Date: Thu, 16 Mar 2006 08:47:12 -0800
From: Greg KH <greg@kroah.com>
To: "Artem B. Bityutskiy" <dedekind@infradead.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Bug? Report] kref problem
Message-ID: <20060316164712.GA10167@kroah.com>
References: <1142509279.3920.31.camel@sauron.oktetlabs.ru>
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On Thu, Mar 16, 2006 at 02:41:19PM +0300, Artem B. Bityutskiy wrote:
> Hello Greg,
> 
> I've hit on a kref problem Please, glance at the attached test module.
> 
> The idea of the test is to create 2 kobjects (a and b), create dir A
> with kobject A, and dir B with kobject B, so that A is B's parent. E.g.,
> we'll have /sys/A/B.
> 
> I see the following output of the test:
> 
> a inited, kref 1
> b inited, kref 1
> dir A created, A kref 1, B kref 1
> dir B created, A kref 1, B kref 1
> b_release
> a_release
> kobj B put, A kref 0, B kref 0
> kobj A put, A kref -1, B kref 0
> 
> 
> So what I don't like is this "A kref -1". Why when I remove directory B,
> kobj a is released? For me it looks like a bug.

Sample code please?

Also, creating sysfs directories does not change the reference count on
kobjects, they are two separate things.

thanks,

greg k-h
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