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@gmail.com>
Acked-by: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index aa701a18370793a080a40be5e865465e83820159..f141a1de519cb2af822deef686229734c6d94249 100644 (file)
--- 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: