Re: [Qemu-devel] [RFC PATCH 02/15] qdev: store DeviceState's canonical path to use when unparenting

[Paolo Bonzini]

On 02/05/2015 00:54, Michael Roth wrote:
>> > 
>> > What about unparenting children devices in the device's unrealize
>> > callback?  It sucks that you have to do it manually, but using stale
>> > canonical paths isn't the nicest thing either.
> That does seems to do the trick. It felt wrong when I first looked at
> it because in some cases the children attach themselves to the parent
> without making making the parent aware,

Can you point to an example?  The parent "owns" its property namespace,
so it would be wrong for a child to attach itself unbeknownst to the parent.

There are a couple cases where an object adds a property to another
object, e.g. the rtc-time property of /machine, but in that case the
property is a well-known name whose setting is "outsourced" by /machine
to the device.

Paolo