131 struct n_hdlc {  struct
153 static struct n_hdlc *n_hdlc_alloc(void);  argument
161 	struct n_hdlc *n_hdlc = tty->disc_data;  in flush_rx_queue()  local
164 	while ((buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list)))  in flush_rx_queue()
165 		n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, buf);  in flush_rx_queue()
170 	struct n_hdlc *n_hdlc = tty->disc_data;  in flush_tx_queue()  local
173 	while ((buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list)))  in flush_tx_queue()
174 		n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, buf);  in flush_tx_queue()
196 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_close()  local
207 	cancel_work_sync(&n_hdlc->write_work);  in n_hdlc_tty_close()
209 	n_hdlc_free_buf_list(&n_hdlc->rx_free_buf_list);  in n_hdlc_tty_close()
210 	n_hdlc_free_buf_list(&n_hdlc->tx_free_buf_list);  in n_hdlc_tty_close()
211 	n_hdlc_free_buf_list(&n_hdlc->rx_buf_list);  in n_hdlc_tty_close()
212 	n_hdlc_free_buf_list(&n_hdlc->tx_buf_list);  in n_hdlc_tty_close()
213 	kfree(n_hdlc);  in n_hdlc_tty_close()
224 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_open()  local
229 	if (n_hdlc) {  in n_hdlc_tty_open()
234 	n_hdlc = n_hdlc_alloc();  in n_hdlc_tty_open()
235 	if (!n_hdlc) {  in n_hdlc_tty_open()
240 	INIT_WORK(&n_hdlc->write_work, n_hdlc_tty_write_work);  in n_hdlc_tty_open()
241 	n_hdlc->tty_for_write_work = tty;  in n_hdlc_tty_open()
242 	tty->disc_data = n_hdlc;  in n_hdlc_tty_open()
264 static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)  in n_hdlc_send_frames()  argument
272 	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
273 	if (n_hdlc->tbusy) {  in n_hdlc_send_frames()
274 		n_hdlc->woke_up = true;  in n_hdlc_send_frames()
275 		spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
278 	n_hdlc->tbusy = true;  in n_hdlc_send_frames()
279 	n_hdlc->woke_up = false;  in n_hdlc_send_frames()
280 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
282 	tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_send_frames()
292 			n_hdlc_buf_return(&n_hdlc->tx_buf_list, tbuf);  in n_hdlc_send_frames()
304 			n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, tbuf);  in n_hdlc_send_frames()
310 			tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_send_frames()
318 			n_hdlc_buf_return(&n_hdlc->tx_buf_list, tbuf);  in n_hdlc_send_frames()
327 	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
328 	n_hdlc->tbusy = false;  in n_hdlc_send_frames()
329 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
331 	if (n_hdlc->woke_up)  in n_hdlc_send_frames()
343 	struct n_hdlc *n_hdlc = container_of(work, struct n_hdlc, write_work);  in n_hdlc_tty_write_work()  local
344 	struct tty_struct *tty = n_hdlc->tty_for_write_work;  in n_hdlc_tty_write_work()
346 	n_hdlc_send_frames(n_hdlc, tty);  in n_hdlc_tty_write_work()
357 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_wakeup()  local
359 	schedule_work(&n_hdlc->write_work);  in n_hdlc_tty_wakeup()
375 	register struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_receive()  local
386 	buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);  in n_hdlc_tty_receive()
392 		if (n_hdlc->rx_buf_list.count < MAX_RX_BUF_COUNT)  in n_hdlc_tty_receive()
407 	n_hdlc_buf_put(&n_hdlc->rx_buf_list, buf);  in n_hdlc_tty_receive()
431 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_read()  local
453 		rbuf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);  in n_hdlc_tty_read()
502 	if (n_hdlc->rx_free_buf_list.count > DEFAULT_RX_BUF_COUNT)  in n_hdlc_tty_read()
505 		n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, rbuf);  in n_hdlc_tty_read()
523 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_write()  local
542 		tbuf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);  in n_hdlc_tty_write()
567 		n_hdlc_buf_put(&n_hdlc->tx_buf_list, tbuf);  in n_hdlc_tty_write()
568 		n_hdlc_send_frames(n_hdlc, tty);  in n_hdlc_tty_write()
586 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_ioctl()  local
598 		spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock, flags);  in n_hdlc_tty_ioctl()
599 		buf = list_first_entry_or_null(&n_hdlc->rx_buf_list.list,  in n_hdlc_tty_ioctl()
605 		spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock, flags);  in n_hdlc_tty_ioctl()
613 		spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_tty_ioctl()
614 		buf = list_first_entry_or_null(&n_hdlc->tx_buf_list.list,  in n_hdlc_tty_ioctl()
618 		spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_tty_ioctl()
651 	struct n_hdlc *n_hdlc = tty->disc_data;  in n_hdlc_tty_poll()  local
662 	if (!list_empty(&n_hdlc->rx_buf_list.list))  in n_hdlc_tty_poll()
669 			!list_empty(&n_hdlc->tx_free_buf_list.list))  in n_hdlc_tty_poll()
697 static struct n_hdlc *n_hdlc_alloc(void)  in n_hdlc_alloc()
699 	struct n_hdlc *n_hdlc = kzalloc(sizeof(*n_hdlc), GFP_KERNEL);  in n_hdlc_alloc()  local
701 	if (!n_hdlc)  in n_hdlc_alloc()
704 	spin_lock_init(&n_hdlc->rx_free_buf_list.spinlock);  in n_hdlc_alloc()
705 	spin_lock_init(&n_hdlc->tx_free_buf_list.spinlock);  in n_hdlc_alloc()
706 	spin_lock_init(&n_hdlc->rx_buf_list.spinlock);  in n_hdlc_alloc()
707 	spin_lock_init(&n_hdlc->tx_buf_list.spinlock);  in n_hdlc_alloc()
709 	INIT_LIST_HEAD(&n_hdlc->rx_free_buf_list.list);  in n_hdlc_alloc()
710 	INIT_LIST_HEAD(&n_hdlc->tx_free_buf_list.list);  in n_hdlc_alloc()
711 	INIT_LIST_HEAD(&n_hdlc->rx_buf_list.list);  in n_hdlc_alloc()
712 	INIT_LIST_HEAD(&n_hdlc->tx_buf_list.list);  in n_hdlc_alloc()
714 	n_hdlc_alloc_buf(&n_hdlc->rx_free_buf_list, DEFAULT_RX_BUF_COUNT, "rx");  in n_hdlc_alloc()
715 	n_hdlc_alloc_buf(&n_hdlc->tx_free_buf_list, DEFAULT_TX_BUF_COUNT, "tx");  in n_hdlc_alloc()
717 	return n_hdlc;  in n_hdlc_alloc()