From b22ff1fbed9d7f1f677804cbaa9ee03ca17d0013 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 17 Oct 2012 21:06:31 +0200
Subject: [PATCH] migration: Only go to the iterate stage if there is anything
 to send

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

Reviewed-by: Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
 migration.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migration.c b/migration.c
index 6d3aeeda51..fe1a103abe 100644
--- a/migration.c
+++ b/migration.c
@@ -698,7 +698,7 @@ static void *buffered_file_thread(void *opaque)
             DPRINTF("iterate\n");
             pending_size = qemu_savevm_state_pending(s->file, max_size);
             DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
-            if (pending_size >= max_size) {
+            if (pending_size && pending_size >= max_size) {
                 ret = qemu_savevm_state_iterate(s->file);
                 if (ret < 0) {
                     qemu_mutex_unlock_iothread();
-- 
2.11.0