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

[Thomas Huth <thuth@redhat.com>]

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: 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);

You could fit that into two instead of three lines.

But it's just a cosmetic nit, so:
Reviewed-by: Thomas Huth <thuth@redhat.com>