394 	struct major_info *tap_major;  in tap_get_major()  local
396 	list_for_each_entry_rcu(tap_major, &major_list, next) {  in tap_get_major()
397 		if (tap_major->major == major)  in tap_get_major()
398 			return tap_major;  in tap_get_major()
407 	struct major_info *tap_major;  in tap_get_minor()  local
410 	tap_major = tap_get_major(MAJOR(major));  in tap_get_minor()
411 	if (!tap_major) {  in tap_get_minor()
416 	spin_lock(&tap_major->minor_lock);  in tap_get_minor()
417 	retval = idr_alloc(&tap_major->minor_idr, tap, 1, TAP_NUM_DEVS, GFP_ATOMIC);  in tap_get_minor()
424 	spin_unlock(&tap_major->minor_lock);  in tap_get_minor()
434 	struct major_info *tap_major;  in tap_free_minor()  local
437 	tap_major = tap_get_major(MAJOR(major));  in tap_free_minor()
438 	if (!tap_major) {  in tap_free_minor()
442 	spin_lock(&tap_major->minor_lock);  in tap_free_minor()
444 		idr_remove(&tap_major->minor_idr, tap->minor);  in tap_free_minor()
447 	spin_unlock(&tap_major->minor_lock);  in tap_free_minor()
458 	struct major_info *tap_major;  in dev_get_by_tap_file()  local
461 	tap_major = tap_get_major(major);  in dev_get_by_tap_file()
462 	if (!tap_major) {  in dev_get_by_tap_file()
467 	spin_lock(&tap_major->minor_lock);  in dev_get_by_tap_file()
468 	tap = idr_find(&tap_major->minor_idr, minor);  in dev_get_by_tap_file()
473 	spin_unlock(&tap_major->minor_lock);  in dev_get_by_tap_file()
1244 	struct major_info *tap_major;  in tap_list_add()  local
1246 	tap_major = kzalloc(sizeof(*tap_major), GFP_ATOMIC);  in tap_list_add()
1247 	if (!tap_major)  in tap_list_add()
1250 	tap_major->major = MAJOR(major);  in tap_list_add()
1252 	idr_init(&tap_major->minor_idr);  in tap_list_add()
1253 	spin_lock_init(&tap_major->minor_lock);  in tap_list_add()
1255 	tap_major->device_name = device_name;  in tap_list_add()
1257 	list_add_tail_rcu(&tap_major->next, &major_list);  in tap_list_add()
1261 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,  in tap_create_cdev()  argument
1266 	err = alloc_chrdev_region(tap_major, 0, TAP_NUM_DEVS, device_name);  in tap_create_cdev()
1272 	err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1276 	err =  tap_list_add(*tap_major, device_name);  in tap_create_cdev()
1285 	unregister_chrdev_region(*tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1293 	struct major_info *tap_major, *tmp;  in tap_destroy_cdev()  local
1297 	list_for_each_entry_safe(tap_major, tmp, &major_list, next) {  in tap_destroy_cdev()
1298 		if (tap_major->major == MAJOR(major)) {  in tap_destroy_cdev()
1299 			idr_destroy(&tap_major->minor_idr);  in tap_destroy_cdev()
1300 			list_del_rcu(&tap_major->next);  in tap_destroy_cdev()
1301 			kfree_rcu(tap_major, rcu);  in tap_destroy_cdev()