253 static void ppp_channel_push(struct channel *pch);
255 			      struct channel *pch);
262 				struct channel *pch);
278 static int ppp_connect_channel(struct channel *pch, int unit);
279 static int ppp_disconnect_channel(struct channel *pch);
280 static void ppp_destroy_channel(struct channel *pch);
619 		struct channel *pch;  in ppp_ioctl()  local
622 		pch = PF_TO_CHANNEL(pf);  in ppp_ioctl()
628 			err = ppp_connect_channel(pch, unit);  in ppp_ioctl()
632 			err = ppp_disconnect_channel(pch);  in ppp_ioctl()
636 			down_read(&pch->chan_sem);  in ppp_ioctl()
637 			chan = pch->chan;  in ppp_ioctl()
641 			up_read(&pch->chan_sem);  in ppp_ioctl()
1362 	struct channel *pch;  in ppp_push()  local
1379 		pch = list_entry(list, struct channel, clist);  in ppp_push()
1381 		spin_lock_bh(&pch->downl);  in ppp_push()
1382 		if (pch->chan) {  in ppp_push()
1383 			if (pch->chan->ops->start_xmit(pch->chan, skb))  in ppp_push()
1390 		spin_unlock_bh(&pch->downl);  in ppp_push()
1426 	struct channel *pch;  in ppp_mp_explode()  local
1440 	list_for_each_entry(pch, &ppp->channels, clist) {  in ppp_mp_explode()
1441 		if (pch->chan) {  in ppp_mp_explode()
1442 			pch->avail = 1;  in ppp_mp_explode()
1444 			pch->speed = pch->chan->speed;  in ppp_mp_explode()
1446 			pch->avail = 0;  in ppp_mp_explode()
1448 		if (pch->avail) {  in ppp_mp_explode()
1449 			if (skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1450 				!pch->had_frag) {  in ppp_mp_explode()
1451 					if (pch->speed == 0)  in ppp_mp_explode()
1454 						totspeed += pch->speed;  in ppp_mp_explode()
1456 					pch->avail = 2;  in ppp_mp_explode()
1460 			if (!pch->had_frag && i < ppp->nxchan)  in ppp_mp_explode()
1503 		pch = list_entry(list, struct channel, clist);  in ppp_mp_explode()
1505 		if (!pch->avail)  in ppp_mp_explode()
1512 		if (pch->avail == 1) {  in ppp_mp_explode()
1516 			pch->avail = 1;  in ppp_mp_explode()
1520 		spin_lock_bh(&pch->downl);  in ppp_mp_explode()
1521 		if (pch->chan == NULL) {  in ppp_mp_explode()
1523 			if (pch->speed == 0)  in ppp_mp_explode()
1526 				totspeed -= pch->speed;  in ppp_mp_explode()
1528 			spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1529 			pch->avail = 0;  in ppp_mp_explode()
1546 			if (pch->speed == 0) {  in ppp_mp_explode()
1554 					((totspeed*totfree)/pch->speed)) - hdrlen;  in ppp_mp_explode()
1556 					flen += ((totfree - nzero)*pch->speed)/totspeed;  in ppp_mp_explode()
1557 					nbigger -= ((totfree - nzero)*pch->speed)/  in ppp_mp_explode()
1578 			pch->avail = 2;  in ppp_mp_explode()
1579 			spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1588 		mtu = pch->chan->mtu - (hdrlen - 2);  in ppp_mp_explode()
1615 		chan = pch->chan;  in ppp_mp_explode()
1616 		if (!skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1618 			skb_queue_tail(&pch->file.xq, frag);  in ppp_mp_explode()
1619 		pch->had_frag = 1;  in ppp_mp_explode()
1624 		spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1631 	spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1644 ppp_channel_push(struct channel *pch)  in ppp_channel_push()  argument
1649 	spin_lock_bh(&pch->downl);  in ppp_channel_push()
1650 	if (pch->chan) {  in ppp_channel_push()
1651 		while (!skb_queue_empty(&pch->file.xq)) {  in ppp_channel_push()
1652 			skb = skb_dequeue(&pch->file.xq);  in ppp_channel_push()
1653 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {  in ppp_channel_push()
1655 				skb_queue_head(&pch->file.xq, skb);  in ppp_channel_push()
1661 		skb_queue_purge(&pch->file.xq);  in ppp_channel_push()
1663 	spin_unlock_bh(&pch->downl);  in ppp_channel_push()
1665 	if (skb_queue_empty(&pch->file.xq)) {  in ppp_channel_push()
1666 		read_lock_bh(&pch->upl);  in ppp_channel_push()
1667 		ppp = pch->ppp;  in ppp_channel_push()
1670 		read_unlock_bh(&pch->upl);  in ppp_channel_push()
1685 ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_do_recv()  argument
1689 		ppp_receive_frame(ppp, skb, pch);  in ppp_do_recv()
1698 	struct channel *pch = chan->ppp;  in ppp_input()  local
1701 	if (!pch) {  in ppp_input()
1706 	read_lock_bh(&pch->upl);  in ppp_input()
1709 		if (pch->ppp) {  in ppp_input()
1710 			++pch->ppp->dev->stats.rx_length_errors;  in ppp_input()
1711 			ppp_receive_error(pch->ppp);  in ppp_input()
1717 	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {  in ppp_input()
1719 		skb_queue_tail(&pch->file.rq, skb);  in ppp_input()
1721 		while (pch->file.rq.qlen > PPP_MAX_RQLEN &&  in ppp_input()
1722 		       (skb = skb_dequeue(&pch->file.rq)))  in ppp_input()
1724 		wake_up_interruptible(&pch->file.rwait);  in ppp_input()
1726 		ppp_do_recv(pch->ppp, skb, pch);  in ppp_input()
1730 	read_unlock_bh(&pch->upl);  in ppp_input()
1737 	struct channel *pch = chan->ppp;  in ppp_input_error()  local
1740 	if (!pch)  in ppp_input_error()
1743 	read_lock_bh(&pch->upl);  in ppp_input_error()
1744 	if (pch->ppp) {  in ppp_input_error()
1749 			ppp_do_recv(pch->ppp, skb, pch);  in ppp_input_error()
1752 	read_unlock_bh(&pch->upl);  in ppp_input_error()
1760 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_frame()  argument
1768 			ppp_receive_mp_frame(ppp, skb, pch);  in ppp_receive_frame()
1998 ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_mp_frame()  argument
2034 	pch->lastseq = seq;  in ppp_receive_mp_frame()
2285 	struct channel *pch;  in ppp_register_net_channel()  local
2288 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);  in ppp_register_net_channel()
2289 	if (!pch)  in ppp_register_net_channel()
2294 	pch->ppp = NULL;  in ppp_register_net_channel()
2295 	pch->chan = chan;  in ppp_register_net_channel()
2296 	pch->chan_net = get_net(net);  in ppp_register_net_channel()
2297 	chan->ppp = pch;  in ppp_register_net_channel()
2298 	init_ppp_file(&pch->file, CHANNEL);  in ppp_register_net_channel()
2299 	pch->file.hdrlen = chan->hdrlen;  in ppp_register_net_channel()
2301 	pch->lastseq = -1;  in ppp_register_net_channel()
2303 	init_rwsem(&pch->chan_sem);  in ppp_register_net_channel()
2304 	spin_lock_init(&pch->downl);  in ppp_register_net_channel()
2305 	rwlock_init(&pch->upl);  in ppp_register_net_channel()
2308 	pch->file.index = ++pn->last_channel_index;  in ppp_register_net_channel()
2309 	list_add(&pch->list, &pn->new_channels);  in ppp_register_net_channel()
2321 	struct channel *pch = chan->ppp;  in ppp_channel_index()  local
2323 	if (pch)  in ppp_channel_index()
2324 		return pch->file.index;  in ppp_channel_index()
2333 	struct channel *pch = chan->ppp;  in ppp_unit_number()  local
2336 	if (pch) {  in ppp_unit_number()
2337 		read_lock_bh(&pch->upl);  in ppp_unit_number()
2338 		if (pch->ppp)  in ppp_unit_number()
2339 			unit = pch->ppp->file.index;  in ppp_unit_number()
2340 		read_unlock_bh(&pch->upl);  in ppp_unit_number()
2350 	struct channel *pch = chan->ppp;  in ppp_dev_name()  local
2353 	if (pch) {  in ppp_dev_name()
2354 		read_lock_bh(&pch->upl);  in ppp_dev_name()
2355 		if (pch->ppp && pch->ppp->dev)  in ppp_dev_name()
2356 			name = pch->ppp->dev->name;  in ppp_dev_name()
2357 		read_unlock_bh(&pch->upl);  in ppp_dev_name()
2370 	struct channel *pch = chan->ppp;  in ppp_unregister_channel()  local
2373 	if (!pch)  in ppp_unregister_channel()
2382 	down_write(&pch->chan_sem);  in ppp_unregister_channel()
2383 	spin_lock_bh(&pch->downl);  in ppp_unregister_channel()
2384 	pch->chan = NULL;  in ppp_unregister_channel()
2385 	spin_unlock_bh(&pch->downl);  in ppp_unregister_channel()
2386 	up_write(&pch->chan_sem);  in ppp_unregister_channel()
2387 	ppp_disconnect_channel(pch);  in ppp_unregister_channel()
2389 	pn = ppp_pernet(pch->chan_net);  in ppp_unregister_channel()
2391 	list_del(&pch->list);  in ppp_unregister_channel()
2393 	put_net(pch->chan_net);  in ppp_unregister_channel()
2394 	pch->chan_net = NULL;  in ppp_unregister_channel()
2396 	pch->file.dead = 1;  in ppp_unregister_channel()
2397 	wake_up_interruptible(&pch->file.rwait);  in ppp_unregister_channel()
2398 	if (atomic_dec_and_test(&pch->file.refcnt))  in ppp_unregister_channel()
2399 		ppp_destroy_channel(pch);  in ppp_unregister_channel()
2409 	struct channel *pch = chan->ppp;  in ppp_output_wakeup()  local
2411 	if (!pch)  in ppp_output_wakeup()
2413 	ppp_channel_push(pch);  in ppp_output_wakeup()
2896 	struct channel *pch;  in ppp_find_channel()  local
2898 	list_for_each_entry(pch, &pn->new_channels, list) {  in ppp_find_channel()
2899 		if (pch->file.index == unit) {  in ppp_find_channel()
2900 			list_move(&pch->list, &pn->all_channels);  in ppp_find_channel()
2901 			return pch;  in ppp_find_channel()
2905 	list_for_each_entry(pch, &pn->all_channels, list) {  in ppp_find_channel()
2906 		if (pch->file.index == unit)  in ppp_find_channel()
2907 			return pch;  in ppp_find_channel()
2917 ppp_connect_channel(struct channel *pch, int unit)  in ppp_connect_channel()  argument
2924 	pn = ppp_pernet(pch->chan_net);  in ppp_connect_channel()
2930 	write_lock_bh(&pch->upl);  in ppp_connect_channel()
2932 	if (pch->ppp)  in ppp_connect_channel()
2936 	if (pch->file.hdrlen > ppp->file.hdrlen)  in ppp_connect_channel()
2937 		ppp->file.hdrlen = pch->file.hdrlen;  in ppp_connect_channel()
2938 	hdrlen = pch->file.hdrlen + 2;	/* for protocol bytes */  in ppp_connect_channel()
2941 	list_add_tail(&pch->clist, &ppp->channels);  in ppp_connect_channel()
2943 	pch->ppp = ppp;  in ppp_connect_channel()
2949 	write_unlock_bh(&pch->upl);  in ppp_connect_channel()
2959 ppp_disconnect_channel(struct channel *pch)  in ppp_disconnect_channel()  argument
2964 	write_lock_bh(&pch->upl);  in ppp_disconnect_channel()
2965 	ppp = pch->ppp;  in ppp_disconnect_channel()
2966 	pch->ppp = NULL;  in ppp_disconnect_channel()
2967 	write_unlock_bh(&pch->upl);  in ppp_disconnect_channel()
2971 		list_del(&pch->clist);  in ppp_disconnect_channel()
2985 static void ppp_destroy_channel(struct channel *pch)  in ppp_destroy_channel()  argument
2989 	if (!pch->file.dead) {  in ppp_destroy_channel()
2991 		pr_err("ppp: destroying undead channel %p !\n", pch);  in ppp_destroy_channel()
2994 	skb_queue_purge(&pch->file.xq);  in ppp_destroy_channel()
2995 	skb_queue_purge(&pch->file.rq);  in ppp_destroy_channel()
2996 	kfree(pch);  in ppp_destroy_channel()