393 	struct major_info *tap_major;  in tap_get_major()  local
395 	list_for_each_entry_rcu(tap_major, &major_list, next) {  in tap_get_major()
396 		if (tap_major->major == major)  in tap_get_major()
397 			return tap_major;  in tap_get_major()
406 	struct major_info *tap_major;  in tap_get_minor()  local
409 	tap_major = tap_get_major(MAJOR(major));  in tap_get_minor()
410 	if (!tap_major) {  in tap_get_minor()
415 	spin_lock(&tap_major->minor_lock);  in tap_get_minor()
416 	retval = idr_alloc(&tap_major->minor_idr, tap, 1, TAP_NUM_DEVS, GFP_ATOMIC);  in tap_get_minor()
423 	spin_unlock(&tap_major->minor_lock);  in tap_get_minor()
433 	struct major_info *tap_major;  in tap_free_minor()  local
436 	tap_major = tap_get_major(MAJOR(major));  in tap_free_minor()
437 	if (!tap_major) {  in tap_free_minor()
441 	spin_lock(&tap_major->minor_lock);  in tap_free_minor()
443 		idr_remove(&tap_major->minor_idr, tap->minor);  in tap_free_minor()
446 	spin_unlock(&tap_major->minor_lock);  in tap_free_minor()
457 	struct major_info *tap_major;  in dev_get_by_tap_file()  local
460 	tap_major = tap_get_major(major);  in dev_get_by_tap_file()
461 	if (!tap_major) {  in dev_get_by_tap_file()
466 	spin_lock(&tap_major->minor_lock);  in dev_get_by_tap_file()
467 	tap = idr_find(&tap_major->minor_idr, minor);  in dev_get_by_tap_file()
472 	spin_unlock(&tap_major->minor_lock);  in dev_get_by_tap_file()
1305 	struct major_info *tap_major;  in tap_list_add()  local
1307 	tap_major = kzalloc(sizeof(*tap_major), GFP_ATOMIC);  in tap_list_add()
1308 	if (!tap_major)  in tap_list_add()
1311 	tap_major->major = MAJOR(major);  in tap_list_add()
1313 	idr_init(&tap_major->minor_idr);  in tap_list_add()
1314 	spin_lock_init(&tap_major->minor_lock);  in tap_list_add()
1316 	tap_major->device_name = device_name;  in tap_list_add()
1318 	list_add_tail_rcu(&tap_major->next, &major_list);  in tap_list_add()
1322 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,  in tap_create_cdev()  argument
1327 	err = alloc_chrdev_region(tap_major, 0, TAP_NUM_DEVS, device_name);  in tap_create_cdev()
1333 	err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1337 	err =  tap_list_add(*tap_major, device_name);  in tap_create_cdev()
1346 	unregister_chrdev_region(*tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1354 	struct major_info *tap_major, *tmp;  in tap_destroy_cdev()  local
1358 	list_for_each_entry_safe(tap_major, tmp, &major_list, next) {  in tap_destroy_cdev()
1359 		if (tap_major->major == MAJOR(major)) {  in tap_destroy_cdev()
1360 			idr_destroy(&tap_major->minor_idr);  in tap_destroy_cdev()
1361 			list_del_rcu(&tap_major->next);  in tap_destroy_cdev()
1362 			kfree_rcu(tap_major, rcu);  in tap_destroy_cdev()