261 static void ppp_channel_push(struct channel *pch);
263 			      struct channel *pch);
270 				struct channel *pch);
285 static int ppp_connect_channel(struct channel *pch, int unit);
286 static int ppp_disconnect_channel(struct channel *pch);
287 static void ppp_destroy_channel(struct channel *pch);
649 		struct channel *pch;  in ppp_ioctl()  local
652 		pch = PF_TO_CHANNEL(pf);  in ppp_ioctl()
658 			err = ppp_connect_channel(pch, unit);  in ppp_ioctl()
662 			err = ppp_disconnect_channel(pch);  in ppp_ioctl()
666 			down_read(&pch->chan_sem);  in ppp_ioctl()
667 			chan = pch->chan;  in ppp_ioctl()
671 			up_read(&pch->chan_sem);  in ppp_ioctl()
1727 	struct channel *pch;  in ppp_push()  local
1744 		pch = list_entry(list, struct channel, clist);  in ppp_push()
1746 		spin_lock(&pch->downl);  in ppp_push()
1747 		if (pch->chan) {  in ppp_push()
1748 			if (pch->chan->ops->start_xmit(pch->chan, skb))  in ppp_push()
1755 		spin_unlock(&pch->downl);  in ppp_push()
1791 	struct channel *pch;  in ppp_mp_explode()  local
1805 	list_for_each_entry(pch, &ppp->channels, clist) {  in ppp_mp_explode()
1806 		if (pch->chan) {  in ppp_mp_explode()
1807 			pch->avail = 1;  in ppp_mp_explode()
1809 			pch->speed = pch->chan->speed;  in ppp_mp_explode()
1811 			pch->avail = 0;  in ppp_mp_explode()
1813 		if (pch->avail) {  in ppp_mp_explode()
1814 			if (skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1815 				!pch->had_frag) {  in ppp_mp_explode()
1816 					if (pch->speed == 0)  in ppp_mp_explode()
1819 						totspeed += pch->speed;  in ppp_mp_explode()
1821 					pch->avail = 2;  in ppp_mp_explode()
1825 			if (!pch->had_frag && i < ppp->nxchan)  in ppp_mp_explode()
1868 		pch = list_entry(list, struct channel, clist);  in ppp_mp_explode()
1870 		if (!pch->avail)  in ppp_mp_explode()
1877 		if (pch->avail == 1) {  in ppp_mp_explode()
1881 			pch->avail = 1;  in ppp_mp_explode()
1885 		spin_lock(&pch->downl);  in ppp_mp_explode()
1886 		if (pch->chan == NULL) {  in ppp_mp_explode()
1888 			if (pch->speed == 0)  in ppp_mp_explode()
1891 				totspeed -= pch->speed;  in ppp_mp_explode()
1893 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1894 			pch->avail = 0;  in ppp_mp_explode()
1911 			if (pch->speed == 0) {  in ppp_mp_explode()
1919 					((totspeed*totfree)/pch->speed)) - hdrlen;  in ppp_mp_explode()
1921 					flen += ((totfree - nzero)*pch->speed)/totspeed;  in ppp_mp_explode()
1922 					nbigger -= ((totfree - nzero)*pch->speed)/  in ppp_mp_explode()
1943 			pch->avail = 2;  in ppp_mp_explode()
1944 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1953 		mtu = pch->chan->mtu - (hdrlen - 2);  in ppp_mp_explode()
1980 		chan = pch->chan;  in ppp_mp_explode()
1981 		if (!skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1983 			skb_queue_tail(&pch->file.xq, frag);  in ppp_mp_explode()
1984 		pch->had_frag = 1;  in ppp_mp_explode()
1989 		spin_unlock(&pch->downl);  in ppp_mp_explode()
1996 	spin_unlock(&pch->downl);  in ppp_mp_explode()
2006 static void __ppp_channel_push(struct channel *pch)  in __ppp_channel_push()  argument
2011 	spin_lock(&pch->downl);  in __ppp_channel_push()
2012 	if (pch->chan) {  in __ppp_channel_push()
2013 		while (!skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
2014 			skb = skb_dequeue(&pch->file.xq);  in __ppp_channel_push()
2015 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {  in __ppp_channel_push()
2017 				skb_queue_head(&pch->file.xq, skb);  in __ppp_channel_push()
2023 		skb_queue_purge(&pch->file.xq);  in __ppp_channel_push()
2025 	spin_unlock(&pch->downl);  in __ppp_channel_push()
2027 	if (skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
2028 		ppp = pch->ppp;  in __ppp_channel_push()
2034 static void ppp_channel_push(struct channel *pch)  in ppp_channel_push()  argument
2036 	read_lock_bh(&pch->upl);  in ppp_channel_push()
2037 	if (pch->ppp) {  in ppp_channel_push()
2038 		(*this_cpu_ptr(pch->ppp->xmit_recursion))++;  in ppp_channel_push()
2039 		__ppp_channel_push(pch);  in ppp_channel_push()
2040 		(*this_cpu_ptr(pch->ppp->xmit_recursion))--;  in ppp_channel_push()
2042 		__ppp_channel_push(pch);  in ppp_channel_push()
2044 	read_unlock_bh(&pch->upl);  in ppp_channel_push()
2058 ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_do_recv()  argument
2062 		ppp_receive_frame(ppp, skb, pch);  in ppp_do_recv()
2111 	struct channel *pch = chan->ppp;  in ppp_input()  local
2114 	if (!pch) {  in ppp_input()
2119 	read_lock_bh(&pch->upl);  in ppp_input()
2122 		if (pch->ppp) {  in ppp_input()
2123 			++pch->ppp->dev->stats.rx_length_errors;  in ppp_input()
2124 			ppp_receive_error(pch->ppp);  in ppp_input()
2130 	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {  in ppp_input()
2132 		skb_queue_tail(&pch->file.rq, skb);  in ppp_input()
2134 		while (pch->file.rq.qlen > PPP_MAX_RQLEN &&  in ppp_input()
2135 		       (skb = skb_dequeue(&pch->file.rq)))  in ppp_input()
2137 		wake_up_interruptible(&pch->file.rwait);  in ppp_input()
2139 		ppp_do_recv(pch->ppp, skb, pch);  in ppp_input()
2143 	read_unlock_bh(&pch->upl);  in ppp_input()
2150 	struct channel *pch = chan->ppp;  in ppp_input_error()  local
2153 	if (!pch)  in ppp_input_error()
2156 	read_lock_bh(&pch->upl);  in ppp_input_error()
2157 	if (pch->ppp) {  in ppp_input_error()
2162 			ppp_do_recv(pch->ppp, skb, pch);  in ppp_input_error()
2165 	read_unlock_bh(&pch->upl);  in ppp_input_error()
2173 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_frame()  argument
2181 			ppp_receive_mp_frame(ppp, skb, pch);  in ppp_receive_frame()
2417 ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_mp_frame()  argument
2455 	pch->lastseq = seq;  in ppp_receive_mp_frame()
2706 	struct channel *pch;  in ppp_register_net_channel()  local
2709 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);  in ppp_register_net_channel()
2710 	if (!pch)  in ppp_register_net_channel()
2715 	pch->ppp = NULL;  in ppp_register_net_channel()
2716 	pch->chan = chan;  in ppp_register_net_channel()
2717 	pch->chan_net = get_net(net);  in ppp_register_net_channel()
2718 	chan->ppp = pch;  in ppp_register_net_channel()
2719 	init_ppp_file(&pch->file, CHANNEL);  in ppp_register_net_channel()
2720 	pch->file.hdrlen = chan->hdrlen;  in ppp_register_net_channel()
2722 	pch->lastseq = -1;  in ppp_register_net_channel()
2724 	init_rwsem(&pch->chan_sem);  in ppp_register_net_channel()
2725 	spin_lock_init(&pch->downl);  in ppp_register_net_channel()
2726 	rwlock_init(&pch->upl);  in ppp_register_net_channel()
2729 	pch->file.index = ++pn->last_channel_index;  in ppp_register_net_channel()
2730 	list_add(&pch->list, &pn->new_channels);  in ppp_register_net_channel()
2742 	struct channel *pch = chan->ppp;  in ppp_channel_index()  local
2744 	if (pch)  in ppp_channel_index()
2745 		return pch->file.index;  in ppp_channel_index()
2754 	struct channel *pch = chan->ppp;  in ppp_unit_number()  local
2757 	if (pch) {  in ppp_unit_number()
2758 		read_lock_bh(&pch->upl);  in ppp_unit_number()
2759 		if (pch->ppp)  in ppp_unit_number()
2760 			unit = pch->ppp->file.index;  in ppp_unit_number()
2761 		read_unlock_bh(&pch->upl);  in ppp_unit_number()
2771 	struct channel *pch = chan->ppp;  in ppp_dev_name()  local
2774 	if (pch) {  in ppp_dev_name()
2775 		read_lock_bh(&pch->upl);  in ppp_dev_name()
2776 		if (pch->ppp && pch->ppp->dev)  in ppp_dev_name()
2777 			name = pch->ppp->dev->name;  in ppp_dev_name()
2778 		read_unlock_bh(&pch->upl);  in ppp_dev_name()
2791 	struct channel *pch = chan->ppp;  in ppp_unregister_channel()  local
2794 	if (!pch)  in ppp_unregister_channel()
2803 	down_write(&pch->chan_sem);  in ppp_unregister_channel()
2804 	spin_lock_bh(&pch->downl);  in ppp_unregister_channel()
2805 	pch->chan = NULL;  in ppp_unregister_channel()
2806 	spin_unlock_bh(&pch->downl);  in ppp_unregister_channel()
2807 	up_write(&pch->chan_sem);  in ppp_unregister_channel()
2808 	ppp_disconnect_channel(pch);  in ppp_unregister_channel()
2810 	pn = ppp_pernet(pch->chan_net);  in ppp_unregister_channel()
2812 	list_del(&pch->list);  in ppp_unregister_channel()
2815 	pch->file.dead = 1;  in ppp_unregister_channel()
2816 	wake_up_interruptible(&pch->file.rwait);  in ppp_unregister_channel()
2817 	if (refcount_dec_and_test(&pch->file.refcnt))  in ppp_unregister_channel()
2818 		ppp_destroy_channel(pch);  in ppp_unregister_channel()
2828 	struct channel *pch = chan->ppp;  in ppp_output_wakeup()  local
2830 	if (!pch)  in ppp_output_wakeup()
2832 	ppp_channel_push(pch);  in ppp_output_wakeup()
3253 	struct channel *pch;  in ppp_find_channel()  local
3255 	list_for_each_entry(pch, &pn->new_channels, list) {  in ppp_find_channel()
3256 		if (pch->file.index == unit) {  in ppp_find_channel()
3257 			list_move(&pch->list, &pn->all_channels);  in ppp_find_channel()
3258 			return pch;  in ppp_find_channel()
3262 	list_for_each_entry(pch, &pn->all_channels, list) {  in ppp_find_channel()
3263 		if (pch->file.index == unit)  in ppp_find_channel()
3264 			return pch;  in ppp_find_channel()
3274 ppp_connect_channel(struct channel *pch, int unit)  in ppp_connect_channel()  argument
3281 	pn = ppp_pernet(pch->chan_net);  in ppp_connect_channel()
3287 	write_lock_bh(&pch->upl);  in ppp_connect_channel()
3289 	if (pch->ppp)  in ppp_connect_channel()
3293 	spin_lock_bh(&pch->downl);  in ppp_connect_channel()
3294 	if (!pch->chan) {  in ppp_connect_channel()
3296 		spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3301 	spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3302 	if (pch->file.hdrlen > ppp->file.hdrlen)  in ppp_connect_channel()
3303 		ppp->file.hdrlen = pch->file.hdrlen;  in ppp_connect_channel()
3304 	hdrlen = pch->file.hdrlen + 2;	/* for protocol bytes */  in ppp_connect_channel()
3307 	list_add_tail(&pch->clist, &ppp->channels);  in ppp_connect_channel()
3309 	pch->ppp = ppp;  in ppp_connect_channel()
3315 	write_unlock_bh(&pch->upl);  in ppp_connect_channel()
3325 ppp_disconnect_channel(struct channel *pch)  in ppp_disconnect_channel()  argument
3330 	write_lock_bh(&pch->upl);  in ppp_disconnect_channel()
3331 	ppp = pch->ppp;  in ppp_disconnect_channel()
3332 	pch->ppp = NULL;  in ppp_disconnect_channel()
3333 	write_unlock_bh(&pch->upl);  in ppp_disconnect_channel()
3337 		list_del(&pch->clist);  in ppp_disconnect_channel()
3351 static void ppp_destroy_channel(struct channel *pch)  in ppp_destroy_channel()  argument
3353 	put_net(pch->chan_net);  in ppp_destroy_channel()
3354 	pch->chan_net = NULL;  in ppp_destroy_channel()
3358 	if (!pch->file.dead) {  in ppp_destroy_channel()
3360 		pr_err("ppp: destroying undead channel %p !\n", pch);  in ppp_destroy_channel()
3363 	skb_queue_purge(&pch->file.xq);  in ppp_destroy_channel()
3364 	skb_queue_purge(&pch->file.rq);  in ppp_destroy_channel()
3365 	kfree(pch);  in ppp_destroy_channel()