Re: [Qemu-devel] [PATCH v3 05/11] igd: TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE: call parent realize

[Eduardo Habkost]

On Wed, Jan 06, 2016 at 04:45:01PM +0100, Gerd Hoffmann wrote:
> > >  
> > > +static void (*i440fx_realize)(PCIDevice *pci_dev, Error **errp);
> > >  static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp)
> > >  {
> > > +    Error *err = NULL;
> > >      uint32_t val = 0;
> > >      int rc, i, num;
> > >      int pos, len;
> > 
> > Can't we get the parent PCIDeviceClass realize function from pci_dev? So
> > that we don't have to introduce i440fx_realize?
> 
> I don't think so ...
> 
> > >  
> > > +    i440fx_realize = k->realize;
> > >      k->realize = igd_pt_i440fx_realize;
> 
> ... because we are overriding it right here.

Many device classes have a parent_realize field so they can keep
a pointer to the original realize function. It's better than a
static variable.

-- 
Eduardo