Re: [RFC PATCH 5/5] hw/ppc/pnv_bmc: Simplify pnv_bmc_find()

[Markus Armbruster <armbru@redhat.com>]

Philippe Mathieu-Daudé <philmd@linaro.org> writes:

> ForeachArgs::name is only used once as TYPE_IPMI_BMC.
> Since the penultimate commit, object_child_foreach_recursive()'s
> handler takes an Error* argument and return a boolean.
> We can directly pass ForeachArgs::obj as context, removing the
> ForeachArgs structure.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
> RFC: please double-check...
>
>  hw/ppc/pnv_bmc.c | 25 +++++++++----------------
>  1 file changed, 9 insertions(+), 16 deletions(-)
>
> diff --git a/hw/ppc/pnv_bmc.c b/hw/ppc/pnv_bmc.c
> index 05acc88a55..566284469f 100644
> --- a/hw/ppc/pnv_bmc.c
> +++ b/hw/ppc/pnv_bmc.c
> @@ -278,36 +278,29 @@ IPMIBmc *pnv_bmc_create(PnvPnor *pnor)
>      return IPMI_BMC(obj);
>  }
>  
> -typedef struct ForeachArgs {
> -    const char *name;
> -    Object *obj;
> -} ForeachArgs;
> -
>  static bool bmc_find(Object *child, void *opaque, Error **errp)
>  {
> -    ForeachArgs *args = opaque;
> +    Object **obj = opaque;
>  
> -    if (object_dynamic_cast(child, args->name)) {
> -        if (args->obj) {
> -            return false;
> +    if (object_dynamic_cast(child, TYPE_IPMI_BMC)) {
> +        if (*obj) {
> +            return true;

Looks like you're changing return false to return true.  Intendional?

>          }
> -        args->obj = child;
> +        *obj = child;
>      }
>      return true;
>  }
>  
>  IPMIBmc *pnv_bmc_find(Error **errp)
>  {
> -    ForeachArgs args = { TYPE_IPMI_BMC, NULL };
> -    int ret;
> +    Object *obj = NULL;
>  
> -    ret = object_child_foreach_recursive(object_get_root(), bmc_find,
> -                                         &args, NULL);
> -    if (ret) {
> +    if (!object_child_foreach_recursive(object_get_root(), bmc_find, &obj,
> +                                        NULL)) {
>          error_setg(errp, "machine should have only one BMC device. "
>                     "Use '-nodefaults'");
>          return NULL;
>      }
>  
> -    return args.obj ? IPMI_BMC(args.obj) : NULL;
> +    return IPMI_BMC(obj);
>  }