Fix failure exits in asus-laptop

Fallout from f8a7c6fe14f556ca8eeddce258cb21392d0c3a2f.  However, looking
at it shows that checks done in ASUS_LED_UNREGISTER() can't trigger
at all (we never get to asus_led_exit() if registration fails) and
if that registration fails, we actually leak stuff.  IOW, it's worse
than just replacing class_dev with dev in there - the tests themselves
had been papering over the lousy cleanup logics.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Karol Kozimor <sziwan@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 21 insertions, 11 deletions

diff --git a/drivers/misc/asus-laptop.c b/drivers/misc/asus-laptop.c
index f75306059971..6b89854bd3ff 100644
--- a/drivers/misc/asus-laptop.c
+++ b/drivers/misc/asus-laptop.c
@@ -1067,19 +1067,16 @@ static void asus_backlight_exit(void)
 }
 
 #define  ASUS_LED_UNREGISTER(object)                            \
-        if(object##_led.class_dev                               \
-           && !IS_ERR(object##_led.class_dev))                  \
-                led_classdev_unregister(&object##_led)
+        led_classdev_unregister(&object##_led)
 
 static void asus_led_exit(void)
 {
+        destroy_workqueue(led_workqueue);
         ASUS_LED_UNREGISTER(mled);
         ASUS_LED_UNREGISTER(tled);
         ASUS_LED_UNREGISTER(pled);
         ASUS_LED_UNREGISTER(rled);
         ASUS_LED_UNREGISTER(gled);
-
-        destroy_workqueue(led_workqueue);
 }
 
 static void __exit asus_laptop_exit(void)
@@ -1135,29 +1132,42 @@ static int asus_led_init(struct device *dev)
 
         rv = ASUS_LED_REGISTER(mled, dev);
         if (rv)
-                return rv;
+                goto out;
 
         rv = ASUS_LED_REGISTER(tled, dev);
         if (rv)
-                return rv;
+                goto out1;
 
         rv = ASUS_LED_REGISTER(rled, dev);
         if (rv)
-                return rv;
+                goto out2;
 
         rv = ASUS_LED_REGISTER(pled, dev);
         if (rv)
-                return rv;
+                goto out3;
 
         rv = ASUS_LED_REGISTER(gled, dev);
         if (rv)
-                return rv;
+                goto out4;
 
         led_workqueue = create_singlethread_workqueue("led_workqueue");
         if (!led_workqueue)
-                return -ENOMEM;
+                goto out5;
 
         return 0;
+out5:
+        rv = -ENOMEM;
+        ASUS_LED_UNREGISTER(gled);
+out4:
+        ASUS_LED_UNREGISTER(pled);
+out3:
+        ASUS_LED_UNREGISTER(rled);
+out2:
+        ASUS_LED_UNREGISTER(tled);
+out1:
+        ASUS_LED_UNREGISTER(mled);
+out:
+        return rv;
 }
 
 static int __init asus_laptop_init(void)