linux-kernel - Re: [patch]hp_accel: Fix race in device removal

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Message-ID: <4BE43B53.9060502@tremplin-utc.net>
Date:	Fri, 07 May 2010 18:09:55 +0200
From:	Éric Piel <eric.piel@...mplin-utc.net>
To:	Oliver Neukum <oneukum@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Pavel Herrmann <morpheus.ibis@...il.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [patch]hp_accel: Fix race in device removal

Op 07-05-10 18:04, Oliver Neukum schreef:
> From 505056649f5ecb1ebb086981243b9870ce961a87 Mon Sep 17 00:00:00 2001
> From: Oliver Neukum <oliver@...kum.org>
> Date: Fri, 7 May 2010 18:02:07 +0200
> Subject: [PATCH] hp_accel: Fix race in device removal
> 
> The work queue has to be flushed after the device has been made
> inaccessible.
> 
> Signed-off-by: Oliver Neukum <oneukum@...e.de>
Ah, flushing the work before unregistering the device seemed more
logical... but now that you mention it, I understand the race.

Thanks

Acked-by: Eric Piel <eric.piel@...mplin-utc.net>


> ---
>  drivers/hwmon/hp_accel.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
> index c8ab505..7580f55 100644
> --- a/drivers/hwmon/hp_accel.c
> +++ b/drivers/hwmon/hp_accel.c
> @@ -328,8 +328,8 @@ static int lis3lv02d_remove(struct acpi_device *device, int type)
>  	lis3lv02d_joystick_disable();
>  	lis3lv02d_poweroff(&lis3_dev);
>  
> -	flush_work(&hpled_led.work);
>  	led_classdev_unregister(&hpled_led.led_classdev);
> +	flush_work(&hpled_led.work);
>  
>  	return lis3lv02d_remove_fs(&lis3_dev);
>  }

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