drivers/net/tap.c

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