From: Ani Sinha <anisinha@redhat.com>

Currently the code that adds a migration blocker does not check if the same
blocker already exists. Assert that the migration handler being added has
not been added already.

CC: Markus Armbruster <armbru@redhat.com>
CC: Peter Xu <peterx@redhat.com>
CC: Prasad Pandit <pjp@fedoraproject.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260311070114.164434-1-anisinha@redhat.com
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 migration/migration.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/migration/migration.c b/migration/migration.c
index c77832f851..7feeba804f 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1699,6 +1699,8 @@ static int add_blockers(Error **reasonp, unsigned modes, Error **errp)
 {
     for (MigMode mode = 0; mode < MIG_MODE__MAX; mode++) {
         if (modes & BIT(mode)) {
+            assert(g_slist_index(migration_blockers[mode],
+                                 *reasonp) == -1);
             migration_blockers[mode] = g_slist_prepend(migration_blockers[mode],
                                                        *reasonp);
         }
-- 
2.51.0