linux-kernel - Re: [RFC] Sample kset/ktype/kobject implementation

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Message-ID: <20071130064113.GB14596@kroah.com>
Date:	Thu, 29 Nov 2007 22:41:13 -0800
From:	Greg KH <greg@...ah.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jonathan Corbet <corbet@....net>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: Re: [RFC] Sample kset/ktype/kobject implementation

On Thu, Nov 29, 2007 at 05:11:35PM -0500, Alan Stern wrote:
> On Thu, 29 Nov 2007, Greg KH wrote:
> 
> > > > > kobject_put(foo) is needed since it gets you through kobject_cleanup()
> > > > > where the name can be freed.
> > > > 
> > > > No, kobject_register() should have handled that for us, right?
> > > 
> > > kobject_register() doesn't do a kobject_put() if kobject_add() failed.
> > 
> > Crap.  If I can't get this code right in an example, the API is messed
> > up.  Time to take Kay seriously and start to revamp the basic kobject
> > api :)
> 
> The rule is simple enough.  After calling kobject_register() you should 
> always use kobject_put() -- even if kobject_register() failed.

Yes.

> In fact, after calling kobject_init() you should use kobject_put().  
> The first rule follows from this one, since kobject_register() calls 
> kobject_init() internally.

Yes, that makes sense, time to write it all down :)

thanks,

greg k-h
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