32 	return mdev->parent->dev;  in mdev_parent_dev()
69 	struct mdev_parent *parent;  in __find_parent_device()  local
71 	list_for_each_entry(parent, &parent_list, next) {  in __find_parent_device()
72 		if (parent->dev == dev)  in __find_parent_device()
73 			return parent;  in __find_parent_device()
80 	struct mdev_parent *parent = container_of(kref, struct mdev_parent,  in mdev_release_parent()  local
82 	struct device *dev = parent->dev;  in mdev_release_parent()
84 	kfree(parent);  in mdev_release_parent()
88 static struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)  in mdev_get_parent()  argument
90 	if (parent)  in mdev_get_parent()
91 		kref_get(&parent->ref);  in mdev_get_parent()
93 	return parent;  in mdev_get_parent()
96 static void mdev_put_parent(struct mdev_parent *parent)  in mdev_put_parent()  argument
98 	if (parent)  in mdev_put_parent()
99 		kref_put(&parent->ref, mdev_release_parent);  in mdev_put_parent()
102 /* Caller must hold parent unreg_sem read or write lock */
105 	struct mdev_parent *parent;  in mdev_device_remove_common()  local
112 	parent = mdev->parent;  in mdev_device_remove_common()
113 	lockdep_assert_held(&parent->unreg_sem);  in mdev_device_remove_common()
114 	ret = parent->ops->remove(mdev);  in mdev_device_remove_common()
120 	mdev_put_parent(parent);  in mdev_device_remove_common()
136  * @dev: device structure representing parent device.
137  * @ops: Parent device operation structure to be registered.
139  * Add device to list of registered parent devices.
145 	struct mdev_parent *parent;  in mdev_register_device()  local
160 	parent = __find_parent_device(dev);  in mdev_register_device()
161 	if (parent) {  in mdev_register_device()
162 		parent = NULL;  in mdev_register_device()
167 	parent = kzalloc(sizeof(*parent), GFP_KERNEL);  in mdev_register_device()
168 	if (!parent) {  in mdev_register_device()
173 	kref_init(&parent->ref);  in mdev_register_device()
174 	init_rwsem(&parent->unreg_sem);  in mdev_register_device()
176 	parent->dev = dev;  in mdev_register_device()
177 	parent->ops = ops;  in mdev_register_device()
187 	ret = parent_create_sysfs_files(parent);  in mdev_register_device()
195 	list_add(&parent->next, &parent_list);  in mdev_register_device()
205 	if (parent)  in mdev_register_device()
206 		mdev_put_parent(parent);  in mdev_register_device()
214  * mdev_unregister_device : Unregister a parent device
215  * @dev: device structure representing parent device.
217  * Remove device from list of registered parent devices. Give a chance to free
223 	struct mdev_parent *parent;  in mdev_unregister_device()  local
228 	parent = __find_parent_device(dev);  in mdev_unregister_device()
230 	if (!parent) {  in mdev_unregister_device()
236 	list_del(&parent->next);  in mdev_unregister_device()
239 	down_write(&parent->unreg_sem);  in mdev_unregister_device()
245 	parent_remove_sysfs_files(parent);  in mdev_unregister_device()
246 	up_write(&parent->unreg_sem);  in mdev_unregister_device()
248 	mdev_put_parent(parent);  in mdev_unregister_device()
277 	struct mdev_parent *parent;  in mdev_device_create()  local
280 	parent = mdev_get_parent(type->parent);  in mdev_device_create()
281 	if (!parent)  in mdev_device_create()
306 	mdev->parent = parent;  in mdev_device_create()
308 	/* Check if parent unregistration has started */  in mdev_device_create()
309 	if (!down_read_trylock(&parent->unreg_sem)) {  in mdev_device_create()
316 	mdev->dev.parent  = dev;  in mdev_device_create()
320 	mdev->dev.groups = parent->ops->mdev_attr_groups;  in mdev_device_create()
323 	ret = parent->ops->create(kobj, mdev);  in mdev_device_create()
337 	up_read(&parent->unreg_sem);  in mdev_device_create()
344 	parent->ops->remove(mdev);  in mdev_device_create()
346 	up_read(&parent->unreg_sem);  in mdev_device_create()
349 	mdev_put_parent(parent);  in mdev_device_create()
356 	struct mdev_parent *parent;  in mdev_device_remove()  local
379 	parent = mdev->parent;  in mdev_device_remove()
380 	/* Check if parent unregistration has started */  in mdev_device_remove()
381 	if (!down_read_trylock(&parent->unreg_sem))  in mdev_device_remove()
385 	up_read(&parent->unreg_sem);  in mdev_device_remove()