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);
644 		struct channel *pch;  in ppp_ioctl()  local
647 		pch = PF_TO_CHANNEL(pf);  in ppp_ioctl()
653 			err = ppp_connect_channel(pch, unit);  in ppp_ioctl()
657 			err = ppp_disconnect_channel(pch);  in ppp_ioctl()
661 			down_read(&pch->chan_sem);  in ppp_ioctl()
662 			chan = pch->chan;  in ppp_ioctl()
666 			up_read(&pch->chan_sem);  in ppp_ioctl()
1711 	struct channel *pch;  in ppp_push()  local
1728 		pch = list_entry(list, struct channel, clist);  in ppp_push()
1730 		spin_lock(&pch->downl);  in ppp_push()
1731 		if (pch->chan) {  in ppp_push()
1732 			if (pch->chan->ops->start_xmit(pch->chan, skb))  in ppp_push()
1739 		spin_unlock(&pch->downl);  in ppp_push()
1775 	struct channel *pch;  in ppp_mp_explode()  local
1789 	list_for_each_entry(pch, &ppp->channels, clist) {  in ppp_mp_explode()
1790 		if (pch->chan) {  in ppp_mp_explode()
1791 			pch->avail = 1;  in ppp_mp_explode()
1793 			pch->speed = pch->chan->speed;  in ppp_mp_explode()
1795 			pch->avail = 0;  in ppp_mp_explode()
1797 		if (pch->avail) {  in ppp_mp_explode()
1798 			if (skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1799 				!pch->had_frag) {  in ppp_mp_explode()
1800 					if (pch->speed == 0)  in ppp_mp_explode()
1803 						totspeed += pch->speed;  in ppp_mp_explode()
1805 					pch->avail = 2;  in ppp_mp_explode()
1809 			if (!pch->had_frag && i < ppp->nxchan)  in ppp_mp_explode()
1852 		pch = list_entry(list, struct channel, clist);  in ppp_mp_explode()
1854 		if (!pch->avail)  in ppp_mp_explode()
1861 		if (pch->avail == 1) {  in ppp_mp_explode()
1865 			pch->avail = 1;  in ppp_mp_explode()
1869 		spin_lock(&pch->downl);  in ppp_mp_explode()
1870 		if (pch->chan == NULL) {  in ppp_mp_explode()
1872 			if (pch->speed == 0)  in ppp_mp_explode()
1875 				totspeed -= pch->speed;  in ppp_mp_explode()
1877 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1878 			pch->avail = 0;  in ppp_mp_explode()
1895 			if (pch->speed == 0) {  in ppp_mp_explode()
1903 					((totspeed*totfree)/pch->speed)) - hdrlen;  in ppp_mp_explode()
1905 					flen += ((totfree - nzero)*pch->speed)/totspeed;  in ppp_mp_explode()
1906 					nbigger -= ((totfree - nzero)*pch->speed)/  in ppp_mp_explode()
1927 			pch->avail = 2;  in ppp_mp_explode()
1928 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1937 		mtu = pch->chan->mtu - (hdrlen - 2);  in ppp_mp_explode()
1964 		chan = pch->chan;  in ppp_mp_explode()
1965 		if (!skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1967 			skb_queue_tail(&pch->file.xq, frag);  in ppp_mp_explode()
1968 		pch->had_frag = 1;  in ppp_mp_explode()
1973 		spin_unlock(&pch->downl);  in ppp_mp_explode()
1980 	spin_unlock(&pch->downl);  in ppp_mp_explode()
1990 static void __ppp_channel_push(struct channel *pch)  in __ppp_channel_push()  argument
1995 	spin_lock(&pch->downl);  in __ppp_channel_push()
1996 	if (pch->chan) {  in __ppp_channel_push()
1997 		while (!skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
1998 			skb = skb_dequeue(&pch->file.xq);  in __ppp_channel_push()
1999 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {  in __ppp_channel_push()
2001 				skb_queue_head(&pch->file.xq, skb);  in __ppp_channel_push()
2007 		skb_queue_purge(&pch->file.xq);  in __ppp_channel_push()
2009 	spin_unlock(&pch->downl);  in __ppp_channel_push()
2011 	if (skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
2012 		ppp = pch->ppp;  in __ppp_channel_push()
2018 static void ppp_channel_push(struct channel *pch)  in ppp_channel_push()  argument
2020 	read_lock_bh(&pch->upl);  in ppp_channel_push()
2021 	if (pch->ppp) {  in ppp_channel_push()
2022 		(*this_cpu_ptr(pch->ppp->xmit_recursion))++;  in ppp_channel_push()
2023 		__ppp_channel_push(pch);  in ppp_channel_push()
2024 		(*this_cpu_ptr(pch->ppp->xmit_recursion))--;  in ppp_channel_push()
2026 		__ppp_channel_push(pch);  in ppp_channel_push()
2028 	read_unlock_bh(&pch->upl);  in ppp_channel_push()
2042 ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_do_recv()  argument
2046 		ppp_receive_frame(ppp, skb, pch);  in ppp_do_recv()
2095 	struct channel *pch = chan->ppp;  in ppp_input()  local
2098 	if (!pch) {  in ppp_input()
2103 	read_lock_bh(&pch->upl);  in ppp_input()
2106 		if (pch->ppp) {  in ppp_input()
2107 			++pch->ppp->dev->stats.rx_length_errors;  in ppp_input()
2108 			ppp_receive_error(pch->ppp);  in ppp_input()
2114 	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {  in ppp_input()
2116 		skb_queue_tail(&pch->file.rq, skb);  in ppp_input()
2118 		while (pch->file.rq.qlen > PPP_MAX_RQLEN &&  in ppp_input()
2119 		       (skb = skb_dequeue(&pch->file.rq)))  in ppp_input()
2121 		wake_up_interruptible(&pch->file.rwait);  in ppp_input()
2123 		ppp_do_recv(pch->ppp, skb, pch);  in ppp_input()
2127 	read_unlock_bh(&pch->upl);  in ppp_input()
2134 	struct channel *pch = chan->ppp;  in ppp_input_error()  local
2137 	if (!pch)  in ppp_input_error()
2140 	read_lock_bh(&pch->upl);  in ppp_input_error()
2141 	if (pch->ppp) {  in ppp_input_error()
2146 			ppp_do_recv(pch->ppp, skb, pch);  in ppp_input_error()
2149 	read_unlock_bh(&pch->upl);  in ppp_input_error()
2157 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_frame()  argument
2165 			ppp_receive_mp_frame(ppp, skb, pch);  in ppp_receive_frame()
2401 ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_mp_frame()  argument
2439 	pch->lastseq = seq;  in ppp_receive_mp_frame()
2690 	struct channel *pch;  in ppp_register_net_channel()  local
2693 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);  in ppp_register_net_channel()
2694 	if (!pch)  in ppp_register_net_channel()
2699 	pch->ppp = NULL;  in ppp_register_net_channel()
2700 	pch->chan = chan;  in ppp_register_net_channel()
2701 	pch->chan_net = get_net(net);  in ppp_register_net_channel()
2702 	chan->ppp = pch;  in ppp_register_net_channel()
2703 	init_ppp_file(&pch->file, CHANNEL);  in ppp_register_net_channel()
2704 	pch->file.hdrlen = chan->hdrlen;  in ppp_register_net_channel()
2706 	pch->lastseq = -1;  in ppp_register_net_channel()
2708 	init_rwsem(&pch->chan_sem);  in ppp_register_net_channel()
2709 	spin_lock_init(&pch->downl);  in ppp_register_net_channel()
2710 	rwlock_init(&pch->upl);  in ppp_register_net_channel()
2713 	pch->file.index = ++pn->last_channel_index;  in ppp_register_net_channel()
2714 	list_add(&pch->list, &pn->new_channels);  in ppp_register_net_channel()
2726 	struct channel *pch = chan->ppp;  in ppp_channel_index()  local
2728 	if (pch)  in ppp_channel_index()
2729 		return pch->file.index;  in ppp_channel_index()
2738 	struct channel *pch = chan->ppp;  in ppp_unit_number()  local
2741 	if (pch) {  in ppp_unit_number()
2742 		read_lock_bh(&pch->upl);  in ppp_unit_number()
2743 		if (pch->ppp)  in ppp_unit_number()
2744 			unit = pch->ppp->file.index;  in ppp_unit_number()
2745 		read_unlock_bh(&pch->upl);  in ppp_unit_number()
2755 	struct channel *pch = chan->ppp;  in ppp_dev_name()  local
2758 	if (pch) {  in ppp_dev_name()
2759 		read_lock_bh(&pch->upl);  in ppp_dev_name()
2760 		if (pch->ppp && pch->ppp->dev)  in ppp_dev_name()
2761 			name = pch->ppp->dev->name;  in ppp_dev_name()
2762 		read_unlock_bh(&pch->upl);  in ppp_dev_name()
2775 	struct channel *pch = chan->ppp;  in ppp_unregister_channel()  local
2778 	if (!pch)  in ppp_unregister_channel()
2787 	down_write(&pch->chan_sem);  in ppp_unregister_channel()
2788 	spin_lock_bh(&pch->downl);  in ppp_unregister_channel()
2789 	pch->chan = NULL;  in ppp_unregister_channel()
2790 	spin_unlock_bh(&pch->downl);  in ppp_unregister_channel()
2791 	up_write(&pch->chan_sem);  in ppp_unregister_channel()
2792 	ppp_disconnect_channel(pch);  in ppp_unregister_channel()
2794 	pn = ppp_pernet(pch->chan_net);  in ppp_unregister_channel()
2796 	list_del(&pch->list);  in ppp_unregister_channel()
2799 	pch->file.dead = 1;  in ppp_unregister_channel()
2800 	wake_up_interruptible(&pch->file.rwait);  in ppp_unregister_channel()
2801 	if (refcount_dec_and_test(&pch->file.refcnt))  in ppp_unregister_channel()
2802 		ppp_destroy_channel(pch);  in ppp_unregister_channel()
2812 	struct channel *pch = chan->ppp;  in ppp_output_wakeup()  local
2814 	if (!pch)  in ppp_output_wakeup()
2816 	ppp_channel_push(pch);  in ppp_output_wakeup()
3237 	struct channel *pch;  in ppp_find_channel()  local
3239 	list_for_each_entry(pch, &pn->new_channels, list) {  in ppp_find_channel()
3240 		if (pch->file.index == unit) {  in ppp_find_channel()
3241 			list_move(&pch->list, &pn->all_channels);  in ppp_find_channel()
3242 			return pch;  in ppp_find_channel()
3246 	list_for_each_entry(pch, &pn->all_channels, list) {  in ppp_find_channel()
3247 		if (pch->file.index == unit)  in ppp_find_channel()
3248 			return pch;  in ppp_find_channel()
3258 ppp_connect_channel(struct channel *pch, int unit)  in ppp_connect_channel()  argument
3265 	pn = ppp_pernet(pch->chan_net);  in ppp_connect_channel()
3271 	write_lock_bh(&pch->upl);  in ppp_connect_channel()
3273 	if (pch->ppp)  in ppp_connect_channel()
3277 	spin_lock_bh(&pch->downl);  in ppp_connect_channel()
3278 	if (!pch->chan) {  in ppp_connect_channel()
3280 		spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3285 	spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3286 	if (pch->file.hdrlen > ppp->file.hdrlen)  in ppp_connect_channel()
3287 		ppp->file.hdrlen = pch->file.hdrlen;  in ppp_connect_channel()
3288 	hdrlen = pch->file.hdrlen + 2;	/* for protocol bytes */  in ppp_connect_channel()
3291 	list_add_tail(&pch->clist, &ppp->channels);  in ppp_connect_channel()
3293 	pch->ppp = ppp;  in ppp_connect_channel()
3299 	write_unlock_bh(&pch->upl);  in ppp_connect_channel()
3309 ppp_disconnect_channel(struct channel *pch)  in ppp_disconnect_channel()  argument
3314 	write_lock_bh(&pch->upl);  in ppp_disconnect_channel()
3315 	ppp = pch->ppp;  in ppp_disconnect_channel()
3316 	pch->ppp = NULL;  in ppp_disconnect_channel()
3317 	write_unlock_bh(&pch->upl);  in ppp_disconnect_channel()
3321 		list_del(&pch->clist);  in ppp_disconnect_channel()
3335 static void ppp_destroy_channel(struct channel *pch)  in ppp_destroy_channel()  argument
3337 	put_net(pch->chan_net);  in ppp_destroy_channel()
3338 	pch->chan_net = NULL;  in ppp_destroy_channel()
3342 	if (!pch->file.dead) {  in ppp_destroy_channel()
3344 		pr_err("ppp: destroying undead channel %p !\n", pch);  in ppp_destroy_channel()
3347 	skb_queue_purge(&pch->file.xq);  in ppp_destroy_channel()
3348 	skb_queue_purge(&pch->file.rq);  in ppp_destroy_channel()
3349 	kfree(pch);  in ppp_destroy_channel()