62 	struct drm_dp_aux_dev *aux_dev = NULL;  in drm_dp_aux_dev_get_by_minor()  local
65 	aux_dev = idr_find(&aux_idr, index);  in drm_dp_aux_dev_get_by_minor()
66 	if (aux_dev && !kref_get_unless_zero(&aux_dev->refcount))  in drm_dp_aux_dev_get_by_minor()
67 		aux_dev = NULL;  in drm_dp_aux_dev_get_by_minor()
70 	return aux_dev;  in drm_dp_aux_dev_get_by_minor()
75 	struct drm_dp_aux_dev *aux_dev;  in alloc_drm_dp_aux_dev()  local
78 	aux_dev = kzalloc(sizeof(*aux_dev), GFP_KERNEL);  in alloc_drm_dp_aux_dev()
79 	if (!aux_dev)  in alloc_drm_dp_aux_dev()
81 	aux_dev->aux = aux;  in alloc_drm_dp_aux_dev()
82 	atomic_set(&aux_dev->usecount, 1);  in alloc_drm_dp_aux_dev()
83 	kref_init(&aux_dev->refcount);  in alloc_drm_dp_aux_dev()
86 	index = idr_alloc(&aux_idr, aux_dev, 0, DRM_AUX_MINORS, GFP_KERNEL);  in alloc_drm_dp_aux_dev()
89 		kfree(aux_dev);  in alloc_drm_dp_aux_dev()
92 	aux_dev->index = index;  in alloc_drm_dp_aux_dev()
94 	return aux_dev;  in alloc_drm_dp_aux_dev()
99 	struct drm_dp_aux_dev *aux_dev =  in release_drm_dp_aux_dev()  local
102 	kfree(aux_dev);  in release_drm_dp_aux_dev()
109 	struct drm_dp_aux_dev *aux_dev =  in name_show()  local
112 	if (!aux_dev)  in name_show()
115 	res = sprintf(buf, "%s\n", aux_dev->aux->name);  in name_show()
116 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);  in name_show()
131 	struct drm_dp_aux_dev *aux_dev;  in auxdev_open()  local
133 	aux_dev = drm_dp_aux_dev_get_by_minor(minor);  in auxdev_open()
134 	if (!aux_dev)  in auxdev_open()
137 	file->private_data = aux_dev;  in auxdev_open()
148 	struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;  in auxdev_read_iter()  local
152 	if (!atomic_inc_not_zero(&aux_dev->usecount))  in auxdev_read_iter()
166 		res = drm_dp_dpcd_read(aux_dev->aux, pos, buf, todo);  in auxdev_read_iter()
183 	if (atomic_dec_and_test(&aux_dev->usecount))  in auxdev_read_iter()
184 		wake_up_var(&aux_dev->usecount);  in auxdev_read_iter()
191 	struct drm_dp_aux_dev *aux_dev = iocb->ki_filp->private_data;  in auxdev_write_iter()  local
195 	if (!atomic_inc_not_zero(&aux_dev->usecount))  in auxdev_write_iter()
214 		res = drm_dp_dpcd_write(aux_dev->aux, pos, buf, todo);  in auxdev_write_iter()
226 	if (atomic_dec_and_test(&aux_dev->usecount))  in auxdev_write_iter()
227 		wake_up_var(&aux_dev->usecount);  in auxdev_write_iter()
234 	struct drm_dp_aux_dev *aux_dev = file->private_data;  in auxdev_release()  local
236 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);  in auxdev_release()
253 	struct drm_dp_aux_dev *iter, *aux_dev = NULL;  in drm_dp_aux_dev_get_by_aux()  local
264 			aux_dev = iter;  in drm_dp_aux_dev_get_by_aux()
269 	return aux_dev;  in drm_dp_aux_dev_get_by_aux()
274 	struct drm_dp_aux_dev *aux_dev;  in drm_dp_aux_unregister_devnode()  local
277 	aux_dev = drm_dp_aux_dev_get_by_aux(aux);  in drm_dp_aux_unregister_devnode()
278 	if (!aux_dev) /* attach must have failed */  in drm_dp_aux_unregister_devnode()
288 	idr_remove(&aux_idr, aux_dev->index);  in drm_dp_aux_unregister_devnode()
291 	atomic_dec(&aux_dev->usecount);  in drm_dp_aux_unregister_devnode()
292 	wait_var_event(&aux_dev->usecount, !atomic_read(&aux_dev->usecount));  in drm_dp_aux_unregister_devnode()
294 	minor = aux_dev->index;  in drm_dp_aux_unregister_devnode()
295 	if (aux_dev->dev)  in drm_dp_aux_unregister_devnode()
300 	kref_put(&aux_dev->refcount, release_drm_dp_aux_dev);  in drm_dp_aux_unregister_devnode()
305 	struct drm_dp_aux_dev *aux_dev;  in drm_dp_aux_register_devnode()  local
308 	aux_dev = alloc_drm_dp_aux_dev(aux);  in drm_dp_aux_register_devnode()
309 	if (IS_ERR(aux_dev))  in drm_dp_aux_register_devnode()
310 		return PTR_ERR(aux_dev);  in drm_dp_aux_register_devnode()
312 	aux_dev->dev = device_create(drm_dp_aux_dev_class, aux->dev,  in drm_dp_aux_register_devnode()
313 				     MKDEV(drm_dev_major, aux_dev->index), NULL,  in drm_dp_aux_register_devnode()
314 				     "drm_dp_aux%d", aux_dev->index);  in drm_dp_aux_register_devnode()
315 	if (IS_ERR(aux_dev->dev)) {  in drm_dp_aux_register_devnode()
316 		res = PTR_ERR(aux_dev->dev);  in drm_dp_aux_register_devnode()
317 		aux_dev->dev = NULL;  in drm_dp_aux_register_devnode()
322 		  aux->name, aux_dev->index);  in drm_dp_aux_register_devnode()