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

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Message-ID: <20071128170654.GA29466@kroah.com>
Date:	Wed, 28 Nov 2007 09:06:54 -0800
From:	Greg KH <greg@...ah.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Kay Sievers <kay.sievers@...y.org>, linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Jonathan Corbet <corbet@....net>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: Re: [RFC] New kobject/kset/ktype documentation and example code

On Wed, Nov 28, 2007 at 05:09:50PM +0100, Cornelia Huck wrote:
> On Wed, 28 Nov 2007 17:03:07 +0100,
> Kay Sievers <kay.sievers@...y.org> wrote:
> 
> > On Wed, 2007-11-28 at 16:52 +0100, Cornelia Huck wrote:
> > > On Wed, 28 Nov 2007 13:35:54 +0100,
> > > Kay Sievers <kay.sievers@...y.org> wrote:
> > > 
> > > > On Wed, 2007-11-28 at 10:01 +0100, Cornelia Huck wrote:
> > > > > On Tue, 27 Nov 2007 15:02:52 -0800, Greg KH <greg@...ah.com> wrote:
> > > > 
> > > > > > Among other things, kobject_init() sets the kobject's reference count to
> > > > > > one.  Calling kobject_init() is not sufficient, however. Kobject users
> > > > > > must, at a minimum, set the name of the kobject; this is the name that will
> > > > > > be used in sysfs entries. 
> > > > > 
> > > > > Unless they don't register their kobject. (But they should always set a
> > > > > name anyway to avoid funny debug messages, so it is probably a good
> > > > > idea to call this a "must").
> > > > 
> > > > Yeah, we should require it. And kobject_cleanup() needs to be called to
> > > > free the allocated name, if the object is not already added and needs to
> > > > be deleted (common in rewinding on error).
> > > 
> > > Always using kobject_put() should take care of that.
> > 
> > Ok, so we can always require a kobject_put() after a kobject_init(), to
> > cleanup what happened after _init() and before _add()?
> 
> That's a sensible requirement, I think.

Yes, there are a few usages of unregistered kobjects in the kernel
today, but I think that was people just not realizing they could use a
simple kref instead.  I'm working on cleaning them up right now...

thanks,

greg k-h
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