[Qemu-devel] [PULL 09/10] hw/mips: Use object_initialize_child for correct reference counting

[Aleksandar Markovic <aleksandar.markovic@rt-rk.com>]

From: Philippe Mathieu-Daudé <philmd@redhat.com>

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:

 @use_sysbus_init_child_obj_missing_parent@
 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 the Malta/Boston machines adopt the CPS child, and similarly
the CPS adopts the ITU/CPC/GIC/GCR children.

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 <ehabkost@redhat.com>
Inspired-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20190507163416.24647-11-philmd@redhat.com>
---
 hw/mips/boston.c     |  4 ++--
 hw/mips/cps.c        | 20 ++++++++------------
 hw/mips/mips_malta.c |  4 ++--
 3 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/hw/mips/boston.c b/hw/mips/boston.c
index cb3ea85..1ffccc8 100644
--- a/hw/mips/boston.c
+++ b/hw/mips/boston.c
@@ -455,8 +455,8 @@ static void boston_mach_init(MachineState *machine)
 
     is_64b = cpu_supports_isa(machine->cpu_type, ISA_MIPS64);
 
-    object_initialize(&s->cps, sizeof(s->cps), TYPE_MIPS_CPS);
-    qdev_set_parent_bus(DEVICE(&s->cps), sysbus_get_default());
+    sysbus_init_child_obj(OBJECT(machine), "cps", OBJECT(&s->cps),
+                          sizeof(s->cps), TYPE_MIPS_CPS);
     object_property_set_str(OBJECT(&s->cps), machine->cpu_type, "cpu-type",
                             &err);
     object_property_set_int(OBJECT(&s->cps), smp_cpus, "num-vp", &err);
diff --git a/hw/mips/cps.c b/hw/mips/cps.c
index fc97f59..649b35a 100644
--- a/hw/mips/cps.c
+++ b/hw/mips/cps.c
@@ -94,9 +94,8 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
 
     /* Inter-Thread Communication Unit */
     if (itu_present) {
-        object_initialize(&s->itu, sizeof(s->itu), TYPE_MIPS_ITU);
-        qdev_set_parent_bus(DEVICE(&s->itu), sysbus_get_default());
-
+        sysbus_init_child_obj(OBJECT(dev), "itu", &s->itu, sizeof(s->itu),
+                              TYPE_MIPS_ITU);
         object_property_set_int(OBJECT(&s->itu), 16, "num-fifo", &err);
         object_property_set_int(OBJECT(&s->itu), 16, "num-semaphores", &err);
         object_property_set_bool(OBJECT(&s->itu), saar_present, "saar-present",
@@ -115,9 +114,8 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
     }
 
     /* Cluster Power Controller */
-    object_initialize(&s->cpc, sizeof(s->cpc), TYPE_MIPS_CPC);
-    qdev_set_parent_bus(DEVICE(&s->cpc), sysbus_get_default());
-
+    sysbus_init_child_obj(OBJECT(dev), "cpc", &s->cpc, sizeof(s->cpc),
+                          TYPE_MIPS_CPC);
     object_property_set_int(OBJECT(&s->cpc), s->num_vp, "num-vp", &err);
     object_property_set_int(OBJECT(&s->cpc), 1, "vp-start-running", &err);
     object_property_set_bool(OBJECT(&s->cpc), true, "realized", &err);
@@ -130,9 +128,8 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
                             sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->cpc), 0));
 
     /* Global Interrupt Controller */
-    object_initialize(&s->gic, sizeof(s->gic), TYPE_MIPS_GIC);
-    qdev_set_parent_bus(DEVICE(&s->gic), sysbus_get_default());
-
+    sysbus_init_child_obj(OBJECT(dev), "gic", &s->gic, sizeof(s->gic),
+                          TYPE_MIPS_GIC);
     object_property_set_int(OBJECT(&s->gic), s->num_vp, "num-vp", &err);
     object_property_set_int(OBJECT(&s->gic), 128, "num-irq", &err);
     object_property_set_bool(OBJECT(&s->gic), true, "realized", &err);
@@ -147,9 +144,8 @@ static void mips_cps_realize(DeviceState *dev, Error **errp)
     /* Global Configuration Registers */
     gcr_base = env->CP0_CMGCRBase << 4;
 
-    object_initialize(&s->gcr, sizeof(s->gcr), TYPE_MIPS_GCR);
-    qdev_set_parent_bus(DEVICE(&s->gcr), sysbus_get_default());
-
+    sysbus_init_child_obj(OBJECT(dev), "gcr", &s->gcr, sizeof(s->gcr),
+                          TYPE_MIPS_GCR);
     object_property_set_int(OBJECT(&s->gcr), s->num_vp, "num-vp", &err);
     object_property_set_int(OBJECT(&s->gcr), 0x800, "gcr-rev", &err);
     object_property_set_int(OBJECT(&s->gcr), gcr_base, "gcr-base", &err);
diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c
index 04f2117..aff8464 100644
--- a/hw/mips/mips_malta.c
+++ b/hw/mips/mips_malta.c
@@ -1151,8 +1151,8 @@ static void create_cps(MaltaState *s, const char *cpu_type,
 {
     Error *err = NULL;
 
-    object_initialize(&s->cps, sizeof(s->cps), TYPE_MIPS_CPS);
-    qdev_set_parent_bus(DEVICE(&s->cps), sysbus_get_default());
+    sysbus_init_child_obj(OBJECT(s), "cps", OBJECT(&s->cps), sizeof(s->cps),
+                          TYPE_MIPS_CPS);
     object_property_set_str(OBJECT(&s->cps), cpu_type, "cpu-type", &err);
     object_property_set_int(OBJECT(&s->cps), smp_cpus, "num-vp", &err);
     object_property_set_bool(OBJECT(&s->cps), true, "realized", &err);
-- 
2.7.4