linux-kernel - Re: [PATCH] sony_pi: Remove the BKL from sonypi_misc

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Message-ID: <20091022025224.GA17438@infradead.org>
Date:	Wed, 21 Oct 2009 22:52:24 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Arnd Bergmann <arndbergmann@...glemail.com>
Cc:	John Kacur <jkacur@...hat.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mattia Dongili <malattia@...ux.it>
Subject: Re: [PATCH] sony_pi: Remove the BKL from sonypi_misc_open

On Wed, Oct 21, 2009 at 10:29:21AM +0200, Arnd Bergmann wrote:
> Well, for this specific case, the driver does not actually need to seek,
> because the read function never looks at the position and there is no
> write function. For annotation purposes, IMHO we should have a simple
> '.llseek = no_llseek' in there.

Which is normal for character drivers.  Even better you should use
nonseekable_open to also prevent pread/pwrite.

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