405 	struct major_info *tap_major;  in tap_get_major()  local
407 	list_for_each_entry_rcu(tap_major, &major_list, next) {  in tap_get_major()
408 		if (tap_major->major == major)  in tap_get_major()
409 			return tap_major;  in tap_get_major()
418 	struct major_info *tap_major;  in tap_get_minor()  local
421 	tap_major = tap_get_major(MAJOR(major));  in tap_get_minor()
422 	if (!tap_major) {  in tap_get_minor()
427 	spin_lock(&tap_major->minor_lock);  in tap_get_minor()
428 	retval = idr_alloc(&tap_major->minor_idr, tap, 1, TAP_NUM_DEVS, GFP_ATOMIC);  in tap_get_minor()
435 	spin_unlock(&tap_major->minor_lock);  in tap_get_minor()
445 	struct major_info *tap_major;  in tap_free_minor()  local
448 	tap_major = tap_get_major(MAJOR(major));  in tap_free_minor()
449 	if (!tap_major) {  in tap_free_minor()
453 	spin_lock(&tap_major->minor_lock);  in tap_free_minor()
455 		idr_remove(&tap_major->minor_idr, tap->minor);  in tap_free_minor()
458 	spin_unlock(&tap_major->minor_lock);  in tap_free_minor()
469 	struct major_info *tap_major;  in dev_get_by_tap_file()  local
472 	tap_major = tap_get_major(major);  in dev_get_by_tap_file()
473 	if (!tap_major) {  in dev_get_by_tap_file()
478 	spin_lock(&tap_major->minor_lock);  in dev_get_by_tap_file()
479 	tap = idr_find(&tap_major->minor_idr, minor);  in dev_get_by_tap_file()
484 	spin_unlock(&tap_major->minor_lock);  in dev_get_by_tap_file()
1339 	struct major_info *tap_major;  in tap_list_add()  local
1341 	tap_major = kzalloc(sizeof(*tap_major), GFP_ATOMIC);  in tap_list_add()
1342 	if (!tap_major)  in tap_list_add()
1345 	tap_major->major = MAJOR(major);  in tap_list_add()
1347 	idr_init(&tap_major->minor_idr);  in tap_list_add()
1348 	spin_lock_init(&tap_major->minor_lock);  in tap_list_add()
1350 	tap_major->device_name = device_name;  in tap_list_add()
1352 	list_add_tail_rcu(&tap_major->next, &major_list);  in tap_list_add()
1356 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,  in tap_create_cdev()  argument
1361 	err = alloc_chrdev_region(tap_major, 0, TAP_NUM_DEVS, device_name);  in tap_create_cdev()
1367 	err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1371 	err =  tap_list_add(*tap_major, device_name);  in tap_create_cdev()
1380 	unregister_chrdev_region(*tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1388 	struct major_info *tap_major, *tmp;  in tap_destroy_cdev()  local
1392 	list_for_each_entry_safe(tap_major, tmp, &major_list, next) {  in tap_destroy_cdev()
1393 		if (tap_major->major == MAJOR(major)) {  in tap_destroy_cdev()
1394 			idr_destroy(&tap_major->minor_idr);  in tap_destroy_cdev()
1395 			list_del_rcu(&tap_major->next);  in tap_destroy_cdev()
1396 			kfree_rcu(tap_major, rcu);  in tap_destroy_cdev()