259 static void ppp_channel_push(struct channel *pch);
261 			      struct channel *pch);
268 				struct channel *pch);
283 static int ppp_connect_channel(struct channel *pch, int unit);
284 static int ppp_disconnect_channel(struct channel *pch);
285 static void ppp_destroy_channel(struct channel *pch);
615 		struct channel *pch;  in ppp_ioctl()  local
618 		pch = PF_TO_CHANNEL(pf);  in ppp_ioctl()
624 			err = ppp_connect_channel(pch, unit);  in ppp_ioctl()
628 			err = ppp_disconnect_channel(pch);  in ppp_ioctl()
632 			down_read(&pch->chan_sem);  in ppp_ioctl()
633 			chan = pch->chan;  in ppp_ioctl()
637 			up_read(&pch->chan_sem);  in ppp_ioctl()
1623 	struct channel *pch;  in ppp_push()  local
1640 		pch = list_entry(list, struct channel, clist);  in ppp_push()
1642 		spin_lock(&pch->downl);  in ppp_push()
1643 		if (pch->chan) {  in ppp_push()
1644 			if (pch->chan->ops->start_xmit(pch->chan, skb))  in ppp_push()
1651 		spin_unlock(&pch->downl);  in ppp_push()
1687 	struct channel *pch;  in ppp_mp_explode()  local
1701 	list_for_each_entry(pch, &ppp->channels, clist) {  in ppp_mp_explode()
1702 		if (pch->chan) {  in ppp_mp_explode()
1703 			pch->avail = 1;  in ppp_mp_explode()
1705 			pch->speed = pch->chan->speed;  in ppp_mp_explode()
1707 			pch->avail = 0;  in ppp_mp_explode()
1709 		if (pch->avail) {  in ppp_mp_explode()
1710 			if (skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1711 				!pch->had_frag) {  in ppp_mp_explode()
1712 					if (pch->speed == 0)  in ppp_mp_explode()
1715 						totspeed += pch->speed;  in ppp_mp_explode()
1717 					pch->avail = 2;  in ppp_mp_explode()
1721 			if (!pch->had_frag && i < ppp->nxchan)  in ppp_mp_explode()
1764 		pch = list_entry(list, struct channel, clist);  in ppp_mp_explode()
1766 		if (!pch->avail)  in ppp_mp_explode()
1773 		if (pch->avail == 1) {  in ppp_mp_explode()
1777 			pch->avail = 1;  in ppp_mp_explode()
1781 		spin_lock(&pch->downl);  in ppp_mp_explode()
1782 		if (pch->chan == NULL) {  in ppp_mp_explode()
1784 			if (pch->speed == 0)  in ppp_mp_explode()
1787 				totspeed -= pch->speed;  in ppp_mp_explode()
1789 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1790 			pch->avail = 0;  in ppp_mp_explode()
1807 			if (pch->speed == 0) {  in ppp_mp_explode()
1815 					((totspeed*totfree)/pch->speed)) - hdrlen;  in ppp_mp_explode()
1817 					flen += ((totfree - nzero)*pch->speed)/totspeed;  in ppp_mp_explode()
1818 					nbigger -= ((totfree - nzero)*pch->speed)/  in ppp_mp_explode()
1839 			pch->avail = 2;  in ppp_mp_explode()
1840 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1849 		mtu = pch->chan->mtu - (hdrlen - 2);  in ppp_mp_explode()
1876 		chan = pch->chan;  in ppp_mp_explode()
1877 		if (!skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1879 			skb_queue_tail(&pch->file.xq, frag);  in ppp_mp_explode()
1880 		pch->had_frag = 1;  in ppp_mp_explode()
1885 		spin_unlock(&pch->downl);  in ppp_mp_explode()
1892 	spin_unlock(&pch->downl);  in ppp_mp_explode()
1902 static void __ppp_channel_push(struct channel *pch)  in __ppp_channel_push()  argument
1907 	spin_lock(&pch->downl);  in __ppp_channel_push()
1908 	if (pch->chan) {  in __ppp_channel_push()
1909 		while (!skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
1910 			skb = skb_dequeue(&pch->file.xq);  in __ppp_channel_push()
1911 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {  in __ppp_channel_push()
1913 				skb_queue_head(&pch->file.xq, skb);  in __ppp_channel_push()
1919 		skb_queue_purge(&pch->file.xq);  in __ppp_channel_push()
1921 	spin_unlock(&pch->downl);  in __ppp_channel_push()
1923 	if (skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
1924 		ppp = pch->ppp;  in __ppp_channel_push()
1930 static void ppp_channel_push(struct channel *pch)  in ppp_channel_push()  argument
1932 	read_lock_bh(&pch->upl);  in ppp_channel_push()
1933 	if (pch->ppp) {  in ppp_channel_push()
1934 		(*this_cpu_ptr(pch->ppp->xmit_recursion))++;  in ppp_channel_push()
1935 		__ppp_channel_push(pch);  in ppp_channel_push()
1936 		(*this_cpu_ptr(pch->ppp->xmit_recursion))--;  in ppp_channel_push()
1938 		__ppp_channel_push(pch);  in ppp_channel_push()
1940 	read_unlock_bh(&pch->upl);  in ppp_channel_push()
1954 ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_do_recv()  argument
1958 		ppp_receive_frame(ppp, skb, pch);  in ppp_do_recv()
2007 	struct channel *pch = chan->ppp;  in ppp_input()  local
2010 	if (!pch) {  in ppp_input()
2015 	read_lock_bh(&pch->upl);  in ppp_input()
2018 		if (pch->ppp) {  in ppp_input()
2019 			++pch->ppp->dev->stats.rx_length_errors;  in ppp_input()
2020 			ppp_receive_error(pch->ppp);  in ppp_input()
2026 	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {  in ppp_input()
2028 		skb_queue_tail(&pch->file.rq, skb);  in ppp_input()
2030 		while (pch->file.rq.qlen > PPP_MAX_RQLEN &&  in ppp_input()
2031 		       (skb = skb_dequeue(&pch->file.rq)))  in ppp_input()
2033 		wake_up_interruptible(&pch->file.rwait);  in ppp_input()
2035 		ppp_do_recv(pch->ppp, skb, pch);  in ppp_input()
2039 	read_unlock_bh(&pch->upl);  in ppp_input()
2046 	struct channel *pch = chan->ppp;  in ppp_input_error()  local
2049 	if (!pch)  in ppp_input_error()
2052 	read_lock_bh(&pch->upl);  in ppp_input_error()
2053 	if (pch->ppp) {  in ppp_input_error()
2058 			ppp_do_recv(pch->ppp, skb, pch);  in ppp_input_error()
2061 	read_unlock_bh(&pch->upl);  in ppp_input_error()
2069 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_frame()  argument
2077 			ppp_receive_mp_frame(ppp, skb, pch);  in ppp_receive_frame()
2313 ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_mp_frame()  argument
2351 	pch->lastseq = seq;  in ppp_receive_mp_frame()
2602 	struct channel *pch;  in ppp_register_net_channel()  local
2605 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);  in ppp_register_net_channel()
2606 	if (!pch)  in ppp_register_net_channel()
2611 	pch->ppp = NULL;  in ppp_register_net_channel()
2612 	pch->chan = chan;  in ppp_register_net_channel()
2613 	pch->chan_net = get_net(net);  in ppp_register_net_channel()
2614 	chan->ppp = pch;  in ppp_register_net_channel()
2615 	init_ppp_file(&pch->file, CHANNEL);  in ppp_register_net_channel()
2616 	pch->file.hdrlen = chan->hdrlen;  in ppp_register_net_channel()
2618 	pch->lastseq = -1;  in ppp_register_net_channel()
2620 	init_rwsem(&pch->chan_sem);  in ppp_register_net_channel()
2621 	spin_lock_init(&pch->downl);  in ppp_register_net_channel()
2622 	rwlock_init(&pch->upl);  in ppp_register_net_channel()
2625 	pch->file.index = ++pn->last_channel_index;  in ppp_register_net_channel()
2626 	list_add(&pch->list, &pn->new_channels);  in ppp_register_net_channel()
2638 	struct channel *pch = chan->ppp;  in ppp_channel_index()  local
2640 	if (pch)  in ppp_channel_index()
2641 		return pch->file.index;  in ppp_channel_index()
2650 	struct channel *pch = chan->ppp;  in ppp_unit_number()  local
2653 	if (pch) {  in ppp_unit_number()
2654 		read_lock_bh(&pch->upl);  in ppp_unit_number()
2655 		if (pch->ppp)  in ppp_unit_number()
2656 			unit = pch->ppp->file.index;  in ppp_unit_number()
2657 		read_unlock_bh(&pch->upl);  in ppp_unit_number()
2667 	struct channel *pch = chan->ppp;  in ppp_dev_name()  local
2670 	if (pch) {  in ppp_dev_name()
2671 		read_lock_bh(&pch->upl);  in ppp_dev_name()
2672 		if (pch->ppp && pch->ppp->dev)  in ppp_dev_name()
2673 			name = pch->ppp->dev->name;  in ppp_dev_name()
2674 		read_unlock_bh(&pch->upl);  in ppp_dev_name()
2687 	struct channel *pch = chan->ppp;  in ppp_unregister_channel()  local
2690 	if (!pch)  in ppp_unregister_channel()
2699 	down_write(&pch->chan_sem);  in ppp_unregister_channel()
2700 	spin_lock_bh(&pch->downl);  in ppp_unregister_channel()
2701 	pch->chan = NULL;  in ppp_unregister_channel()
2702 	spin_unlock_bh(&pch->downl);  in ppp_unregister_channel()
2703 	up_write(&pch->chan_sem);  in ppp_unregister_channel()
2704 	ppp_disconnect_channel(pch);  in ppp_unregister_channel()
2706 	pn = ppp_pernet(pch->chan_net);  in ppp_unregister_channel()
2708 	list_del(&pch->list);  in ppp_unregister_channel()
2711 	pch->file.dead = 1;  in ppp_unregister_channel()
2712 	wake_up_interruptible(&pch->file.rwait);  in ppp_unregister_channel()
2713 	if (refcount_dec_and_test(&pch->file.refcnt))  in ppp_unregister_channel()
2714 		ppp_destroy_channel(pch);  in ppp_unregister_channel()
2724 	struct channel *pch = chan->ppp;  in ppp_output_wakeup()  local
2726 	if (!pch)  in ppp_output_wakeup()
2728 	ppp_channel_push(pch);  in ppp_output_wakeup()
3153 	struct channel *pch;  in ppp_find_channel()  local
3155 	list_for_each_entry(pch, &pn->new_channels, list) {  in ppp_find_channel()
3156 		if (pch->file.index == unit) {  in ppp_find_channel()
3157 			list_move(&pch->list, &pn->all_channels);  in ppp_find_channel()
3158 			return pch;  in ppp_find_channel()
3162 	list_for_each_entry(pch, &pn->all_channels, list) {  in ppp_find_channel()
3163 		if (pch->file.index == unit)  in ppp_find_channel()
3164 			return pch;  in ppp_find_channel()
3174 ppp_connect_channel(struct channel *pch, int unit)  in ppp_connect_channel()  argument
3181 	pn = ppp_pernet(pch->chan_net);  in ppp_connect_channel()
3187 	write_lock_bh(&pch->upl);  in ppp_connect_channel()
3189 	if (pch->ppp)  in ppp_connect_channel()
3193 	spin_lock_bh(&pch->downl);  in ppp_connect_channel()
3194 	if (!pch->chan) {  in ppp_connect_channel()
3196 		spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3201 	spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3202 	if (pch->file.hdrlen > ppp->file.hdrlen)  in ppp_connect_channel()
3203 		ppp->file.hdrlen = pch->file.hdrlen;  in ppp_connect_channel()
3204 	hdrlen = pch->file.hdrlen + 2;	/* for protocol bytes */  in ppp_connect_channel()
3207 	list_add_tail(&pch->clist, &ppp->channels);  in ppp_connect_channel()
3209 	pch->ppp = ppp;  in ppp_connect_channel()
3215 	write_unlock_bh(&pch->upl);  in ppp_connect_channel()
3225 ppp_disconnect_channel(struct channel *pch)  in ppp_disconnect_channel()  argument
3230 	write_lock_bh(&pch->upl);  in ppp_disconnect_channel()
3231 	ppp = pch->ppp;  in ppp_disconnect_channel()
3232 	pch->ppp = NULL;  in ppp_disconnect_channel()
3233 	write_unlock_bh(&pch->upl);  in ppp_disconnect_channel()
3237 		list_del(&pch->clist);  in ppp_disconnect_channel()
3251 static void ppp_destroy_channel(struct channel *pch)  in ppp_destroy_channel()  argument
3253 	put_net(pch->chan_net);  in ppp_destroy_channel()
3254 	pch->chan_net = NULL;  in ppp_destroy_channel()
3258 	if (!pch->file.dead) {  in ppp_destroy_channel()
3260 		pr_err("ppp: destroying undead channel %p !\n", pch);  in ppp_destroy_channel()
3263 	skb_queue_purge(&pch->file.xq);  in ppp_destroy_channel()
3264 	skb_queue_purge(&pch->file.rq);  in ppp_destroy_channel()
3265 	kfree(pch);  in ppp_destroy_channel()