[Qemu-devel] [PATCH v2 2/6] hw/arm: Use object_initialize_child for correct reference counting

["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.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/arm/mcimx7d-sabre.c |  9 ++++-----
 hw/arm/mps2-tz.c       | 15 +++++++--------
 hw/arm/musca.c         |  9 +++++----
 3 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/hw/arm/mcimx7d-sabre.c b/hw/arm/mcimx7d-sabre.c
index 97b8bb788a..78b87c502f 100644
--- a/hw/arm/mcimx7d-sabre.c
+++ b/hw/arm/mcimx7d-sabre.c
@@ -30,7 +30,6 @@ static void mcimx7d_sabre_init(MachineState *machine)
 {
     static struct arm_boot_info boot_info;
     MCIMX7Sabre *s = g_new0(MCIMX7Sabre, 1);
-    Object *soc;
     int i;
 
     if (machine->ram_size > FSL_IMX7_MMDC_SIZE) {
@@ -49,10 +48,10 @@ static void mcimx7d_sabre_init(MachineState *machine)
         .nb_cpus = machine->smp.cpus,
     };
 
-    object_initialize(&s->soc, sizeof(s->soc), TYPE_FSL_IMX7);
-    soc = OBJECT(&s->soc);
-    object_property_add_child(OBJECT(machine), "soc", soc, &error_fatal);
-    object_property_set_bool(soc, true, "realized", &error_fatal);
+    object_initialize_child(OBJECT(machine), "soc",
+                            &s->soc, sizeof(s->soc),
+                            TYPE_FSL_IMX7, &error_fatal, NULL);
+    object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_fatal);
 
     memory_region_allocate_system_memory(&s->ram, NULL, "mcimx7d-sabre.ram",
                                          machine->ram_size);
diff --git a/hw/arm/mps2-tz.c b/hw/arm/mps2-tz.c
index d85dc2c4bd..6b24aaacde 100644
--- a/hw/arm/mps2-tz.c
+++ b/hw/arm/mps2-tz.c
@@ -427,10 +427,10 @@ static void mps2tz_common_init(MachineState *machine)
     /* The sec_resp_cfg output from the IoTKit must be split into multiple
      * lines, one for each of the PPCs we create here, plus one per MSC.
      */
-    object_initialize(&mms->sec_resp_splitter, sizeof(mms->sec_resp_splitter),
-                      TYPE_SPLIT_IRQ);
-    object_property_add_child(OBJECT(machine), "sec-resp-splitter",
-                              OBJECT(&mms->sec_resp_splitter), &error_abort);
+    object_initialize_child(OBJECT(machine), "sec-resp-splitter",
+                            &mms->sec_resp_splitter,
+                            sizeof(mms->sec_resp_splitter),
+                            TYPE_SPLIT_IRQ, &error_abort, NULL);
     object_property_set_int(OBJECT(&mms->sec_resp_splitter),
                             ARRAY_SIZE(mms->ppc) + ARRAY_SIZE(mms->msc),
                             "num-lines", &error_fatal);
@@ -465,10 +465,9 @@ static void mps2tz_common_init(MachineState *machine)
      * Tx, Rx and "combined" IRQs are sent to the NVIC separately.
      * Create the OR gate for this.
      */
-    object_initialize(&mms->uart_irq_orgate, sizeof(mms->uart_irq_orgate),
-                      TYPE_OR_IRQ);
-    object_property_add_child(OBJECT(mms), "uart-irq-orgate",
-                              OBJECT(&mms->uart_irq_orgate), &error_abort);
+    object_initialize_child(OBJECT(mms), "uart-irq-orgate",
+                            &mms->uart_irq_orgate, sizeof(mms->uart_irq_orgate),
+                            TYPE_OR_IRQ, &error_abort, NULL);
     object_property_set_int(OBJECT(&mms->uart_irq_orgate), 10, "num-lines",
                             &error_fatal);
     object_property_set_bool(OBJECT(&mms->uart_irq_orgate), true,
diff --git a/hw/arm/musca.c b/hw/arm/musca.c
index ddd8842732..68db4b5b38 100644
--- a/hw/arm/musca.c
+++ b/hw/arm/musca.c
@@ -424,10 +424,11 @@ static void musca_init(MachineState *machine)
      * The sec_resp_cfg output from the SSE-200 must be split into multiple
      * lines, one for each of the PPCs we create here.
      */
-    object_initialize(&mms->sec_resp_splitter, sizeof(mms->sec_resp_splitter),
-                      TYPE_SPLIT_IRQ);
-    object_property_add_child(OBJECT(machine), "sec-resp-splitter",
-                              OBJECT(&mms->sec_resp_splitter), &error_fatal);
+    object_initialize_child(OBJECT(machine), "sec-resp-splitter",
+                            &mms->sec_resp_splitter,
+                            sizeof(mms->sec_resp_splitter),
+                            TYPE_SPLIT_IRQ, &error_fatal, NULL);
+
     object_property_set_int(OBJECT(&mms->sec_resp_splitter),
                             ARRAY_SIZE(mms->ppc), "num-lines", &error_fatal);
     object_property_set_bool(OBJECT(&mms->sec_resp_splitter), true,
-- 
2.20.1