From: Ani Sinha <[email protected]>

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 <[email protected]>
CC: Peter Xu <[email protected]>
CC: Prasad Pandit <[email protected]>
Reviewed-by: Peter Xu <[email protected]>
Signed-off-by: Ani Sinha <[email protected]>
Link: 
https://lore.kernel.org/qemu-devel/[email protected]
Signed-off-by: Fabiano Rosas <[email protected]>
---
 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


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