linux-kernel - Re: [PATCH 32/36] driver core: Introduce device

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Date:	Mon, 8 Jan 2007 14:21:48 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 32/36] driver core: Introduce device_move(): move a
 device to a new parent.

On Tue, 05 Dec 2006 16:26:11 +0100,
Marcel Holtmann <marcel@...tmann.org> wrote:

[sorry about the late reply, but I've been on vacation & offline]

> I was checking why device_move() fails and it seems that the check for
> is_registered is the problem here.
> 
>         if (!device_is_registered(dev)) {
>                 error = -EINVAL;
>                 goto out;
>         }
> 
> The ACL link has been attached to the Bluetooth bus, but for some reason
> it still thinks that it is unregistered. Is this check really needed. I
> think it should be possible to also move devices that are not part of a
> bus, yet. And removing that check makes it work for me.

Hm, device_is_registered() is always false for devices not belonging to
a bus. I'll remove that check.

> > > > > And shouldn't device_move(dev, NULL) re-attach it to the virtual device
> > > > > tree instead of failing?
> > > >
> > > > Yes, that would be good to have.
> > >
> > > Cornelia, please fix this, because otherwise we can't detach a device
> > > from its parent. Storing the current virtual parent looks racy to me.
> >
> > You can always restore the previous "virtual" parent from the
> > information given to you in the device itself.  That is what the code
> > does when it first registers the device.
> >
> > And yes, I too think it should be fixed.
> 
> My knowledge of the driver model is still limited. Can you fix that
> quickly. This is really needed.

I'm currently working on a patch. Sorry for the delay, I hope I can get
it out today.

-- 
Cornelia Huck
Linux for zSeries Developer
Tel.: +49-7031-16-4837, Mail: cornelia.huck@...ibm.com
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