kobjects: minor updates

- check if subsystem is NULL during subsys_get().

- Don't increment parent's reference count before we check if we have a 
  valid kobject during kobject_add()

- Do kobject_add() in subsys_register(), instead of kobject_register(), 
  since we've already done kobject_init(). 

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 6b528c5a61cb..821d17e15a01 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -52,7 +52,7 @@ extern void subsystem_unregister(struct subsystem *);
 
 static inline struct subsystem * subsys_get(struct subsystem * s)
 {
-	return container_of(kobject_get(&s->kobj),struct subsystem,kobj);
+	return s ? container_of(kobject_get(&s->kobj),struct subsystem,kobj) : NULL;
 }
 
 static inline void subsys_put(struct subsystem * s)