[Qemu-devel] Re: [PATCH] qdev: Reset hotplugged devices

[Anthony Liguori]

On 08/23/2010 06:25 AM, Paolo Bonzini wrote:
> On 08/20/2010 08:12 PM, Anthony Liguori wrote:
> > +/* Returns false to terminate walk; true to continue */
> > +typedef int (qdev_walkerfn)(DeviceState *dev, void *opaque);
> > +
>
> Since you're introducing qbus_walk_children, I suggest a different 
> interface: qdev_walkerfn should return 0 to walk children, -1 to skip 
> walking children, and anything else to terminate walk.  If anything 
> ever returns x > 0, qbus_walk_children returns that x, else 
> qbus_walk_children returns 0.  This interface is inspired by a similar 
> one in GCC and it works well.

Good suggestion.

Regards,

Anthony Liguori

> If you don't want to introduce the full complication, removing the "-1 
> to skip walking children" part would still give the same flexibility 
> WRT to the return values, which is the important part.
>
> Paolo