[PATCH 13/14] migration: Use migrate_has_error() in close_return_path_on_source()

[Cédric Le Goater]

close_return_path_on_source() retrieves the migration error from the
the QEMUFile '->to_dst_file' to know if a shutdown is required. This
shutdown is required to exit the return-path thread. However, in
migrate_fd_cleanup(), '->to_dst_file' is cleaned up before calling
close_return_path_on_source() and the shutdown is never performed,
leaving the source and destination waiting for an event to occur.

Avoid relying on '->to_dst_file' and use migrate_has_error() instead.

Suggested-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
 migration/migration.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index 
d5f705ceef4c925589aa49335969672c0d761fa2..5f55af3d7624750ca416c4177781241b3e291e5d
 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2372,8 +2372,7 @@ static bool close_return_path_on_source(MigrationState 
*ms)
      * cause it to unblock if it's stuck waiting for the destination.
      */
     WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) {
-        if (ms->to_dst_file && ms->rp_state.from_dst_file &&
-            qemu_file_get_error(ms->to_dst_file)) {
+        if (migrate_has_error(ms) && ms->rp_state.from_dst_file) {
             qemu_file_shutdown(ms->rp_state.from_dst_file);
         }
     }
-- 
2.43.0