Re: [Qemu-devel] [PATCH v2 14/27] qdev: allow reusing get/set for legacy property

[Anthony Liguori <anthony@codemonkey.ws>]

On 02/04/2012 02:02 AM, Paolo Bonzini wrote:
> In some cases, a legacy property does need a special print method
> but not a special parse method.  In this case, we can reuse the get/set
> from the static (non-legacy) property.
>
> If neither parse nor print is needed, though, do not register the
> legacy property at all.  The previous patch ensures that the right
> fallback will be used.
>
> Signed-off-by: Paolo Bonzini<pbonzini@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>   hw/qdev.c |   11 +++++++----
>   1 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/hw/qdev.c b/hw/qdev.c
> index a731e41..660ee38 100644
> --- a/hw/qdev.c
> +++ b/hw/qdev.c
> @@ -550,21 +550,24 @@ static void qdev_set_legacy_property(Object *obj, Visitor *v, void *opaque,
>    * Do not use this is new code!  Properties added through this interface will
>    * be given names and types in the "legacy" namespace.
>    *
> - * Legacy properties are always processed as strings.  The format of the string
> - * depends on the property type.
> + * Legacy properties are string versions of other OOM properties.  The format
> + * of the string depends on the property type.
>    */
>   void qdev_property_add_legacy(DeviceState *dev, Property *prop,
>                                 Error **errp)
>   {
>       gchar *name, *type;
>
> +    if (!prop->info->print&&  !prop->info->parse) {
> +        return;
> +    }
>       name = g_strdup_printf("legacy-%s", prop->name);
>       type = g_strdup_printf("legacy<%s>",
>                              prop->info->legacy_name ?: prop->info->name);
>
>       object_property_add(OBJECT(dev), name, type,
> -                        prop->info->print ? qdev_get_legacy_property : NULL,
> -                        prop->info->parse ? qdev_set_legacy_property : NULL,
> +                        prop->info->print ? qdev_get_legacy_property : prop->info->get,
> +                        prop->info->parse ? qdev_set_legacy_property : prop->info->set,
>                           NULL,
>                           prop, errp);
>