block-migration: fix blk_mig_save_dirty_block() return value checking

Commit 43be3a25c931a7f61a76fbfc9d35584cbfc5fb58 changed the
blk_mig_save_dirty_block() return code handling.  The function's doc
comment says:

  /* return value:
   * 0: too much data for max_downtime
   * 1: few enough data for max_downtime
   */

Because of the 1 return value, callers must check for ret < 0 instead of
just:

  if (ret) { ... }

We do not want to bail when 1 is returned, only on error.

Signed-off-by: Stefan Hajnoczi <[email protected]>
Message-id: 1360534366[email protected]
Signed-off-by: Anthony Liguori <[email protected]>

diff --git a/block-migration.c b/block-migration.c
index 573319a305d56f124bcee7f7fcc7e824ead97ce3..a91d96be5e65d1b7cb690ff9ffc195e7b156e1ed 100644 (file)
--- a/block-migration.c
+++ b/block-migration.c
@@ -569,7 +569,7 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
             }
         }
     }
-    if (ret) {
+    if (ret < 0) {
         blk_mig_cleanup();
         return ret;
     }
@@ -609,7 +609,7 @@ static int block_save_complete(QEMUFile *f, void *opaque)
     } while (ret == 0);
 
     blk_mig_cleanup();
-    if (ret) {
+    if (ret < 0) {
         return ret;
     }
     /* report completion */