io: stop incrementing reference in qio_task_get_source

Incrementing the reference in qio_task_get_source is
not necessary, since we're not running concurrently
with any other code touching the QIOTask. This
minimizes chances of further memory leaks.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

include/io/task.h

@@ -244,9 +244,10 @@ void qio_task_abort(QIOTask *task,
  * @task: the task struct
  *
  * Get the source object associated with the background
- * task. This returns a new reference to the object,
- * which the caller must released with object_unref()
- * when no longer required.
+ * task. The caller does not own a reference on the
+ * returned Object, and so should call object_ref()
+ * if it wants to keep the object pointer outside the
+ * lifetime of the QIOTask object.
  *
  * Returns: the source object
  */

io/channel-socket.c

@@ -168,7 +168,6 @@ static int qio_channel_socket_connect_worker(QIOTask *task,
                                           addr,
                                           errp);
 
-    object_unref(OBJECT(ioc));
     return ret;
 }
 
@@ -231,7 +230,6 @@ static int qio_channel_socket_listen_worker(QIOTask *task,
                                          addr,
                                          errp);
 
-    object_unref(OBJECT(ioc));
     return ret;
 }
 
@@ -309,7 +307,6 @@ static int qio_channel_socket_dgram_worker(QIOTask *task,
                                         data->remoteAddr,
                                         errp);
 
-    object_unref(OBJECT(ioc));
     return ret;
 }
 

io/channel-tls.c

@@ -200,8 +200,6 @@ static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
     qio_channel_tls_handshake_task(
        tioc, task);
 
-    object_unref(OBJECT(tioc));
-
     return FALSE;
 }
 

io/task.c

@@ -156,6 +156,5 @@ void qio_task_abort(QIOTask *task,
 
 Object *qio_task_get_source(QIOTask *task)
 {
-    object_ref(task->source);
     return task->source;
 }

tests/test-io-task.c

@@ -76,7 +76,6 @@ static void test_task_complete(void)
     g_assert(obj == src);
 
     object_unref(obj);
-    object_unref(src);
 
     g_assert(data.source == obj);
     g_assert(data.err == NULL);