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

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Message-Id: <200910211516.20614.arnd@arndb.de>
Date:	Wed, 21 Oct 2009 15:16:20 +0200
From:	Arnd Bergmann <arndbergmann@...glemail.com>
To:	John Kacur <jkacur@...hat.com>
Cc:	Arnd Bergmann <arndbergmann@...glemail.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 Wednesday 21 October 2009, John Kacur wrote:
> From 96872f13a510db69fbb32f9e956615cd826f8986 Mon Sep 17 00:00:00 2001
> From: John Kacur <jkacur@...hat.com>
> Date: Sun, 18 Oct 2009 23:49:49 +0200
> Subject: [PATCH] sony_pi: Remove the BKL from open and ioctl
> 
> The BKL is in this function because of the BKL pushdown
> (see commit f8f2c79d594463427f7114cedb1555110d547d89)
> 
> It is not needed here because the mutex_lock sonypi_device.lock
> provides the necessary locking.
> 
> sonpi_misc_ioctl can be converted to unlocked ioctls since it relies on
> its own locking (the mutex sonypi_device.lock) and not the bkl
> 
> Document that llseek is not needed by explictly setting it to no_llseek
> 
> Signed-off-by: John Kacur <jkacur@...hat.com>

Acked-by: Arnd Bergmann <arnd@...db.de>

This looks perfect to me now. Just a few hundred more of these,
and we're done with the drivers ;-)
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