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: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/net/xilinx_axienet.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/hw/net/xilinx_axienet.c b/hw/net/xilinx_axienet.c
index d8716a1f73..2c8c065401 100644
--- a/hw/net/xilinx_axienet.c
+++ b/hw/net/xilinx_axienet.c
@@ -994,15 +994,14 @@ static void xilinx_enet_init(Object *obj)
     XilinxAXIEnet *s = XILINX_AXI_ENET(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
 
-    object_initialize(&s->rx_data_dev, sizeof(s->rx_data_dev),
-                      TYPE_XILINX_AXI_ENET_DATA_STREAM);
-    object_initialize(&s->rx_control_dev, sizeof(s->rx_control_dev),
-                      TYPE_XILINX_AXI_ENET_CONTROL_STREAM);
-    object_property_add_child(OBJECT(s), "axistream-connected-target",
-                              (Object *)&s->rx_data_dev, &error_abort);
-    object_property_add_child(OBJECT(s), "axistream-control-connected-target",
-                              (Object *)&s->rx_control_dev, &error_abort);
-
+    object_initialize_child(OBJECT(s), "axistream-connected-target",
+                            &s->rx_data_dev, sizeof(s->rx_data_dev),
+                            TYPE_XILINX_AXI_ENET_DATA_STREAM, &error_abort,
+                            NULL);
+    object_initialize_child(OBJECT(s), "axistream-control-connected-target",
+                            &s->rx_control_dev, sizeof(s->rx_control_dev),
+                            TYPE_XILINX_AXI_ENET_CONTROL_STREAM, &error_abort,
+                            NULL);
     sysbus_init_irq(sbd, &s->irq);
 
     memory_region_init_io(&s->iomem, OBJECT(s), &enet_ops, s, "enet", 0x40000);
-- 
2.20.1

On 8/23/19 7:32 AM, Philippe Mathieu-Daudé wrote:
> 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: Alistair Francis <alistair.francis@wdc.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/net/xilinx_axienet.c | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~

On 8/23/19 4:32 PM, Philippe Mathieu-Daudé wrote:
> 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: Alistair Francis <alistair.francis@wdc.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/net/xilinx_axienet.c | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/net/xilinx_axienet.c b/hw/net/xilinx_axienet.c
> index d8716a1f73..2c8c065401 100644
> --- a/hw/net/xilinx_axienet.c
> +++ b/hw/net/xilinx_axienet.c
> @@ -994,15 +994,14 @@ static void xilinx_enet_init(Object *obj)
>      XilinxAXIEnet *s = XILINX_AXI_ENET(obj);
>      SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
>  
> -    object_initialize(&s->rx_data_dev, sizeof(s->rx_data_dev),
> -                      TYPE_XILINX_AXI_ENET_DATA_STREAM);
> -    object_initialize(&s->rx_control_dev, sizeof(s->rx_control_dev),
> -                      TYPE_XILINX_AXI_ENET_CONTROL_STREAM);
> -    object_property_add_child(OBJECT(s), "axistream-connected-target",
> -                              (Object *)&s->rx_data_dev, &error_abort);
> -    object_property_add_child(OBJECT(s), "axistream-control-connected-target",
> -                              (Object *)&s->rx_control_dev, &error_abort);
> -
> +    object_initialize_child(OBJECT(s), "axistream-connected-target",
> +                            &s->rx_data_dev, sizeof(s->rx_data_dev),
> +                            TYPE_XILINX_AXI_ENET_DATA_STREAM, &error_abort,
> +                            NULL);
> +    object_initialize_child(OBJECT(s), "axistream-control-connected-target",
> +                            &s->rx_control_dev, sizeof(s->rx_control_dev),
> +                            TYPE_XILINX_AXI_ENET_CONTROL_STREAM, &error_abort,
> +                            NULL);
>      sysbus_init_irq(sbd, &s->irq);
>  
>      memory_region_init_io(&s->iomem, OBJECT(s), &enet_ops, s, "enet", 0x40000);
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>