+static DEFINE_SPINLOCK(cdev_lock);
+
+static struct kobject *cdev_get(struct cdev *p)
+{
+ struct module *owner = p->owner;
+ struct kobject *kobj;
+
+ if (owner && !try_module_get(owner))
+ return NULL;
+ kobj = kobject_get(&p->kobj);
+ if (!kobj)
+ module_put(owner);
+ return kobj;
+}
+
+void cdev_put(struct cdev *p)
+{
+ if (p) {
+ kobject_put(&p->kobj);
+ module_put(p->owner);
+ }
+}
+