52 	struct snd_ctl_file *ctl;  in snd_ctl_open()  local
73 	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);  in snd_ctl_open()
74 	if (ctl == NULL) {  in snd_ctl_open()
78 	INIT_LIST_HEAD(&ctl->events);  in snd_ctl_open()
79 	init_waitqueue_head(&ctl->change_sleep);  in snd_ctl_open()
80 	spin_lock_init(&ctl->read_lock);  in snd_ctl_open()
81 	ctl->card = card;  in snd_ctl_open()
82 	ctl->prefer_pcm_subdevice = -1;  in snd_ctl_open()
83 	ctl->prefer_rawmidi_subdevice = -1;  in snd_ctl_open()
84 	ctl->pid = get_pid(task_pid(current));  in snd_ctl_open()
85 	file->private_data = ctl;  in snd_ctl_open()
87 	list_add_tail(&ctl->list, &card->ctl_files);  in snd_ctl_open()
102 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)  in snd_ctl_empty_read_queue()  argument
107 	spin_lock_irqsave(&ctl->read_lock, flags);  in snd_ctl_empty_read_queue()
108 	while (!list_empty(&ctl->events)) {  in snd_ctl_empty_read_queue()
109 		cread = snd_kctl_event(ctl->events.next);  in snd_ctl_empty_read_queue()
113 	spin_unlock_irqrestore(&ctl->read_lock, flags);  in snd_ctl_empty_read_queue()
120 	struct snd_ctl_file *ctl;  in snd_ctl_release()  local
124 	ctl = file->private_data;  in snd_ctl_release()
126 	card = ctl->card;  in snd_ctl_release()
128 	list_del(&ctl->list);  in snd_ctl_release()
133 			if (control->vd[idx].owner == ctl)  in snd_ctl_release()
136 	snd_ctl_empty_read_queue(ctl);  in snd_ctl_release()
137 	put_pid(ctl->pid);  in snd_ctl_release()
138 	kfree(ctl);  in snd_ctl_release()
148 	struct snd_ctl_file *ctl;  in snd_ctl_notify()  local
157 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_notify()
158 		if (!ctl->subscribed)  in snd_ctl_notify()
160 		spin_lock_irqsave(&ctl->read_lock, flags);  in snd_ctl_notify()
161 		list_for_each_entry(ev, &ctl->events, list) {  in snd_ctl_notify()
171 			list_add_tail(&ev->list, &ctl->events);  in snd_ctl_notify()
176 		wake_up(&ctl->change_sleep);  in snd_ctl_notify()
177 		spin_unlock_irqrestore(&ctl->read_lock, flags);  in snd_ctl_notify()
178 		kill_fasync(&ctl->fasync, SIGIO, POLL_IN);  in snd_ctl_notify()
683 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,  in snd_ctl_card_info()  argument
772 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,  in snd_ctl_elem_info()  argument
775 	struct snd_card *card = ctl->card;  in snd_ctl_elem_info()
799 			if (vd->owner == ctl)  in snd_ctl_elem_info()
810 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,  in snd_ctl_elem_info_user()  argument
818 	snd_power_lock(ctl->card);  in snd_ctl_elem_info_user()
819 	result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);  in snd_ctl_elem_info_user()
821 		result = snd_ctl_elem_info(ctl, &info);  in snd_ctl_elem_info_user()
822 	snd_power_unlock(ctl->card);  in snd_ctl_elem_info_user()
1342 	struct snd_ctl_file *ctl;  in snd_ctl_ioctl()  local
1349 	ctl = file->private_data;  in snd_ctl_ioctl()
1350 	card = ctl->card;  in snd_ctl_ioctl()
1357 		return snd_ctl_card_info(card, ctl, cmd, argp);  in snd_ctl_ioctl()
1361 		return snd_ctl_elem_info_user(ctl, argp);  in snd_ctl_ioctl()
1365 		return snd_ctl_elem_write_user(ctl, argp);  in snd_ctl_ioctl()
1367 		return snd_ctl_elem_lock(ctl, argp);  in snd_ctl_ioctl()
1369 		return snd_ctl_elem_unlock(ctl, argp);  in snd_ctl_ioctl()
1371 		return snd_ctl_elem_add_user(ctl, argp, 0);  in snd_ctl_ioctl()
1373 		return snd_ctl_elem_add_user(ctl, argp, 1);  in snd_ctl_ioctl()
1375 		return snd_ctl_elem_remove(ctl, argp);  in snd_ctl_ioctl()
1377 		return snd_ctl_subscribe_events(ctl, ip);  in snd_ctl_ioctl()
1379 		return snd_ctl_tlv_ioctl(ctl, argp, 0);  in snd_ctl_ioctl()
1381 		return snd_ctl_tlv_ioctl(ctl, argp, 1);  in snd_ctl_ioctl()
1383 		return snd_ctl_tlv_ioctl(ctl, argp, -1);  in snd_ctl_ioctl()
1395 		err = p->fioctl(card, ctl, cmd, arg);  in snd_ctl_ioctl()
1409 	struct snd_ctl_file *ctl;  in snd_ctl_read()  local
1413 	ctl = file->private_data;  in snd_ctl_read()
1414 	if (snd_BUG_ON(!ctl || !ctl->card))  in snd_ctl_read()
1416 	if (!ctl->subscribed)  in snd_ctl_read()
1420 	spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1424 		while (list_empty(&ctl->events)) {  in snd_ctl_read()
1431 			add_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
1433 			spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1435 			remove_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
1436 			if (ctl->card->shutdown)  in snd_ctl_read()
1440 			spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1442 		kev = snd_kctl_event(ctl->events.next);  in snd_ctl_read()
1447 		spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1453 		spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1459 	spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1467 	struct snd_ctl_file *ctl;  in snd_ctl_poll()  local
1469 	ctl = file->private_data;  in snd_ctl_poll()
1470 	if (!ctl->subscribed)  in snd_ctl_poll()
1472 	poll_wait(file, &ctl->change_sleep, wait);  in snd_ctl_poll()
1475 	if (!list_empty(&ctl->events))  in snd_ctl_poll()
1557 	struct snd_ctl_file *ctl;  in snd_ctl_fasync()  local
1559 	ctl = file->private_data;  in snd_ctl_fasync()
1560 	return fasync_helper(fd, file, on, &ctl->fasync);  in snd_ctl_fasync()
1616 	struct snd_ctl_file *ctl;  in snd_ctl_dev_disconnect()  local
1626 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_dev_disconnect()
1627 		wake_up(&ctl->change_sleep);  in snd_ctl_dev_disconnect()
1628 		kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);  in snd_ctl_dev_disconnect()