48 	struct snd_ctl_file *ctl;  in snd_ctl_open()  local
69 	ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);  in snd_ctl_open()
70 	if (ctl == NULL) {  in snd_ctl_open()
74 	INIT_LIST_HEAD(&ctl->events);  in snd_ctl_open()
75 	init_waitqueue_head(&ctl->change_sleep);  in snd_ctl_open()
76 	spin_lock_init(&ctl->read_lock);  in snd_ctl_open()
77 	ctl->card = card;  in snd_ctl_open()
79 		ctl->preferred_subdevice[i] = -1;  in snd_ctl_open()
80 	ctl->pid = get_pid(task_pid(current));  in snd_ctl_open()
81 	file->private_data = ctl;  in snd_ctl_open()
83 		list_add_tail(&ctl->list, &card->ctl_files);  in snd_ctl_open()
97 static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl)  in snd_ctl_empty_read_queue()  argument
101 	guard(spinlock_irqsave)(&ctl->read_lock);  in snd_ctl_empty_read_queue()
102 	while (!list_empty(&ctl->events)) {  in snd_ctl_empty_read_queue()
103 		cread = snd_kctl_event(ctl->events.next);  in snd_ctl_empty_read_queue()
112 	struct snd_ctl_file *ctl;  in snd_ctl_release()  local
116 	ctl = file->private_data;  in snd_ctl_release()
118 	card = ctl->card;  in snd_ctl_release()
121 		list_del(&ctl->list);  in snd_ctl_release()
126 				if (control->vd[idx].owner == ctl)  in snd_ctl_release()
130 	snd_fasync_free(ctl->fasync);  in snd_ctl_release()
131 	snd_ctl_empty_read_queue(ctl);  in snd_ctl_release()
132 	put_pid(ctl->pid);  in snd_ctl_release()
133 	kfree(ctl);  in snd_ctl_release()
152 	struct snd_ctl_file *ctl;  in snd_ctl_notify()  local
164 	list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_notify()
165 		if (!ctl->subscribed)  in snd_ctl_notify()
167 		scoped_guard(spinlock, &ctl->read_lock) {  in snd_ctl_notify()
168 			list_for_each_entry(ev, &ctl->events, list) {  in snd_ctl_notify()
178 				list_add_tail(&ev->list, &ctl->events);  in snd_ctl_notify()
183 			wake_up(&ctl->change_sleep);  in snd_ctl_notify()
185 		snd_kill_fasync(ctl->fasync, SIGIO, POLL_IN);  in snd_ctl_notify()
867 static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl,  in snd_ctl_card_info()  argument
1128 			       struct snd_ctl_file *ctl)  in __snd_ctl_elem_info()  argument
1146 			if (vd->owner == ctl)  in __snd_ctl_elem_info()
1159 static int snd_ctl_elem_info(struct snd_ctl_file *ctl,  in snd_ctl_elem_info()  argument
1162 	struct snd_card *card = ctl->card;  in snd_ctl_elem_info()
1169 	return __snd_ctl_elem_info(card, kctl, info, ctl);  in snd_ctl_elem_info()
1172 static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl,  in snd_ctl_elem_info_user()  argument
1175 	struct snd_card *card = ctl->card;  in snd_ctl_elem_info_user()
1184 	result = snd_ctl_elem_info(ctl, &info);  in snd_ctl_elem_info_user()
1901 	struct snd_ctl_file *ctl;  in snd_ctl_ioctl()  local
1908 	ctl = file->private_data;  in snd_ctl_ioctl()
1909 	card = ctl->card;  in snd_ctl_ioctl()
1916 		return snd_ctl_card_info(card, ctl, cmd, argp);  in snd_ctl_ioctl()
1920 		return snd_ctl_elem_info_user(ctl, argp);  in snd_ctl_ioctl()
1924 		return snd_ctl_elem_write_user(ctl, argp);  in snd_ctl_ioctl()
1926 		return snd_ctl_elem_lock(ctl, argp);  in snd_ctl_ioctl()
1928 		return snd_ctl_elem_unlock(ctl, argp);  in snd_ctl_ioctl()
1930 		return snd_ctl_elem_add_user(ctl, argp, 0);  in snd_ctl_ioctl()
1932 		return snd_ctl_elem_add_user(ctl, argp, 1);  in snd_ctl_ioctl()
1934 		return snd_ctl_elem_remove(ctl, argp);  in snd_ctl_ioctl()
1936 		return snd_ctl_subscribe_events(ctl, ip);  in snd_ctl_ioctl()
1942 			err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ);  in snd_ctl_ioctl()
1950 			err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE);  in snd_ctl_ioctl()
1958 			err = snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD);  in snd_ctl_ioctl()
1969 		err = p->fioctl(card, ctl, cmd, arg);  in snd_ctl_ioctl()
1980 	struct snd_ctl_file *ctl;  in snd_ctl_read()  local
1984 	ctl = file->private_data;  in snd_ctl_read()
1985 	if (snd_BUG_ON(!ctl || !ctl->card))  in snd_ctl_read()
1987 	if (!ctl->subscribed)  in snd_ctl_read()
1991 	spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
1995 		while (list_empty(&ctl->events)) {  in snd_ctl_read()
2002 			add_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
2004 			spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
2006 			remove_wait_queue(&ctl->change_sleep, &wait);  in snd_ctl_read()
2007 			if (ctl->card->shutdown)  in snd_ctl_read()
2011 			spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
2013 		kev = snd_kctl_event(ctl->events.next);  in snd_ctl_read()
2018 		spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
2024 		spin_lock_irq(&ctl->read_lock);  in snd_ctl_read()
2030 	spin_unlock_irq(&ctl->read_lock);  in snd_ctl_read()
2038 	struct snd_ctl_file *ctl;  in snd_ctl_poll()  local
2040 	ctl = file->private_data;  in snd_ctl_poll()
2041 	if (!ctl->subscribed)  in snd_ctl_poll()
2043 	poll_wait(file, &ctl->change_sleep, wait);  in snd_ctl_poll()
2046 	if (!list_empty(&ctl->events))  in snd_ctl_poll()
2149 	struct snd_ctl_file *ctl;  in snd_ctl_fasync()  local
2151 	ctl = file->private_data;  in snd_ctl_fasync()
2152 	return snd_fasync_helper(fd, file, on, &ctl->fasync);  in snd_ctl_fasync()
2310 	struct snd_ctl_file *ctl;  in snd_ctl_dev_disconnect()  local
2313 		list_for_each_entry(ctl, &card->ctl_files, list) {  in snd_ctl_dev_disconnect()
2314 			wake_up(&ctl->change_sleep);  in snd_ctl_dev_disconnect()
2315 			snd_kill_fasync(ctl->fasync, SIGIO, POLL_ERR);  in snd_ctl_dev_disconnect()