Re: [Qemu-devel] [PATCH 07/16] qdev: allow reusing get/set for legacy property

["Andreas Färber" <afaerber@suse.de>]

Am 02.02.2012 17:45, schrieb Paolo Bonzini:
> 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>
> ---
>  hw/qdev-monitor.c    |    5 ++---
>  hw/qdev-properties.c |    6 +++---
>  hw/qdev.c            |   11 +++++++----
>  3 files changed, 12 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
> index 64505b4..e21bd50 100644
> --- a/hw/qdev-monitor.c
> +++ b/hw/qdev-monitor.c
> @@ -489,8 +489,8 @@ static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
>  {
>      if (!props)
>          return;
> -    while (props->name) {
> -        Error *err;
> +    for (; props->name; props++) {
> +        Error *err = NULL;

Do either of these fix a bug? Should be mentioned or avoided.

>          char *value;
>          char *legacy_name = g_strdup_printf("legacy-%s", props->name);
>          if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
> @@ -507,7 +507,6 @@ static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
>          qdev_printf("%s-prop: %s = %s\n", prefix, props->name,
>                      value && *value ? value : "<null>");
>          g_free(value);
> -        props++;
>      }
>  }
>  
> diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
> index 7c41140..16f9b22 100644
> --- a/hw/qdev-properties.c
> +++ b/hw/qdev-properties.c
> @@ -1025,13 +1025,13 @@ void error_set_from_qdev_prop_error(Error **errp, int ret, DeviceState *dev,
>  int qdev_prop_parse(DeviceState *dev, const char *name, const char *value)
>  {
>      char *legacy_name;
> -    Error *err;
> +    Error *err = NULL;
>  
>      legacy_name = g_strdup_printf("legacy-%s", name);
>      if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
> -        object_property_set_str(OBJECT(dev), legacy_name, value, &err);
> +        object_property_set_str(OBJECT(dev), value, legacy_name, &err);
>      } else {
> -        object_property_set_str(OBJECT(dev), name, value, &err);
> +        object_property_set_str(OBJECT(dev), value, name, &err);
>      }

Bugfix?

>      g_free(legacy_name);
>  

Andreas

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