linux-kernel - Re: [RFC] New kobject/kset/ktype documentation and example code

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Message-ID: <Pine.LNX.4.44L0.0711281432290.5566-100000@iolanthe.rowland.org>
Date:	Wed, 28 Nov 2007 14:36:26 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Kay Sievers <kay.sievers@...y.org>
cc:	Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jonathan Corbet <corbet@....net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>
Subject: Re: [RFC] New kobject/kset/ktype documentation and example code

On Wed, 28 Nov 2007, Kay Sievers wrote:

> > Actually the current code doesn't seem to check whether kobj->ktype is
> > NULL or to use the value of kobj->kset->kobj.ktype.  Is this an oversight?
> 
> We just require the ktype.

No -- we should but we don't.  Look at the code for kobject_init() and
kobject_add() in Greg's tree and you'll see.  Neither of them checks
that kobj->ktype is set.

> > If there is no containing kset, the parent remains NULL.  What happens
> > then?  Does the kobject show up in the sysfs top-level directory?
> 
> "If the kobject belonging to a kset has no parent kobject set, it will
> be added to the kset's directory. Not all members of a kset do
> necessarily live in the kset directory. If an explicit parent kobject is
> assigned before the kobject is added, the kobject is registered with the
> kset, but added below the parent kobject."

Yes, but what if neither kobj->parent nor kobj->kset is set?

Alan Stern

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