54 	struct snd_ctl_file *ctl;  in snd_ctl_open()  local
75 	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);  in snd_ctl_open()
76 	if (ctl == NULL) {  in snd_ctl_open()
80 	INIT_LIST_HEAD(&ctl->events);  in snd_ctl_open()
81 	init_waitqueue_head(&ctl->change_sleep);  in snd_ctl_open()
82 	spin_lock_init(&ctl->read_lock);  in snd_ctl_open()
83 	ctl->card = card;  in snd_ctl_open()
85 		ctl->preferred_subdevice[i] = -1;  in snd_ctl_open()
86 	ctl->pid = get_pid(task_pid(current));  in snd_ctl_open()
87 	file->private_data = ctl;  in snd_ctl_open()
89 	list_add_tail(&ctl->list, &card->ctl_files);  in snd_ctl_open()
104 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)  in snd_ctl_empty_read_queue()  argument
109 	spin_lock_irqsave(&ctl->read_lock, flags);  in snd_ctl_empty_read_queue()
110 	while (!list_empty(&ctl->events)) {  in snd_ctl_empty_read_queue()
111 		cread = snd_kctl_event(ctl->events.next);  in snd_ctl_empty_read_queue()
115 	spin_unlock_irqrestore(&ctl->read_lock, flags);  in snd_ctl_empty_read_queue()
122 	struct snd_ctl_file *ctl;  in snd_ctl_release()  local
126 	ctl = file->private_data;  in snd_ctl_release()
128 	card = ctl->card;  in snd_ctl_release()
130 	list_del(&ctl->list);  in snd_ctl_release()
135 			if (control->vd[idx].owner == ctl)  in snd_ctl_release()
138 	snd_ctl_empty_read_queue(ctl);  in snd_ctl_release()
139 	put_pid(ctl->pid);  in snd_ctl_release()
140 	kfree(ctl);  in snd_ctl_release()
160 	struct snd_ctl_file *ctl;  in snd_ctl_notify()  local
171 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_notify()
172 		if (!ctl->subscribed)  in snd_ctl_notify()
174 		spin_lock_irqsave(&ctl->read_lock, flags);  in snd_ctl_notify()
175 		list_for_each_entry(ev, &ctl->events, list) {  in snd_ctl_notify()
185 			list_add_tail(&ev->list, &ctl->events);  in snd_ctl_notify()
190 		wake_up(&ctl->change_sleep);  in snd_ctl_notify()
191 		spin_unlock_irqrestore(&ctl->read_lock, flags);  in snd_ctl_notify()
192 		kill_fasync(&ctl->fasync, SIGIO, POLL_IN);  in snd_ctl_notify()
723 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,  in snd_ctl_card_info()  argument
822 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,  in snd_ctl_elem_info()  argument
825 	struct snd_card *card = ctl->card;  in snd_ctl_elem_info()
849 			if (vd->owner == ctl)  in snd_ctl_elem_info()
860 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,  in snd_ctl_elem_info_user()  argument
868 	result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);  in snd_ctl_elem_info_user()
871 	result = snd_ctl_elem_info(ctl, &info);  in snd_ctl_elem_info_user()
1539 	struct snd_ctl_file *ctl;  in snd_ctl_ioctl()  local
1546 	ctl = file->private_data;  in snd_ctl_ioctl()
1547 	card = ctl->card;  in snd_ctl_ioctl()
1554 		return snd_ctl_card_info(card, ctl, cmd, argp);  in snd_ctl_ioctl()
1558 		return snd_ctl_elem_info_user(ctl, argp);  in snd_ctl_ioctl()
1562 		return snd_ctl_elem_write_user(ctl, argp);  in snd_ctl_ioctl()
1564 		return snd_ctl_elem_lock(ctl, argp);  in snd_ctl_ioctl()
1566 		return snd_ctl_elem_unlock(ctl, argp);  in snd_ctl_ioctl()
1568 		return snd_ctl_elem_add_user(ctl, argp, 0);  in snd_ctl_ioctl()
1570 		return snd_ctl_elem_add_user(ctl, argp, 1);  in snd_ctl_ioctl()
1572 		return snd_ctl_elem_remove(ctl, argp);  in snd_ctl_ioctl()
1574 		return snd_ctl_subscribe_events(ctl, ip);  in snd_ctl_ioctl()
1576 		down_read(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1577 		err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);  in snd_ctl_ioctl()
1578 		up_read(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1581 		down_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1582 		err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);  in snd_ctl_ioctl()
1583 		up_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1586 		down_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1587 		err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);  in snd_ctl_ioctl()
1588 		up_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1601 		err = p->fioctl(card, ctl, cmd, arg);  in snd_ctl_ioctl()
1615 	struct snd_ctl_file *ctl;  in snd_ctl_read()  local
1619 	ctl = file->private_data;  in snd_ctl_read()
1620 	if (snd_BUG_ON(!ctl || !ctl->card))  in snd_ctl_read()
1622 	if (!ctl->subscribed)  in snd_ctl_read()
1626 	spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1630 		while (list_empty(&ctl->events)) {  in snd_ctl_read()
1637 			add_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
1639 			spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1641 			remove_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
1642 			if (ctl->card->shutdown)  in snd_ctl_read()
1646 			spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1648 		kev = snd_kctl_event(ctl->events.next);  in snd_ctl_read()
1653 		spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1659 		spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1665 	spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1673 	struct snd_ctl_file *ctl;  in snd_ctl_poll()  local
1675 	ctl = file->private_data;  in snd_ctl_poll()
1676 	if (!ctl->subscribed)  in snd_ctl_poll()
1678 	poll_wait(file, &ctl->change_sleep, wait);  in snd_ctl_poll()
1681 	if (!list_empty(&ctl->events))  in snd_ctl_poll()
1779 	struct snd_ctl_file *ctl;  in snd_ctl_fasync()  local
1781 	ctl = file->private_data;  in snd_ctl_fasync()
1782 	return fasync_helper(fd, file, on, &ctl->fasync);  in snd_ctl_fasync()
1849 	struct snd_ctl_file *ctl;  in snd_ctl_dev_disconnect()  local
1852 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_dev_disconnect()
1853 		wake_up(&ctl->change_sleep);  in snd_ctl_dev_disconnect()
1854 		kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);  in snd_ctl_dev_disconnect()