linux-kernel - [PATCH 06/13] LEDS: fix race in device

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Date:	Tue, 20 May 2008 15:34:53 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	Richard Purdie <rpurdie@...ys.net>
Subject: [PATCH 06/13] LEDS: fix race in device_create

There is a race from when a device is created with device_create() and
then the drvdata is set with a call to dev_set_drvdata() in which a
sysfs file could be open, yet the drvdata will be NULL, causing all
sorts of bad things to happen.

This patch fixes the problem by using the new function,
device_create_drvdata().

Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Richard Purdie <rpurdie@...ys.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/leds/led-class.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index b3c54be..559a408 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -103,13 +103,11 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 {
 	int rc;
 
-	led_cdev->dev = device_create(leds_class, parent, 0, "%s",
-					    led_cdev->name);
+	led_cdev->dev = device_create_drvdata(leds_class, parent, 0, led_cdev,
+					      "%s", led_cdev->name);
 	if (IS_ERR(led_cdev->dev))
 		return PTR_ERR(led_cdev->dev);
 
-	dev_set_drvdata(led_cdev->dev, led_cdev);
-
 	/* register the attributes */
 	rc = device_create_file(led_cdev->dev, &dev_attr_brightness);
 	if (rc)
-- 
1.5.5.1

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