89 static struct sk_buff* ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *);
94 static int ppp_sync_push(struct syncppp *ap);
95 static void ppp_sync_flush_output(struct syncppp *ap);
96 static void ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
136 	struct syncppp *ap;  in sp_get()  local
139 	ap = tty->disc_data;  in sp_get()
140 	if (ap != NULL)  in sp_get()
141 		refcount_inc(&ap->refcnt);  in sp_get()
143 	return ap;  in sp_get()
146 static void sp_put(struct syncppp *ap)  in sp_put()  argument
148 	if (refcount_dec_and_test(&ap->refcnt))  in sp_put()
149 		complete(&ap->dead_cmp);  in sp_put()
158 	struct syncppp *ap;  in ppp_sync_open()  local
165 	ap = kzalloc(sizeof(*ap), GFP_KERNEL);  in ppp_sync_open()
167 	if (!ap)  in ppp_sync_open()
171 	ap->tty = tty;  in ppp_sync_open()
172 	ap->mru = PPP_MRU;  in ppp_sync_open()
173 	spin_lock_init(&ap->xmit_lock);  in ppp_sync_open()
174 	spin_lock_init(&ap->recv_lock);  in ppp_sync_open()
175 	ap->xaccm[0] = ~0U;  in ppp_sync_open()
176 	ap->xaccm[3] = 0x60000000U;  in ppp_sync_open()
177 	ap->raccm = ~0U;  in ppp_sync_open()
179 	skb_queue_head_init(&ap->rqueue);  in ppp_sync_open()
180 	tasklet_init(&ap->tsk, ppp_sync_process, (unsigned long) ap);  in ppp_sync_open()
182 	refcount_set(&ap->refcnt, 1);  in ppp_sync_open()
183 	init_completion(&ap->dead_cmp);  in ppp_sync_open()
185 	ap->chan.private = ap;  in ppp_sync_open()
186 	ap->chan.ops = &sync_ops;  in ppp_sync_open()
187 	ap->chan.mtu = PPP_MRU;  in ppp_sync_open()
188 	ap->chan.hdrlen = 2;	/* for A/C bytes */  in ppp_sync_open()
190 	ap->chan.speed = speed;  in ppp_sync_open()
191 	err = ppp_register_channel(&ap->chan);  in ppp_sync_open()
195 	tty->disc_data = ap;  in ppp_sync_open()
200 	kfree(ap);  in ppp_sync_open()
216 	struct syncppp *ap;  in ppp_sync_close()  local
219 	ap = tty->disc_data;  in ppp_sync_close()
222 	if (!ap)  in ppp_sync_close()
226 	 * We have now ensured that nobody can start using ap from now  in ppp_sync_close()
232 	if (!refcount_dec_and_test(&ap->refcnt))  in ppp_sync_close()
233 		wait_for_completion(&ap->dead_cmp);  in ppp_sync_close()
234 	tasklet_kill(&ap->tsk);  in ppp_sync_close()
236 	ppp_unregister_channel(&ap->chan);  in ppp_sync_close()
237 	skb_queue_purge(&ap->rqueue);  in ppp_sync_close()
238 	kfree_skb(ap->tpkt);  in ppp_sync_close()
239 	kfree(ap);  in ppp_sync_close()
280 	struct syncppp *ap = sp_get(tty);  in ppp_synctty_ioctl()  local
284 	if (!ap)  in ppp_synctty_ioctl()
290 		if (put_user(ppp_channel_index(&ap->chan), p))  in ppp_synctty_ioctl()
297 		if (put_user(ppp_unit_number(&ap->chan), p))  in ppp_synctty_ioctl()
305 			ppp_sync_flush_output(ap);  in ppp_synctty_ioctl()
321 	sp_put(ap);  in ppp_synctty_ioctl()
337 	struct syncppp *ap = sp_get(tty);  in ppp_sync_receive()  local
340 	if (!ap)  in ppp_sync_receive()
342 	spin_lock_irqsave(&ap->recv_lock, flags);  in ppp_sync_receive()
343 	ppp_sync_input(ap, buf, cflags, count);  in ppp_sync_receive()
344 	spin_unlock_irqrestore(&ap->recv_lock, flags);  in ppp_sync_receive()
345 	if (!skb_queue_empty(&ap->rqueue))  in ppp_sync_receive()
346 		tasklet_schedule(&ap->tsk);  in ppp_sync_receive()
347 	sp_put(ap);  in ppp_sync_receive()
354 	struct syncppp *ap = sp_get(tty);  in ppp_sync_wakeup()  local
357 	if (!ap)  in ppp_sync_wakeup()
359 	set_bit(XMIT_WAKEUP, &ap->xmit_flags);  in ppp_sync_wakeup()
360 	tasklet_schedule(&ap->tsk);  in ppp_sync_wakeup()
361 	sp_put(ap);  in ppp_sync_wakeup()
398 	struct syncppp *ap = chan->private;  in ppp_sync_ioctl()  local
407 		val = ap->flags | ap->rbits;  in ppp_sync_ioctl()
415 		ap->flags = val & ~SC_RCV_BITS;  in ppp_sync_ioctl()
416 		spin_lock_irq(&ap->recv_lock);  in ppp_sync_ioctl()
417 		ap->rbits = val & SC_RCV_BITS;  in ppp_sync_ioctl()
418 		spin_unlock_irq(&ap->recv_lock);  in ppp_sync_ioctl()
423 		if (put_user(ap->xaccm[0], p))  in ppp_sync_ioctl()
428 		if (get_user(ap->xaccm[0], p))  in ppp_sync_ioctl()
434 		if (put_user(ap->raccm, p))  in ppp_sync_ioctl()
439 		if (get_user(ap->raccm, p))  in ppp_sync_ioctl()
445 		if (copy_to_user(argp, ap->xaccm, sizeof(ap->xaccm)))  in ppp_sync_ioctl()
454 		memcpy(ap->xaccm, accm, sizeof(ap->xaccm));  in ppp_sync_ioctl()
459 		if (put_user(ap->mru, (int __user *) argp))  in ppp_sync_ioctl()
468 		ap->mru = val;  in ppp_sync_ioctl()
485 	struct syncppp *ap = (struct syncppp *) arg;  in ppp_sync_process()  local
489 	while ((skb = skb_dequeue(&ap->rqueue)) != NULL) {  in ppp_sync_process()
492 			ppp_input_error(&ap->chan, 0);  in ppp_sync_process()
496 			ppp_input(&ap->chan, skb);  in ppp_sync_process()
500 	if (test_bit(XMIT_WAKEUP, &ap->xmit_flags) && ppp_sync_push(ap))  in ppp_sync_process()
501 		ppp_output_wakeup(&ap->chan);  in ppp_sync_process()
509 ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *skb)  in ppp_sync_txmunge()  argument
525 	if (data[0] == 0 && (ap->flags & SC_COMP_PROT) && !islcp)  in ppp_sync_txmunge()
529 	if ((ap->flags & SC_COMP_AC) == 0 || islcp) {  in ppp_sync_txmunge()
547 	ap->last_xmit = jiffies;  in ppp_sync_txmunge()
549 	if (skb && ap->flags & SC_LOG_OUTPKT)  in ppp_sync_txmunge()
568 	struct syncppp *ap = chan->private;  in ppp_sync_send()  local
570 	ppp_sync_push(ap);  in ppp_sync_send()
572 	if (test_and_set_bit(XMIT_FULL, &ap->xmit_flags))  in ppp_sync_send()
574 	skb = ppp_sync_txmunge(ap, skb);  in ppp_sync_send()
576 		ap->tpkt = skb;  in ppp_sync_send()
578 		clear_bit(XMIT_FULL, &ap->xmit_flags);  in ppp_sync_send()
580 	ppp_sync_push(ap);  in ppp_sync_send()
588 ppp_sync_push(struct syncppp *ap)  in ppp_sync_push()  argument
591 	struct tty_struct *tty = ap->tty;  in ppp_sync_push()
594 	if (!spin_trylock_bh(&ap->xmit_lock))  in ppp_sync_push()
597 		if (test_and_clear_bit(XMIT_WAKEUP, &ap->xmit_flags))  in ppp_sync_push()
599 		if (!tty_stuffed && ap->tpkt) {  in ppp_sync_push()
601 			sent = tty->ops->write(tty, ap->tpkt->data, ap->tpkt->len);  in ppp_sync_push()
604 			if (sent < ap->tpkt->len) {  in ppp_sync_push()
607 				consume_skb(ap->tpkt);  in ppp_sync_push()
608 				ap->tpkt = NULL;  in ppp_sync_push()
609 				clear_bit(XMIT_FULL, &ap->xmit_flags);  in ppp_sync_push()
615 		spin_unlock_bh(&ap->xmit_lock);  in ppp_sync_push()
616 		if (!(test_bit(XMIT_WAKEUP, &ap->xmit_flags) ||  in ppp_sync_push()
617 		      (!tty_stuffed && ap->tpkt)))  in ppp_sync_push()
619 		if (!spin_trylock_bh(&ap->xmit_lock))  in ppp_sync_push()
625 	if (ap->tpkt) {  in ppp_sync_push()
626 		kfree_skb(ap->tpkt);  in ppp_sync_push()
627 		ap->tpkt = NULL;  in ppp_sync_push()
628 		clear_bit(XMIT_FULL, &ap->xmit_flags);  in ppp_sync_push()
631 	spin_unlock_bh(&ap->xmit_lock);  in ppp_sync_push()
640 ppp_sync_flush_output(struct syncppp *ap)  in ppp_sync_flush_output()  argument
644 	spin_lock_bh(&ap->xmit_lock);  in ppp_sync_flush_output()
645 	if (ap->tpkt != NULL) {  in ppp_sync_flush_output()
646 		kfree_skb(ap->tpkt);  in ppp_sync_flush_output()
647 		ap->tpkt = NULL;  in ppp_sync_flush_output()
648 		clear_bit(XMIT_FULL, &ap->xmit_flags);  in ppp_sync_flush_output()
651 	spin_unlock_bh(&ap->xmit_lock);  in ppp_sync_flush_output()
653 		ppp_output_wakeup(&ap->chan);  in ppp_sync_flush_output()
667 ppp_sync_input(struct syncppp *ap, const unsigned char *buf,  in ppp_sync_input()  argument
676 	if (ap->flags & SC_LOG_INPKT)  in ppp_sync_input()
680 	skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2);  in ppp_sync_input()
715 	skb_queue_tail(&ap->rqueue, skb);  in ppp_sync_input()
722 		skb_queue_tail(&ap->rqueue, skb);  in ppp_sync_input()