hw/arm/armv7: Fix crash when introspecting the "iotkit" device

QEMU currently crashes when introspecting the "iotkit" device and
runnint "info qtree" afterwards, e.g. when running QEMU like this:

echo "{'execute':'qmp_capabilities'} {'execute':'device-list-properties'," \
 "'arguments':{'typename':'iotkit'}}" "{'execute': 'human-monitor-command', " \
 "'arguments': {'command-line': 'info qtree'}}" | \
 aarch64-softmmu/qemu-system-aarch64 -M none,accel=qtest -qmp stdio

Use the new functions object_initialize_child() and sysbus_init_child_obj()
to make sure that all objects get cleaned up correctly when the instances
are destroyed.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1531745974-17187-5-git-send-email-thuth@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
index 9e00d4037c..6b07666057 100644
--- a/hw/arm/armv7m.c
+++ b/hw/arm/armv7m.c
@@ -134,14 +134,13 @@ static void armv7m_instance_init(Object *obj)
 
     memory_region_init(&s->container, obj, "armv7m-container", UINT64_MAX);
 
-    object_initialize(&s->nvic, sizeof(s->nvic), TYPE_NVIC);
-    qdev_set_parent_bus(DEVICE(&s->nvic), sysbus_get_default());
+    sysbus_init_child_obj(obj, "nvnic", &s->nvic, sizeof(s->nvic), TYPE_NVIC);
     object_property_add_alias(obj, "num-irq",
                               OBJECT(&s->nvic), "num-irq", &error_abort);
 
     for (i = 0; i < ARRAY_SIZE(s->bitband); i++) {
-        object_initialize(&s->bitband[i], sizeof(s->bitband[i]), TYPE_BITBAND);
-        qdev_set_parent_bus(DEVICE(&s->bitband[i]), sysbus_get_default());
+        sysbus_init_child_obj(obj, "bitband[*]", &s->bitband[i],
+                              sizeof(s->bitband[i]), TYPE_BITBAND);
     }
 }