Re: [Qemu-devel] [PATCH v18 13/14] memory backend: fill memory backend ram fields

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 26 Feb 2014 13:00:03 +0800
Hu Tao <hutao@cn.fujitsu.com> wrote:

> On Tue, Feb 25, 2014 at 03:15:53PM +0100, Paolo Bonzini wrote:
> > Il 25/02/2014 11:20, Hu Tao ha scritto:
> > >There is a problem that user_creatable_complete() is called before
> > >adding object to "/objects" (see object_create()), which triggers a
> > >assert failure when calling object_get_canonical_path() in
> > >ram_backend_memory_init(). Any ideas?
> > 
> > You can call object_property_add_child before calling
> > user_creatable_complete, and then call object_unparent (in addition
> > to object_unref) if creation fails.
> > 
> > Paolo
> 
> Something like this?
> 
> From 59c999c840e4305bb2b95389bbea32e07c1c14c0 Mon Sep 17 00:00:00 2001
> From: Hu Tao <hutao@cn.fujitsu.com>
> Date: Wed, 26 Feb 2014 12:54:34 +0800
> Subject: [PATCH] call user_creatable_complete() after adding object to
>  "/objects"
> 
> This makes it possible to get the path of object by calling
> object_get_canonical_path() in the complete callback if
> someone wants it.
> 
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  vl.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/vl.c b/vl.c
> index 1d27b34..30b4297 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -2770,14 +2770,15 @@ static int object_create(QemuOpts *opts, void *opaque)
>          goto out;
>      }
>  
> +    object_property_add_child(container_get(object_get_root(), "/objects"),
> +                              id, obj, &local_err);
> +
>      user_creatable_complete(obj, &local_err);
>      if (local_err) {
> +        object_unparent(obj);
>          goto out;
>      }
>  
> -    object_property_add_child(container_get(object_get_root(), "/objects"),
> -                              id, obj, &local_err);
> -
>  out:
>      object_unref(obj);
>      if (local_err) {
Failure case is not handled properly,
I'm sorry that I've forgotten to mention prerequisite path
https://github.com/imammedo/qemu/commit/72a079b88e055fc690c8895a99ccbcce36f6fc1f
in stage tree https://github.com/imammedo/qemu/commits/memory-hotplug-v8