145 struct n_hdlc {  struct
169 static struct n_hdlc *n_hdlc_alloc (void);  argument
196 #define tty2n_hdlc(tty)	((struct n_hdlc *) ((tty)->disc_data))
197 #define n_hdlc2tty(n_hdlc)	((n_hdlc)->tty)  argument
201 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in flush_rx_queue()  local
204 	while ((buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list)))  in flush_rx_queue()
205 		n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, buf);  in flush_rx_queue()
210 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in flush_tx_queue()  local
214 	while ((buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list)))  in flush_tx_queue()
215 		n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, buf);  in flush_tx_queue()
216  	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in flush_tx_queue()
217 	if (n_hdlc->tbuf) {  in flush_tx_queue()
218 		n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, n_hdlc->tbuf);  in flush_tx_queue()
219 		n_hdlc->tbuf = NULL;  in flush_tx_queue()
221 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in flush_tx_queue()
243 static void n_hdlc_release(struct n_hdlc *n_hdlc)  in n_hdlc_release()  argument
245 	struct tty_struct *tty = n_hdlc2tty (n_hdlc);  in n_hdlc_release()
255 	if (tty->disc_data == n_hdlc)  in n_hdlc_release()
260 		buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);  in n_hdlc_release()
267 		buf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);  in n_hdlc_release()
274 		buf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);  in n_hdlc_release()
281 		buf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_release()
287 	kfree(n_hdlc->tbuf);  in n_hdlc_release()
288 	kfree(n_hdlc);  in n_hdlc_release()
301 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_close()  local
306 	if (n_hdlc != NULL) {  in n_hdlc_tty_close()
307 		if (n_hdlc->magic != HDLC_MAGIC) {  in n_hdlc_tty_close()
315 		if (tty == n_hdlc->backup_tty)  in n_hdlc_tty_close()
316 			n_hdlc->backup_tty = NULL;  in n_hdlc_tty_close()
317 		if (tty != n_hdlc->tty)  in n_hdlc_tty_close()
319 		if (n_hdlc->backup_tty) {  in n_hdlc_tty_close()
320 			n_hdlc->tty = n_hdlc->backup_tty;  in n_hdlc_tty_close()
322 			n_hdlc_release (n_hdlc);  in n_hdlc_tty_close()
339 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_open()  local
347 	if (n_hdlc) {  in n_hdlc_tty_open()
352 	n_hdlc = n_hdlc_alloc();  in n_hdlc_tty_open()
353 	if (!n_hdlc) {  in n_hdlc_tty_open()
358 	tty->disc_data = n_hdlc;  in n_hdlc_tty_open()
359 	n_hdlc->tty    = tty;  in n_hdlc_tty_open()
386 static void n_hdlc_send_frames(struct n_hdlc *n_hdlc, struct tty_struct *tty)  in n_hdlc_send_frames()  argument
396  	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
397 	if (n_hdlc->tbusy) {  in n_hdlc_send_frames()
398 		n_hdlc->woke_up = 1;  in n_hdlc_send_frames()
399  		spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
402 	n_hdlc->tbusy = 1;  in n_hdlc_send_frames()
403 	n_hdlc->woke_up = 0;  in n_hdlc_send_frames()
404 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
409 	tbuf = n_hdlc->tbuf;  in n_hdlc_send_frames()
411 		tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_send_frames()
424 			n_hdlc->tbuf = tbuf;  in n_hdlc_send_frames()
438 			n_hdlc_buf_put(&n_hdlc->tx_free_buf_list, tbuf);  in n_hdlc_send_frames()
441 			n_hdlc->tbuf = NULL;  in n_hdlc_send_frames()
447 			tbuf = n_hdlc_buf_get(&n_hdlc->tx_buf_list);  in n_hdlc_send_frames()
455 			n_hdlc->tbuf = tbuf;  in n_hdlc_send_frames()
464 	spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock, flags);  in n_hdlc_send_frames()
465 	n_hdlc->tbusy = 0;  in n_hdlc_send_frames()
466 	spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock, flags);   in n_hdlc_send_frames()
468         if (n_hdlc->woke_up)  in n_hdlc_send_frames()
484 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_wakeup()  local
489 	if (!n_hdlc)  in n_hdlc_tty_wakeup()
492 	if (tty != n_hdlc->tty) {  in n_hdlc_tty_wakeup()
497 	n_hdlc_send_frames (n_hdlc, tty);  in n_hdlc_tty_wakeup()
514 	register struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_receive()  local
522 	if (!n_hdlc || tty != n_hdlc->tty)  in n_hdlc_tty_receive()
526 	if (n_hdlc->magic != HDLC_MAGIC) {  in n_hdlc_tty_receive()
540 	buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);  in n_hdlc_tty_receive()
544 		if (n_hdlc->rx_buf_list.count < MAX_RX_BUF_COUNT)  in n_hdlc_tty_receive()
560 	n_hdlc_buf_put(&n_hdlc->rx_buf_list, buf);  in n_hdlc_tty_receive()
564 	if (n_hdlc->tty->fasync != NULL)  in n_hdlc_tty_receive()
565 		kill_fasync (&n_hdlc->tty->fasync, SIGIO, POLL_IN);  in n_hdlc_tty_receive()
581 	struct n_hdlc *n_hdlc = tty2n_hdlc(tty);  in n_hdlc_tty_read()  local
590 	if (!n_hdlc)  in n_hdlc_tty_read()
612 		rbuf = n_hdlc_buf_get(&n_hdlc->rx_buf_list);  in n_hdlc_tty_read()
624 			if (n_hdlc->rx_free_buf_list.count >  in n_hdlc_tty_read()
628 				n_hdlc_buf_put(&n_hdlc->rx_free_buf_list, rbuf);  in n_hdlc_tty_read()
665 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()  local
675 	if (!n_hdlc)  in n_hdlc_tty_write()
678 	if (n_hdlc->magic != HDLC_MAGIC)  in n_hdlc_tty_write()
696 		tbuf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);  in n_hdlc_tty_write()
706 		n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_write()
707 		if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC ||   in n_hdlc_tty_write()
708 		    tty != n_hdlc->tty) {  in n_hdlc_tty_write()
709 			printk("n_hdlc_tty_write: %p invalid after wait!\n", n_hdlc);  in n_hdlc_tty_write()
729 		n_hdlc_buf_put(&n_hdlc->tx_buf_list,tbuf);  in n_hdlc_tty_write()
730 		n_hdlc_send_frames(n_hdlc,tty);  in n_hdlc_tty_write()
749 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_ioctl()  local
759 	if (!n_hdlc || n_hdlc->magic != HDLC_MAGIC)  in n_hdlc_tty_ioctl()
766 		spin_lock_irqsave(&n_hdlc->rx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
767 		if (n_hdlc->rx_buf_list.head)  in n_hdlc_tty_ioctl()
768 			count = n_hdlc->rx_buf_list.head->count;  in n_hdlc_tty_ioctl()
771 		spin_unlock_irqrestore(&n_hdlc->rx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
779 		spin_lock_irqsave(&n_hdlc->tx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
780 		if (n_hdlc->tx_buf_list.head)  in n_hdlc_tty_ioctl()
781 			count += n_hdlc->tx_buf_list.head->count;  in n_hdlc_tty_ioctl()
782 		spin_unlock_irqrestore(&n_hdlc->tx_buf_list.spinlock,flags);  in n_hdlc_tty_ioctl()
815 	struct n_hdlc *n_hdlc = tty2n_hdlc (tty);  in n_hdlc_tty_poll()  local
821 	if (n_hdlc && n_hdlc->magic == HDLC_MAGIC && tty == n_hdlc->tty) {  in n_hdlc_tty_poll()
829 		if (n_hdlc->rx_buf_list.head)  in n_hdlc_tty_poll()
836 				n_hdlc->tx_free_buf_list.head)  in n_hdlc_tty_poll()
847 static struct n_hdlc *n_hdlc_alloc(void)  in n_hdlc_alloc()
851 	struct n_hdlc *n_hdlc = kzalloc(sizeof(*n_hdlc), GFP_KERNEL);  in n_hdlc_alloc()  local
853 	if (!n_hdlc)  in n_hdlc_alloc()
856 	n_hdlc_buf_list_init(&n_hdlc->rx_free_buf_list);  in n_hdlc_alloc()
857 	n_hdlc_buf_list_init(&n_hdlc->tx_free_buf_list);  in n_hdlc_alloc()
858 	n_hdlc_buf_list_init(&n_hdlc->rx_buf_list);  in n_hdlc_alloc()
859 	n_hdlc_buf_list_init(&n_hdlc->tx_buf_list);  in n_hdlc_alloc()
865 			n_hdlc_buf_put(&n_hdlc->rx_free_buf_list,buf);  in n_hdlc_alloc()
874 			n_hdlc_buf_put(&n_hdlc->tx_free_buf_list,buf);  in n_hdlc_alloc()
880 	n_hdlc->magic  = HDLC_MAGIC;  in n_hdlc_alloc()
881 	n_hdlc->flags  = 0;  in n_hdlc_alloc()
883 	return n_hdlc;  in n_hdlc_alloc()