linux-kernel - Re: [Patch -mm 1/1] driver core: Introduce device

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Message-Id: <1164032103.5541.12.camel@min.off.vrfy.org>
Date:	Mon, 20 Nov 2006 15:15:03 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [Patch -mm 1/1] driver core: Introduce device_move(): move a
	device to a new parent.

On Mon, 2006-11-20 at 13:55 +0100, Cornelia Huck wrote: 
> From: Cornelia Huck <cornelia.huck@...ibm.com>
> 
> 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.

> +void kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
> +			int num_envp, char *envp[])

We usually use a NULL terminated array for things like this. Does
passing the number of entries give us an advantage?

> +{
> +	/* Disallow dumb users. */
> +	if (num_envp > NUM_EXT_ENVP)
> +		return;

Why do we need such a limit? There are still thousand other ways to
screw things up. :)

And kobject_uevent() can just call kobject_uevent_env(), there is no
need for the indirection with do_*, right?

Thanks,
Kay

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