340 	struct major_info *tap_major;  in tap_get_major()  local
342 	list_for_each_entry_rcu(tap_major, &major_list, next) {  in tap_get_major()
343 		if (tap_major->major == major)  in tap_get_major()
344 			return tap_major;  in tap_get_major()
353 	struct major_info *tap_major;  in tap_get_minor()  local
356 	tap_major = tap_get_major(MAJOR(major));  in tap_get_minor()
357 	if (!tap_major) {  in tap_get_minor()
362 	spin_lock(&tap_major->minor_lock);  in tap_get_minor()
363 	retval = idr_alloc(&tap_major->minor_idr, tap, 1, TAP_NUM_DEVS, GFP_ATOMIC);  in tap_get_minor()
370 	spin_unlock(&tap_major->minor_lock);  in tap_get_minor()
380 	struct major_info *tap_major;  in tap_free_minor()  local
383 	tap_major = tap_get_major(MAJOR(major));  in tap_free_minor()
384 	if (!tap_major) {  in tap_free_minor()
388 	spin_lock(&tap_major->minor_lock);  in tap_free_minor()
390 		idr_remove(&tap_major->minor_idr, tap->minor);  in tap_free_minor()
393 	spin_unlock(&tap_major->minor_lock);  in tap_free_minor()
404 	struct major_info *tap_major;  in dev_get_by_tap_file()  local
407 	tap_major = tap_get_major(major);  in dev_get_by_tap_file()
408 	if (!tap_major) {  in dev_get_by_tap_file()
413 	spin_lock(&tap_major->minor_lock);  in dev_get_by_tap_file()
414 	tap = idr_find(&tap_major->minor_idr, minor);  in dev_get_by_tap_file()
419 	spin_unlock(&tap_major->minor_lock);  in dev_get_by_tap_file()
1218 	struct major_info *tap_major;  in tap_list_add()  local
1220 	tap_major = kzalloc(sizeof(*tap_major), GFP_ATOMIC);  in tap_list_add()
1221 	if (!tap_major)  in tap_list_add()
1224 	tap_major->major = MAJOR(major);  in tap_list_add()
1226 	idr_init(&tap_major->minor_idr);  in tap_list_add()
1227 	spin_lock_init(&tap_major->minor_lock);  in tap_list_add()
1229 	tap_major->device_name = device_name;  in tap_list_add()
1231 	list_add_tail_rcu(&tap_major->next, &major_list);  in tap_list_add()
1235 int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,  in tap_create_cdev()  argument
1240 	err = alloc_chrdev_region(tap_major, 0, TAP_NUM_DEVS, device_name);  in tap_create_cdev()
1246 	err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1250 	err =  tap_list_add(*tap_major, device_name);  in tap_create_cdev()
1259 	unregister_chrdev_region(*tap_major, TAP_NUM_DEVS);  in tap_create_cdev()
1267 	struct major_info *tap_major, *tmp;  in tap_destroy_cdev()  local
1271 	list_for_each_entry_safe(tap_major, tmp, &major_list, next) {  in tap_destroy_cdev()
1272 		if (tap_major->major == MAJOR(major)) {  in tap_destroy_cdev()
1273 			idr_destroy(&tap_major->minor_idr);  in tap_destroy_cdev()
1274 			list_del_rcu(&tap_major->next);  in tap_destroy_cdev()
1275 			kfree_rcu(tap_major, rcu);  in tap_destroy_cdev()