main_loop();
     QLIST_FOREACH(c, &top->parents, next_parent) {
         updated_children = g_slist_prepend(updated_children, c);
     }
+    bdrv_graph_rdunlock_main_loop();
 
     /*
      * It seems correct to pass detach_subchain=true here, but it triggers