linux-kernel - [PATCH v2] hwmon: (gpio-fan) Fix fan_ctrl

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Date:	Tue, 09 Nov 2010 16:41:48 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	Simon Guinot <sguinot@...ie.com>, lm-sensors@...sensors.org
Subject: [PATCH v2] hwmon: (gpio-fan) Fix fan_ctrl_init error path

In current implementation, the sysfs entries is not removed before return -ENODEV.

Creating the sysfs attribute should be the last thing done by the function,
after all the rest has been successful.
Otherwise there is a small window during which user-space can access the attribute
but the driver isn't ready to deal with the requests.

Fix it by moving sysfs_create_group to be the last thing done by the function.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/hwmon/gpio-fan.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index aa701a1..f141a1d 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -376,10 +376,6 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data,
 		}
 	}
 
-	err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
-	if (err)
-		goto err_free_gpio;
-
 	fan_data->num_ctrl = num_ctrl;
 	fan_data->ctrl = ctrl;
 	fan_data->num_speed = pdata->num_speed;
@@ -391,6 +387,10 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data,
 		goto err_free_gpio;
 	}
 
+	err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
+	if (err)
+		goto err_free_gpio;
+
 	return 0;
 
 err_free_gpio:
-- 
1.7.2



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