Re: [PATCH-for-5.1] hw/isa/isa-superio: Fix IDE controller realization

[Markus Armbruster]

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> When realizing a Super I/O with IDE controller [*], we get:
>
>   qom/object.c:1684: object_property_try_add_child: Assertion 
> `!child->parent' failed.
>   Aborted (core dumped)
>
> This is because the device is already realized when we try to
> add the QOM property to the parent. Fix by realizing *after*
> adding the QOM relationship.
>
> [*] Set ISASuperIOClass::ide.count = N with N not zero

Is this a latent bug, or can it bite in master?  If the latter, can you
show how to reproduce?

> Fixes: e508430619 ("hw/isa/superio: Make the components QOM children")
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
>  hw/isa/isa-superio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/isa/isa-superio.c b/hw/isa/isa-superio.c
> index e2e47d8fd9..179c185695 100644
> --- a/hw/isa/isa-superio.c
> +++ b/hw/isa/isa-superio.c
> @@ -158,8 +158,8 @@ static void isa_superio_realize(DeviceState *dev, Error 
> **errp)
>          if (k->ide.get_irq) {
>              qdev_prop_set_uint32(d, "irq", k->ide.get_irq(sio, 0));
>          }
> -        isa_realize_and_unref(isa, bus, &error_fatal);
>          object_property_add_child(OBJECT(sio), "isa-ide", OBJECT(isa));
> +        isa_realize_and_unref(isa, bus, &error_fatal);
>          sio->ide = isa;
>          trace_superio_create_ide(0,
>                                   k->ide.get_iobase ?