Re: [PATCH v1 1/1] core/register: Specify instance_size in the TypeInfo

[Eduardo Habkost <ehabkost@redhat.com>]

On Fri, Aug 21, 2020 at 10:33:06PM -0700, Alistair Francis wrote:
> Reported-by: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
> ---
>  hw/core/register.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/core/register.c b/hw/core/register.c
> index ddf91eb445..5e8e8199d0 100644
> --- a/hw/core/register.c
> +++ b/hw/core/register.c
> @@ -180,11 +180,7 @@ void register_init(RegisterInfo *reg)
>  {
>      assert(reg);
>  
> -    if (!reg->data || !reg->access) {
> -        return;
> -    }
>  
> -    object_initialize((void *)reg, sizeof(*reg), TYPE_REGISTER);
>  }
>  
>  void register_write_memory(void *opaque, hwaddr addr,
> @@ -269,13 +265,20 @@ static RegisterInfoArray *register_init_block(DeviceState *owner,
>          int index = rae[i].addr / data_size;
>          RegisterInfo *r = &ri[index];
>  
> +        if (data + data_size * index == 0 || !&rae[i]) {
> +            continue;
> +        }
> +
> +        /* Init the register, this will zero it. */
> +        object_initialize((void *)r, sizeof(*r), TYPE_REGISTER);
> +
> +        /* Set the properties of the register */
>          *r = (RegisterInfo) {
>              .data = data + data_size * index,
>              .data_size = data_size,
>              .access = &rae[i],
>              .opaque = owner,
>          };

This doesn't look right.  Won't this wipe out all DeviceState
data in r->parent_obj?

> -        register_init(r);
>  
>          r_array->r[i] = r;
>      }
> @@ -329,6 +332,7 @@ static const TypeInfo register_info = {
>      .name  = TYPE_REGISTER,
>      .parent = TYPE_DEVICE,
>      .class_init = register_class_init,
> +    .instance_size = sizeof(RegisterInfo),
>  };
>  
>  static void register_register_types(void)
> -- 
> 2.28.0
> 
> 

-- 
Eduardo