linux-kernel - Re: [PATCH RFC] [PATCH] drivers/scsi/ch.c: Remove BKL in ch

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Message-ID: <20091011090313.1b8f0eb1@infradead.org>
Date:	Sun, 11 Oct 2009 09:03:13 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	John Kacur <jkacur@...hat.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vincent Sanders <vince@...tec.co.uk>,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH RFC] [PATCH] drivers/scsi/ch.c: Remove BKL in ch_open

On Sun, 11 Oct 2009 16:54:08 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > > I'm not so sure. In fact there are some quite umm interesting
> > > questions about this code, and some of them are shared with other
> > > modules too.
> > > 
> > > Consider the following sequence
> > > 
> > > 		CPU1				CPU2
> > > 	register_chrdev
> > > 		ok
> > > 						open device
> > > 						takes lock
> > 
> > 
> > but open does not take the BKL, so the BKL is not protecting you at
> > all against this..
> 
> But module load/unload does

it does?

looking at the code.... so far failing to find where.



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
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