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

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Date:	Mon, 04 Dec 2006 22:15:03 +0100
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 32/36] driver core: Introduce device_move(): move a
	device to a new parent.

Hi Greg,

> > > Provide a function device_move() to move a device to a new parent device. Add
> > > auxilliary functions kobject_move() and sysfs_move_dir().
> > > kobject_move() generates a new uevent of type KOBJ_MOVE, containing the
> > > previous path (DEVPATH_OLD) in addition to the usual values. For this, a new
> > > interface kobject_uevent_env() is created that allows to add further
> > > environmental data to the uevent at the kobject layer.
> > 
> > has this one been tested? I don't get it working. I always get an EINVAL
> > when trying to move the TTY device of a Bluetooth RFCOMM link around.
> 
> I relied on Cornelia to test this.  I think some s390 patches depend on
> this change, right?

my pre-condition is that the TTY device has no parent and then we move
it to a Bluetooth ACL link as child. This however is not working or the
TTY change to use device instead of class_device has broken something.

> > 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.

Regards

Marcel


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