39 	struct snd_ctl_file *ctl;  in snd_ctl_open()  local
60 	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);  in snd_ctl_open()
61 	if (ctl == NULL) {  in snd_ctl_open()
65 	INIT_LIST_HEAD(&ctl->events);  in snd_ctl_open()
66 	init_waitqueue_head(&ctl->change_sleep);  in snd_ctl_open()
67 	spin_lock_init(&ctl->read_lock);  in snd_ctl_open()
68 	ctl->card = card;  in snd_ctl_open()
70 		ctl->preferred_subdevice[i] = -1;  in snd_ctl_open()
71 	ctl->pid = get_pid(task_pid(current));  in snd_ctl_open()
72 	file->private_data = ctl;  in snd_ctl_open()
74 	list_add_tail(&ctl->list, &card->ctl_files);  in snd_ctl_open()
89 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)  in snd_ctl_empty_read_queue()  argument
94 	spin_lock_irqsave(&ctl->read_lock, flags);  in snd_ctl_empty_read_queue()
95 	while (!list_empty(&ctl->events)) {  in snd_ctl_empty_read_queue()
96 		cread = snd_kctl_event(ctl->events.next);  in snd_ctl_empty_read_queue()
100 	spin_unlock_irqrestore(&ctl->read_lock, flags);  in snd_ctl_empty_read_queue()
107 	struct snd_ctl_file *ctl;  in snd_ctl_release()  local
111 	ctl = file->private_data;  in snd_ctl_release()
113 	card = ctl->card;  in snd_ctl_release()
115 	list_del(&ctl->list);  in snd_ctl_release()
120 			if (control->vd[idx].owner == ctl)  in snd_ctl_release()
123 	snd_ctl_empty_read_queue(ctl);  in snd_ctl_release()
124 	put_pid(ctl->pid);  in snd_ctl_release()
125 	kfree(ctl);  in snd_ctl_release()
145 	struct snd_ctl_file *ctl;  in snd_ctl_notify()  local
156 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_notify()
157 		if (!ctl->subscribed)  in snd_ctl_notify()
159 		spin_lock_irqsave(&ctl->read_lock, flags);  in snd_ctl_notify()
160 		list_for_each_entry(ev, &ctl->events, list) {  in snd_ctl_notify()
170 			list_add_tail(&ev->list, &ctl->events);  in snd_ctl_notify()
175 		wake_up(&ctl->change_sleep);  in snd_ctl_notify()
176 		spin_unlock_irqrestore(&ctl->read_lock, flags);  in snd_ctl_notify()
177 		kill_fasync(&ctl->fasync, SIGIO, POLL_IN);  in snd_ctl_notify()
692 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,  in snd_ctl_card_info()  argument
791 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,  in snd_ctl_elem_info()  argument
794 	struct snd_card *card = ctl->card;  in snd_ctl_elem_info()
818 			if (vd->owner == ctl)  in snd_ctl_elem_info()
829 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,  in snd_ctl_elem_info_user()  argument
837 	result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);  in snd_ctl_elem_info_user()
840 	result = snd_ctl_elem_info(ctl, &info);  in snd_ctl_elem_info_user()
1511 	struct snd_ctl_file *ctl;  in snd_ctl_ioctl()  local
1518 	ctl = file->private_data;  in snd_ctl_ioctl()
1519 	card = ctl->card;  in snd_ctl_ioctl()
1526 		return snd_ctl_card_info(card, ctl, cmd, argp);  in snd_ctl_ioctl()
1530 		return snd_ctl_elem_info_user(ctl, argp);  in snd_ctl_ioctl()
1534 		return snd_ctl_elem_write_user(ctl, argp);  in snd_ctl_ioctl()
1536 		return snd_ctl_elem_lock(ctl, argp);  in snd_ctl_ioctl()
1538 		return snd_ctl_elem_unlock(ctl, argp);  in snd_ctl_ioctl()
1540 		return snd_ctl_elem_add_user(ctl, argp, 0);  in snd_ctl_ioctl()
1542 		return snd_ctl_elem_add_user(ctl, argp, 1);  in snd_ctl_ioctl()
1544 		return snd_ctl_elem_remove(ctl, argp);  in snd_ctl_ioctl()
1546 		return snd_ctl_subscribe_events(ctl, ip);  in snd_ctl_ioctl()
1548 		down_read(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1549 		err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);  in snd_ctl_ioctl()
1550 		up_read(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1553 		down_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1554 		err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);  in snd_ctl_ioctl()
1555 		up_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1558 		down_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1559 		err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);  in snd_ctl_ioctl()
1560 		up_write(&ctl->card->controls_rwsem);  in snd_ctl_ioctl()
1573 		err = p->fioctl(card, ctl, cmd, arg);  in snd_ctl_ioctl()
1587 	struct snd_ctl_file *ctl;  in snd_ctl_read()  local
1591 	ctl = file->private_data;  in snd_ctl_read()
1592 	if (snd_BUG_ON(!ctl || !ctl->card))  in snd_ctl_read()
1594 	if (!ctl->subscribed)  in snd_ctl_read()
1598 	spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1602 		while (list_empty(&ctl->events)) {  in snd_ctl_read()
1609 			add_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
1611 			spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1613 			remove_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
1614 			if (ctl->card->shutdown)  in snd_ctl_read()
1618 			spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1620 		kev = snd_kctl_event(ctl->events.next);  in snd_ctl_read()
1625 		spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1631 		spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1637 	spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
1645 	struct snd_ctl_file *ctl;  in snd_ctl_poll()  local
1647 	ctl = file->private_data;  in snd_ctl_poll()
1648 	if (!ctl->subscribed)  in snd_ctl_poll()
1650 	poll_wait(file, &ctl->change_sleep, wait);  in snd_ctl_poll()
1653 	if (!list_empty(&ctl->events))  in snd_ctl_poll()
1751 	struct snd_ctl_file *ctl;  in snd_ctl_fasync()  local
1753 	ctl = file->private_data;  in snd_ctl_fasync()
1754 	return fasync_helper(fd, file, on, &ctl->fasync);  in snd_ctl_fasync()
1821 	struct snd_ctl_file *ctl;  in snd_ctl_dev_disconnect()  local
1824 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_dev_disconnect()
1825 		wake_up(&ctl->change_sleep);  in snd_ctl_dev_disconnect()
1826 		kill_fasync(&ctl->fasync, SIGIO, POLL_ERR);  in snd_ctl_dev_disconnect()