linux-kernel - [02/34] hp_accel: fix race in device removal

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Message-Id: <20100524230349.528175041@clark.site>
Date:	Mon, 24 May 2010 15:59:34 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Oliver Neukum <oneukum@...e.de>,
	Eric Piel <eric.piel@...mplin-utc.net>,
	Pavel Machek <pavel@....cz>,
	Pavel Herrmann <morpheus.ibis@...il.com>
Subject: [02/34] hp_accel: fix race in device removal

2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Oliver Neukum <oneukum@...e.de>

commit 06efbeb4a47b6f865e1c9d175ab9d6e90b69ae9e upstream.

The work queue has to be flushed after the device has been made
inaccessible.  The patch closes a window during which a work queue might
remain active after the device is removed and would then lead to ACPI
calls with undefined behavior.

Signed-off-by: Oliver Neukum <oneukum@...e.de>
Acked-by: Eric Piel <eric.piel@...mplin-utc.net>
Acked-by: Pavel Machek <pavel@....cz>
Cc: Pavel Herrmann <morpheus.ibis@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hwmon/hp_accel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/hp_accel.c
+++ b/drivers/hwmon/hp_accel.c
@@ -324,8 +324,8 @@ static int lis3lv02d_remove(struct acpi_
 	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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