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

[Hu Tao <hutao@cn.fujitsu.com>]

On Wed, Feb 26, 2014 at 09:47:08AM +0100, Igor Mammedov wrote:
> 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

No problem. I should've noticed the patch when cherry-picking. Will you
post it seperately?