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);
610 		struct channel *pch;  in ppp_ioctl()  local
614 		pch = PF_TO_CHANNEL(pf);  in ppp_ioctl()
620 			err = ppp_connect_channel(pch, unit);  in ppp_ioctl()
624 			err = ppp_disconnect_channel(pch);  in ppp_ioctl()
628 			down_read(&pch->chan_sem);  in ppp_ioctl()
629 			chan = pch->chan;  in ppp_ioctl()
633 			up_read(&pch->chan_sem);  in ppp_ioctl()
1315 	struct channel *pch;  in ppp_push()  local
1332 		pch = list_entry(list, struct channel, clist);  in ppp_push()
1334 		spin_lock_bh(&pch->downl);  in ppp_push()
1335 		if (pch->chan) {  in ppp_push()
1336 			if (pch->chan->ops->start_xmit(pch->chan, skb))  in ppp_push()
1343 		spin_unlock_bh(&pch->downl);  in ppp_push()
1379 	struct channel *pch;  in ppp_mp_explode()  local
1393 	list_for_each_entry(pch, &ppp->channels, clist) {  in ppp_mp_explode()
1394 		if (pch->chan) {  in ppp_mp_explode()
1395 			pch->avail = 1;  in ppp_mp_explode()
1397 			pch->speed = pch->chan->speed;  in ppp_mp_explode()
1399 			pch->avail = 0;  in ppp_mp_explode()
1401 		if (pch->avail) {  in ppp_mp_explode()
1402 			if (skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1403 				!pch->had_frag) {  in ppp_mp_explode()
1404 					if (pch->speed == 0)  in ppp_mp_explode()
1407 						totspeed += pch->speed;  in ppp_mp_explode()
1409 					pch->avail = 2;  in ppp_mp_explode()
1413 			if (!pch->had_frag && i < ppp->nxchan)  in ppp_mp_explode()
1456 		pch = list_entry(list, struct channel, clist);  in ppp_mp_explode()
1458 		if (!pch->avail)  in ppp_mp_explode()
1465 		if (pch->avail == 1) {  in ppp_mp_explode()
1469 			pch->avail = 1;  in ppp_mp_explode()
1473 		spin_lock_bh(&pch->downl);  in ppp_mp_explode()
1474 		if (pch->chan == NULL) {  in ppp_mp_explode()
1476 			if (pch->speed == 0)  in ppp_mp_explode()
1479 				totspeed -= pch->speed;  in ppp_mp_explode()
1481 			spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1482 			pch->avail = 0;  in ppp_mp_explode()
1499 			if (pch->speed == 0) {  in ppp_mp_explode()
1507 					((totspeed*totfree)/pch->speed)) - hdrlen;  in ppp_mp_explode()
1509 					flen += ((totfree - nzero)*pch->speed)/totspeed;  in ppp_mp_explode()
1510 					nbigger -= ((totfree - nzero)*pch->speed)/  in ppp_mp_explode()
1531 			pch->avail = 2;  in ppp_mp_explode()
1532 			spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1541 		mtu = pch->chan->mtu - (hdrlen - 2);  in ppp_mp_explode()
1568 		chan = pch->chan;  in ppp_mp_explode()
1569 		if (!skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1571 			skb_queue_tail(&pch->file.xq, frag);  in ppp_mp_explode()
1572 		pch->had_frag = 1;  in ppp_mp_explode()
1577 		spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1584 	spin_unlock_bh(&pch->downl);  in ppp_mp_explode()
1597 ppp_channel_push(struct channel *pch)  in ppp_channel_push()  argument
1602 	spin_lock_bh(&pch->downl);  in ppp_channel_push()
1603 	if (pch->chan) {  in ppp_channel_push()
1604 		while (!skb_queue_empty(&pch->file.xq)) {  in ppp_channel_push()
1605 			skb = skb_dequeue(&pch->file.xq);  in ppp_channel_push()
1606 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {  in ppp_channel_push()
1608 				skb_queue_head(&pch->file.xq, skb);  in ppp_channel_push()
1614 		skb_queue_purge(&pch->file.xq);  in ppp_channel_push()
1616 	spin_unlock_bh(&pch->downl);  in ppp_channel_push()
1618 	if (skb_queue_empty(&pch->file.xq)) {  in ppp_channel_push()
1619 		read_lock_bh(&pch->upl);  in ppp_channel_push()
1620 		ppp = pch->ppp;  in ppp_channel_push()
1623 		read_unlock_bh(&pch->upl);  in ppp_channel_push()
1638 ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_do_recv()  argument
1642 		ppp_receive_frame(ppp, skb, pch);  in ppp_do_recv()
1651 	struct channel *pch = chan->ppp;  in ppp_input()  local
1654 	if (!pch) {  in ppp_input()
1659 	read_lock_bh(&pch->upl);  in ppp_input()
1662 		if (pch->ppp) {  in ppp_input()
1663 			++pch->ppp->dev->stats.rx_length_errors;  in ppp_input()
1664 			ppp_receive_error(pch->ppp);  in ppp_input()
1670 	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {  in ppp_input()
1672 		skb_queue_tail(&pch->file.rq, skb);  in ppp_input()
1674 		while (pch->file.rq.qlen > PPP_MAX_RQLEN &&  in ppp_input()
1675 		       (skb = skb_dequeue(&pch->file.rq)))  in ppp_input()
1677 		wake_up_interruptible(&pch->file.rwait);  in ppp_input()
1679 		ppp_do_recv(pch->ppp, skb, pch);  in ppp_input()
1683 	read_unlock_bh(&pch->upl);  in ppp_input()
1690 	struct channel *pch = chan->ppp;  in ppp_input_error()  local
1693 	if (!pch)  in ppp_input_error()
1696 	read_lock_bh(&pch->upl);  in ppp_input_error()
1697 	if (pch->ppp) {  in ppp_input_error()
1702 			ppp_do_recv(pch->ppp, skb, pch);  in ppp_input_error()
1705 	read_unlock_bh(&pch->upl);  in ppp_input_error()
1713 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_frame()  argument
1721 			ppp_receive_mp_frame(ppp, skb, pch);  in ppp_receive_frame()
1949 ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_mp_frame()  argument
1985 	pch->lastseq = seq;  in ppp_receive_mp_frame()
2236 	struct channel *pch;  in ppp_register_net_channel()  local
2239 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);  in ppp_register_net_channel()
2240 	if (!pch)  in ppp_register_net_channel()
2245 	pch->ppp = NULL;  in ppp_register_net_channel()
2246 	pch->chan = chan;  in ppp_register_net_channel()
2247 	pch->chan_net = net;  in ppp_register_net_channel()
2248 	chan->ppp = pch;  in ppp_register_net_channel()
2249 	init_ppp_file(&pch->file, CHANNEL);  in ppp_register_net_channel()
2250 	pch->file.hdrlen = chan->hdrlen;  in ppp_register_net_channel()
2252 	pch->lastseq = -1;  in ppp_register_net_channel()
2254 	init_rwsem(&pch->chan_sem);  in ppp_register_net_channel()
2255 	spin_lock_init(&pch->downl);  in ppp_register_net_channel()
2256 	rwlock_init(&pch->upl);  in ppp_register_net_channel()
2259 	pch->file.index = ++pn->last_channel_index;  in ppp_register_net_channel()
2260 	list_add(&pch->list, &pn->new_channels);  in ppp_register_net_channel()
2272 	struct channel *pch = chan->ppp;  in ppp_channel_index()  local
2274 	if (pch)  in ppp_channel_index()
2275 		return pch->file.index;  in ppp_channel_index()
2284 	struct channel *pch = chan->ppp;  in ppp_unit_number()  local
2287 	if (pch) {  in ppp_unit_number()
2288 		read_lock_bh(&pch->upl);  in ppp_unit_number()
2289 		if (pch->ppp)  in ppp_unit_number()
2290 			unit = pch->ppp->file.index;  in ppp_unit_number()
2291 		read_unlock_bh(&pch->upl);  in ppp_unit_number()
2301 	struct channel *pch = chan->ppp;  in ppp_dev_name()  local
2304 	if (pch) {  in ppp_dev_name()
2305 		read_lock_bh(&pch->upl);  in ppp_dev_name()
2306 		if (pch->ppp && pch->ppp->dev)  in ppp_dev_name()
2307 			name = pch->ppp->dev->name;  in ppp_dev_name()
2308 		read_unlock_bh(&pch->upl);  in ppp_dev_name()
2321 	struct channel *pch = chan->ppp;  in ppp_unregister_channel()  local
2324 	if (!pch)  in ppp_unregister_channel()
2333 	down_write(&pch->chan_sem);  in ppp_unregister_channel()
2334 	spin_lock_bh(&pch->downl);  in ppp_unregister_channel()
2335 	pch->chan = NULL;  in ppp_unregister_channel()
2336 	spin_unlock_bh(&pch->downl);  in ppp_unregister_channel()
2337 	up_write(&pch->chan_sem);  in ppp_unregister_channel()
2338 	ppp_disconnect_channel(pch);  in ppp_unregister_channel()
2340 	pn = ppp_pernet(pch->chan_net);  in ppp_unregister_channel()
2342 	list_del(&pch->list);  in ppp_unregister_channel()
2345 	pch->file.dead = 1;  in ppp_unregister_channel()
2346 	wake_up_interruptible(&pch->file.rwait);  in ppp_unregister_channel()
2347 	if (atomic_dec_and_test(&pch->file.refcnt))  in ppp_unregister_channel()
2348 		ppp_destroy_channel(pch);  in ppp_unregister_channel()
2358 	struct channel *pch = chan->ppp;  in ppp_output_wakeup()  local
2360 	if (!pch)  in ppp_output_wakeup()
2362 	ppp_channel_push(pch);  in ppp_output_wakeup()
2869 	struct channel *pch;  in ppp_find_channel()  local
2871 	list_for_each_entry(pch, &pn->new_channels, list) {  in ppp_find_channel()
2872 		if (pch->file.index == unit) {  in ppp_find_channel()
2873 			list_move(&pch->list, &pn->all_channels);  in ppp_find_channel()
2874 			return pch;  in ppp_find_channel()
2878 	list_for_each_entry(pch, &pn->all_channels, list) {  in ppp_find_channel()
2879 		if (pch->file.index == unit)  in ppp_find_channel()
2880 			return pch;  in ppp_find_channel()
2890 ppp_connect_channel(struct channel *pch, int unit)  in ppp_connect_channel()  argument
2897 	pn = ppp_pernet(pch->chan_net);  in ppp_connect_channel()
2903 	write_lock_bh(&pch->upl);  in ppp_connect_channel()
2905 	if (pch->ppp)  in ppp_connect_channel()
2909 	if (pch->file.hdrlen > ppp->file.hdrlen)  in ppp_connect_channel()
2910 		ppp->file.hdrlen = pch->file.hdrlen;  in ppp_connect_channel()
2911 	hdrlen = pch->file.hdrlen + 2;	/* for protocol bytes */  in ppp_connect_channel()
2914 	list_add_tail(&pch->clist, &ppp->channels);  in ppp_connect_channel()
2916 	pch->ppp = ppp;  in ppp_connect_channel()
2922 	write_unlock_bh(&pch->upl);  in ppp_connect_channel()
2932 ppp_disconnect_channel(struct channel *pch)  in ppp_disconnect_channel()  argument
2937 	write_lock_bh(&pch->upl);  in ppp_disconnect_channel()
2938 	ppp = pch->ppp;  in ppp_disconnect_channel()
2939 	pch->ppp = NULL;  in ppp_disconnect_channel()
2940 	write_unlock_bh(&pch->upl);  in ppp_disconnect_channel()
2944 		list_del(&pch->clist);  in ppp_disconnect_channel()
2958 static void ppp_destroy_channel(struct channel *pch)  in ppp_destroy_channel()  argument
2962 	if (!pch->file.dead) {  in ppp_destroy_channel()
2964 		pr_err("ppp: destroying undead channel %p !\n", pch);  in ppp_destroy_channel()
2967 	skb_queue_purge(&pch->file.xq);  in ppp_destroy_channel()
2968 	skb_queue_purge(&pch->file.rq);  in ppp_destroy_channel()
2969 	kfree(pch);  in ppp_destroy_channel()