hwmon: (applesmc) Correct sysfs fan error handling

The current code will not remove the sysfs files for fan numbers three
and up. Also, upon exit, fans one and two are removed regardless of
their existence.  This patch cleans up the sysfs error handling for
the fans.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 0f28d91f29d8ef81c50b036bad0c84ca78e76bd8..f085c18d2905a602d465ef01a8d08b2a29467c28 100644 (file)
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -195,6 +195,9 @@ static unsigned int applesmc_accelerometer;
 /* Indicates whether this computer has light sensors and keyboard backlight. */
 static unsigned int applesmc_light;
 
+/* The number of fans handled by the driver */
+static unsigned int fans_handled;
+
 /* Indicates which temperature sensors set to use. */
 static unsigned int applesmc_temperature_set;
 
@@ -1492,39 +1495,24 @@ static int __init applesmc_init(void)
 
        /* create fan files */
        count = applesmc_get_fan_count();
-       if (count < 0) {
+       if (count < 0)
                printk(KERN_ERR "applesmc: Cannot get the number of fans.\n");
-       } else {
+       else
                printk(KERN_INFO "applesmc: %d fans found.\n", count);
 
-               switch (count) {
-               default:
-                       printk(KERN_WARNING "applesmc: More than 4 fans found,"
-                                       " but at most 4 fans are supported"
-                                               " by the driver.\n");
-               case 4:
-                       ret = sysfs_create_group(&pdev->dev.kobj,
-                                                &fan_attribute_groups[3]);
-                       if (ret)
-                               goto out_key_enumeration;
-               case 3:
-                       ret = sysfs_create_group(&pdev->dev.kobj,
-                                                &fan_attribute_groups[2]);
-                       if (ret)
-                               goto out_key_enumeration;
-               case 2:
-                       ret = sysfs_create_group(&pdev->dev.kobj,
-                                                &fan_attribute_groups[1]);
-                       if (ret)
-                               goto out_key_enumeration;
-               case 1:
-                       ret = sysfs_create_group(&pdev->dev.kobj,
-                                                &fan_attribute_groups[0]);
-                       if (ret)
-                               goto out_fan_1;
-               case 0:
-                       ;
-               }
+       if (count > 4) {
+               count = 4;
+               printk(KERN_WARNING "applesmc: More than 4 fans found,"
+                      " but at most 4 fans are supported"
+                      " by the driver.\n");
+       }
+
+       while (fans_handled < count) {
+               ret = sysfs_create_group(&pdev->dev.kobj,
+                                        &fan_attribute_groups[fans_handled]);
+               if (ret)
+                       goto out_fans;
+               fans_handled++;
        }
 
        for (i = 0;
@@ -1593,10 +1581,10 @@ out_accelerometer:
                applesmc_release_accelerometer();
 out_temperature:
        sysfs_remove_group(&pdev->dev.kobj, &temperature_attributes_group);
-       sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[0]);
-out_fan_1:
-       sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[1]);
-out_key_enumeration:
+out_fans:
+       while (fans_handled)
+               sysfs_remove_group(&pdev->dev.kobj,
+                                  &fan_attribute_groups[--fans_handled]);
        sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
 out_name:
        sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
@@ -1622,8 +1610,9 @@ static void __exit applesmc_exit(void)
        if (applesmc_accelerometer)
                applesmc_release_accelerometer();
        sysfs_remove_group(&pdev->dev.kobj, &temperature_attributes_group);
-       sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[0]);
-       sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[1]);
+       while (fans_handled)
+               sysfs_remove_group(&pdev->dev.kobj,
+                                  &fan_attribute_groups[--fans_handled]);
        sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
        sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
        platform_device_unregister(pdev);