[PATCH v3 3/7] hw/core/register: Do not unparent in instance_finalize()

Akihiko Odaki posted 7 patches 4 months, 3 weeks ago
Maintainers: Alistair Francis <alistair@alistair23.me>, "Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Bin Meng <bmeng.cn@gmail.com>, Alex Williamson <alex.williamson@redhat.com>, "Cédric Le Goater" <clg@redhat.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>
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[PATCH v3 3/7] hw/core/register: Do not unparent in instance_finalize()
Posted by Akihiko Odaki 4 months, 3 weeks ago
Children are automatically unparented so manually unparenting is
unnecessary.

Worse, automatic unparenting happens before the instance_finalize()
callback of the parent gets called, so object_unparent() calls in
the callback will refer to objects that are already unparented, which
is semantically incorrect.

Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
---
 hw/core/register.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/hw/core/register.c b/hw/core/register.c
index 8f63d9f227c4..3340df70b06e 100644
--- a/hw/core/register.c
+++ b/hw/core/register.c
@@ -314,7 +314,6 @@ RegisterInfoArray *register_init_block64(DeviceState *owner,
 
 void register_finalize_block(RegisterInfoArray *r_array)
 {
-    object_unparent(OBJECT(&r_array->mem));
     g_free(r_array->r);
     g_free(r_array);
 }

-- 
2.51.0
Re: [PATCH v3 3/7] hw/core/register: Do not unparent in instance_finalize()
Posted by Daniel P. Berrangé 4 months, 3 weeks ago
On Wed, Sep 17, 2025 at 07:13:28PM +0900, Akihiko Odaki wrote:
> Children are automatically unparented so manually unparenting is
> unnecessary.
> 
> Worse, automatic unparenting happens before the instance_finalize()
> callback of the parent gets called, so object_unparent() calls in
> the callback will refer to objects that are already unparented, which
> is semantically incorrect.
> 
> Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
> ---
>  hw/core/register.c | 1 -
>  1 file changed, 1 deletion(-)
>

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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