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[Qemu-devel] [PATCH v2 16/16] hw/intc/nvic: Use object_initialize_child

From: Philippe Mathieu-Daudé
Subject: [Qemu-devel] [PATCH v2 16/16] hw/intc/nvic: Use object_initialize_child for correct reference counting
Date: Tue, 7 May 2019 18:34:16 +0200

As explained in commit aff39be0ed97:

  Both functions, object_initialize() and object_property_add_child()
  increase the reference counter of the new object, so one of the
  references has to be dropped afterwards to get the reference
  counting right. Otherwise the child object will not be properly
  cleaned up when the parent gets destroyed.
  Thus let's use now object_initialize_child() instead to get the
  reference counting here right.

This patch was generated using the following Coccinelle script:

 expression child_ptr;
 expression child_type;
 expression child_size;
 -   object_initialize(child_ptr, child_size, child_type);
 -   qdev_set_parent_bus(DEVICE(child_ptr), sysbus_get_default());
 ?-  object_unref(OBJECT(child_ptr));
 +   sysbus_init_child_obj(OBJECT(PARENT_OBJ), "CHILD_NAME", child_ptr,
 +                         child_size, child_type);

We let NVIC adopt the SysTick timer.

While the object_initialize() function doesn't take an
'Error *errp' argument, the object_initialize_child() does.
Since this code is used when a machine is created (and is not
yet running), we deliberately choose to use the &error_abort
argument instead of ignoring errors if an object creation failed.
This choice also matches when using sysbus_init_child_obj(),
since its code is:

  void sysbus_init_child_obj(Object *parent,
                             const char *childname, void *child,
                             size_t childsize, const char *childtype)
      object_initialize_child(parent, childname, child, childsize,
                              childtype, &error_abort, NULL);

      qdev_set_parent_bus(DEVICE(child), sysbus_get_default());

Suggested-by: Eduardo Habkost <address@hidden>
Inspired-by: Thomas Huth <address@hidden>
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
 hw/intc/armv7m_nvic.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c
index fff6e694e60..2334fe51426 100644
--- a/hw/intc/armv7m_nvic.c
+++ b/hw/intc/armv7m_nvic.c
@@ -2568,9 +2568,9 @@ static void armv7m_nvic_realize(DeviceState *dev, Error 
          * as we didn't know then if the CPU had the security extensions;
          * so we have to do it here.
-        object_initialize(&s->systick[M_REG_S], sizeof(s->systick[M_REG_S]),
-                          TYPE_SYSTICK);
-        qdev_set_parent_bus(DEVICE(&s->systick[M_REG_S]), 
+        sysbus_init_child_obj(OBJECT(dev), "systick-reg-s",
+                              &s->systick[M_REG_S],
+                              sizeof(s->systick[M_REG_S]), TYPE_SYSTICK);
         object_property_set_bool(OBJECT(&s->systick[M_REG_S]), true,
                                  "realized", &err);

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