linux-kernel - Re: [PATCH] kobject: introduce kobj

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Message-ID: <5230B7D4.5020405@suse.com>
Date:	Wed, 11 Sep 2013 14:35:00 -0400
From:	Jeff Mahoney <jeffm@...e.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Greg KH <gregkh@...ux.com>,
	Linux Kernel Maling List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kobject: introduce kobj_completion

On 9/11/13 1:28 PM, Al Viro wrote:
> On Wed, Sep 11, 2013 at 01:00:30PM -0400, Jeff Mahoney wrote:
>> A common way to handle kobject lifetimes in embedded in objects with
>> different lifetime rules is to pair the kobject with a struct completion.
>>
>> This introduces a kobj_completion structure that can be used in place
>> of the pairing, along with several convenience functions for
>> initialization, release, and put-and-wait.
> 
> That's very easy to misuse, leading to deadlocks...

Misuse how? If you're using it any time other than shutting down an
object, you're shooting yourself in the foot.

-Jeff

-- 
Jeff Mahoney
SUSE Labs


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