linux-kernel - Re: refcounting drivers' data structures used in sysfs buffers

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Message-ID: <Pine.LNX.4.44L0.0703121643001.3688-100000@iolanthe.rowland.org>
Date:	Mon, 12 Mar 2007 16:45:04 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:	Oliver Neukum <oneukum@...e.de>, Maneesh Soni <maneesh@...ibm.com>,
	<gregkh@...e.de>, <linux-kernel@...r.kernel.org>
Subject: Re: refcounting drivers' data structures used in sysfs buffers

On Mon, 12 Mar 2007, Dmitry Torokhov wrote:

> > Do you think Linus would listen if all three of us (plus maybe Greg) tried
> > to convince him?
> >
> 
> If we'd accompany the argument with the patch that changes scsi to use
> wq to perform deletion so we don't have deadlock regression in the
> kernel he might be more perceptive...

I wrote that patch over the weekend but forgot to bring it in to work.  
I'll post it tonight or tomorrow.

>  He is right about lifetime
> issues but this is not strictly lifetime issue as you correctly point
> out. Plus, refcounting also bloats the kernel so I don't relly want to
> use refcount for every integer I happen to export through sysfs if I
> can simply "revoke" access.

Agreed.

Alan Stern

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