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

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Message-ID: <Pine.LNX.4.44L0.0711300949070.3833-100000@iolanthe.rowland.org>
Date:	Fri, 30 Nov 2007 09:51:27 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Dave Young <hidave.darkstar@...il.com>
cc:	Greg KH <greg@...ah.com>, 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 Fri, 30 Nov 2007, Dave Young wrote:

> > The rule is simple enough.  After calling kobject_register() you should
> > always use kobject_put() -- even if kobject_register() failed.
> >
> > 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.
> >
> Hi,
> The behavior is not very clear here, the root problem is that :
> 
> 1. Should we call kobject_put so cleanup work can be done by refcount
> touch zero or call kfree every time after kobject_register failed?

Call kobject_put so that the cleanup work will be done when the 
refcount goes to 0.  Don't call kfree.

> 2. If kobject_put calling is true, should this be done in
> kobject_register error handling codes or by hand after
> kobject_register failed?

It should be done by hand after kobject_register fails.  Otherwise 
kobject_register would end up dropping a reference that it never 
acquired.

Alan Stern

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