263 static void ppp_channel_push(struct channel *pch);
265 			      struct channel *pch);
272 				struct channel *pch);
287 static int ppp_connect_channel(struct channel *pch, int unit);
288 static int ppp_disconnect_channel(struct channel *pch);
289 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()
1627 	struct channel *pch;  in ppp_push()  local
1644 		pch = list_entry(list, struct channel, clist);  in ppp_push()
1646 		spin_lock(&pch->downl);  in ppp_push()
1647 		if (pch->chan) {  in ppp_push()
1648 			if (pch->chan->ops->start_xmit(pch->chan, skb))  in ppp_push()
1655 		spin_unlock(&pch->downl);  in ppp_push()
1691 	struct channel *pch;  in ppp_mp_explode()  local
1705 	list_for_each_entry(pch, &ppp->channels, clist) {  in ppp_mp_explode()
1706 		if (pch->chan) {  in ppp_mp_explode()
1707 			pch->avail = 1;  in ppp_mp_explode()
1709 			pch->speed = pch->chan->speed;  in ppp_mp_explode()
1711 			pch->avail = 0;  in ppp_mp_explode()
1713 		if (pch->avail) {  in ppp_mp_explode()
1714 			if (skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1715 				!pch->had_frag) {  in ppp_mp_explode()
1716 					if (pch->speed == 0)  in ppp_mp_explode()
1719 						totspeed += pch->speed;  in ppp_mp_explode()
1721 					pch->avail = 2;  in ppp_mp_explode()
1725 			if (!pch->had_frag && i < ppp->nxchan)  in ppp_mp_explode()
1768 		pch = list_entry(list, struct channel, clist);  in ppp_mp_explode()
1770 		if (!pch->avail)  in ppp_mp_explode()
1777 		if (pch->avail == 1) {  in ppp_mp_explode()
1781 			pch->avail = 1;  in ppp_mp_explode()
1785 		spin_lock(&pch->downl);  in ppp_mp_explode()
1786 		if (pch->chan == NULL) {  in ppp_mp_explode()
1788 			if (pch->speed == 0)  in ppp_mp_explode()
1791 				totspeed -= pch->speed;  in ppp_mp_explode()
1793 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1794 			pch->avail = 0;  in ppp_mp_explode()
1811 			if (pch->speed == 0) {  in ppp_mp_explode()
1819 					((totspeed*totfree)/pch->speed)) - hdrlen;  in ppp_mp_explode()
1821 					flen += ((totfree - nzero)*pch->speed)/totspeed;  in ppp_mp_explode()
1822 					nbigger -= ((totfree - nzero)*pch->speed)/  in ppp_mp_explode()
1843 			pch->avail = 2;  in ppp_mp_explode()
1844 			spin_unlock(&pch->downl);  in ppp_mp_explode()
1853 		mtu = pch->chan->mtu - (hdrlen - 2);  in ppp_mp_explode()
1880 		chan = pch->chan;  in ppp_mp_explode()
1881 		if (!skb_queue_empty(&pch->file.xq) ||  in ppp_mp_explode()
1883 			skb_queue_tail(&pch->file.xq, frag);  in ppp_mp_explode()
1884 		pch->had_frag = 1;  in ppp_mp_explode()
1889 		spin_unlock(&pch->downl);  in ppp_mp_explode()
1896 	spin_unlock(&pch->downl);  in ppp_mp_explode()
1906 static void __ppp_channel_push(struct channel *pch)  in __ppp_channel_push()  argument
1911 	spin_lock(&pch->downl);  in __ppp_channel_push()
1912 	if (pch->chan) {  in __ppp_channel_push()
1913 		while (!skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
1914 			skb = skb_dequeue(&pch->file.xq);  in __ppp_channel_push()
1915 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {  in __ppp_channel_push()
1917 				skb_queue_head(&pch->file.xq, skb);  in __ppp_channel_push()
1923 		skb_queue_purge(&pch->file.xq);  in __ppp_channel_push()
1925 	spin_unlock(&pch->downl);  in __ppp_channel_push()
1927 	if (skb_queue_empty(&pch->file.xq)) {  in __ppp_channel_push()
1928 		ppp = pch->ppp;  in __ppp_channel_push()
1934 static void ppp_channel_push(struct channel *pch)  in ppp_channel_push()  argument
1936 	read_lock_bh(&pch->upl);  in ppp_channel_push()
1937 	if (pch->ppp) {  in ppp_channel_push()
1938 		(*this_cpu_ptr(pch->ppp->xmit_recursion))++;  in ppp_channel_push()
1939 		__ppp_channel_push(pch);  in ppp_channel_push()
1940 		(*this_cpu_ptr(pch->ppp->xmit_recursion))--;  in ppp_channel_push()
1942 		__ppp_channel_push(pch);  in ppp_channel_push()
1944 	read_unlock_bh(&pch->upl);  in ppp_channel_push()
1958 ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_do_recv()  argument
1962 		ppp_receive_frame(ppp, skb, pch);  in ppp_do_recv()
1971 	struct channel *pch = chan->ppp;  in ppp_input()  local
1974 	if (!pch) {  in ppp_input()
1979 	read_lock_bh(&pch->upl);  in ppp_input()
1982 		if (pch->ppp) {  in ppp_input()
1983 			++pch->ppp->dev->stats.rx_length_errors;  in ppp_input()
1984 			ppp_receive_error(pch->ppp);  in ppp_input()
1990 	if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {  in ppp_input()
1992 		skb_queue_tail(&pch->file.rq, skb);  in ppp_input()
1994 		while (pch->file.rq.qlen > PPP_MAX_RQLEN &&  in ppp_input()
1995 		       (skb = skb_dequeue(&pch->file.rq)))  in ppp_input()
1997 		wake_up_interruptible(&pch->file.rwait);  in ppp_input()
1999 		ppp_do_recv(pch->ppp, skb, pch);  in ppp_input()
2003 	read_unlock_bh(&pch->upl);  in ppp_input()
2010 	struct channel *pch = chan->ppp;  in ppp_input_error()  local
2013 	if (!pch)  in ppp_input_error()
2016 	read_lock_bh(&pch->upl);  in ppp_input_error()
2017 	if (pch->ppp) {  in ppp_input_error()
2022 			ppp_do_recv(pch->ppp, skb, pch);  in ppp_input_error()
2025 	read_unlock_bh(&pch->upl);  in ppp_input_error()
2033 ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_frame()  argument
2041 			ppp_receive_mp_frame(ppp, skb, pch);  in ppp_receive_frame()
2271 ppp_receive_mp_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)  in ppp_receive_mp_frame()  argument
2307 	pch->lastseq = seq;  in ppp_receive_mp_frame()
2558 	struct channel *pch;  in ppp_register_net_channel()  local
2561 	pch = kzalloc(sizeof(struct channel), GFP_KERNEL);  in ppp_register_net_channel()
2562 	if (!pch)  in ppp_register_net_channel()
2567 	pch->ppp = NULL;  in ppp_register_net_channel()
2568 	pch->chan = chan;  in ppp_register_net_channel()
2569 	pch->chan_net = get_net(net);  in ppp_register_net_channel()
2570 	chan->ppp = pch;  in ppp_register_net_channel()
2571 	init_ppp_file(&pch->file, CHANNEL);  in ppp_register_net_channel()
2572 	pch->file.hdrlen = chan->hdrlen;  in ppp_register_net_channel()
2574 	pch->lastseq = -1;  in ppp_register_net_channel()
2576 	init_rwsem(&pch->chan_sem);  in ppp_register_net_channel()
2577 	spin_lock_init(&pch->downl);  in ppp_register_net_channel()
2578 	rwlock_init(&pch->upl);  in ppp_register_net_channel()
2581 	pch->file.index = ++pn->last_channel_index;  in ppp_register_net_channel()
2582 	list_add(&pch->list, &pn->new_channels);  in ppp_register_net_channel()
2594 	struct channel *pch = chan->ppp;  in ppp_channel_index()  local
2596 	if (pch)  in ppp_channel_index()
2597 		return pch->file.index;  in ppp_channel_index()
2606 	struct channel *pch = chan->ppp;  in ppp_unit_number()  local
2609 	if (pch) {  in ppp_unit_number()
2610 		read_lock_bh(&pch->upl);  in ppp_unit_number()
2611 		if (pch->ppp)  in ppp_unit_number()
2612 			unit = pch->ppp->file.index;  in ppp_unit_number()
2613 		read_unlock_bh(&pch->upl);  in ppp_unit_number()
2623 	struct channel *pch = chan->ppp;  in ppp_dev_name()  local
2626 	if (pch) {  in ppp_dev_name()
2627 		read_lock_bh(&pch->upl);  in ppp_dev_name()
2628 		if (pch->ppp && pch->ppp->dev)  in ppp_dev_name()
2629 			name = pch->ppp->dev->name;  in ppp_dev_name()
2630 		read_unlock_bh(&pch->upl);  in ppp_dev_name()
2643 	struct channel *pch = chan->ppp;  in ppp_unregister_channel()  local
2646 	if (!pch)  in ppp_unregister_channel()
2655 	down_write(&pch->chan_sem);  in ppp_unregister_channel()
2656 	spin_lock_bh(&pch->downl);  in ppp_unregister_channel()
2657 	pch->chan = NULL;  in ppp_unregister_channel()
2658 	spin_unlock_bh(&pch->downl);  in ppp_unregister_channel()
2659 	up_write(&pch->chan_sem);  in ppp_unregister_channel()
2660 	ppp_disconnect_channel(pch);  in ppp_unregister_channel()
2662 	pn = ppp_pernet(pch->chan_net);  in ppp_unregister_channel()
2664 	list_del(&pch->list);  in ppp_unregister_channel()
2667 	pch->file.dead = 1;  in ppp_unregister_channel()
2668 	wake_up_interruptible(&pch->file.rwait);  in ppp_unregister_channel()
2669 	if (refcount_dec_and_test(&pch->file.refcnt))  in ppp_unregister_channel()
2670 		ppp_destroy_channel(pch);  in ppp_unregister_channel()
2680 	struct channel *pch = chan->ppp;  in ppp_output_wakeup()  local
2682 	if (!pch)  in ppp_output_wakeup()
2684 	ppp_channel_push(pch);  in ppp_output_wakeup()
3109 	struct channel *pch;  in ppp_find_channel()  local
3111 	list_for_each_entry(pch, &pn->new_channels, list) {  in ppp_find_channel()
3112 		if (pch->file.index == unit) {  in ppp_find_channel()
3113 			list_move(&pch->list, &pn->all_channels);  in ppp_find_channel()
3114 			return pch;  in ppp_find_channel()
3118 	list_for_each_entry(pch, &pn->all_channels, list) {  in ppp_find_channel()
3119 		if (pch->file.index == unit)  in ppp_find_channel()
3120 			return pch;  in ppp_find_channel()
3130 ppp_connect_channel(struct channel *pch, int unit)  in ppp_connect_channel()  argument
3137 	pn = ppp_pernet(pch->chan_net);  in ppp_connect_channel()
3143 	write_lock_bh(&pch->upl);  in ppp_connect_channel()
3145 	if (pch->ppp)  in ppp_connect_channel()
3149 	spin_lock_bh(&pch->downl);  in ppp_connect_channel()
3150 	if (!pch->chan) {  in ppp_connect_channel()
3152 		spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3157 	spin_unlock_bh(&pch->downl);  in ppp_connect_channel()
3158 	if (pch->file.hdrlen > ppp->file.hdrlen)  in ppp_connect_channel()
3159 		ppp->file.hdrlen = pch->file.hdrlen;  in ppp_connect_channel()
3160 	hdrlen = pch->file.hdrlen + 2;	/* for protocol bytes */  in ppp_connect_channel()
3163 	list_add_tail(&pch->clist, &ppp->channels);  in ppp_connect_channel()
3165 	pch->ppp = ppp;  in ppp_connect_channel()
3171 	write_unlock_bh(&pch->upl);  in ppp_connect_channel()
3181 ppp_disconnect_channel(struct channel *pch)  in ppp_disconnect_channel()  argument
3186 	write_lock_bh(&pch->upl);  in ppp_disconnect_channel()
3187 	ppp = pch->ppp;  in ppp_disconnect_channel()
3188 	pch->ppp = NULL;  in ppp_disconnect_channel()
3189 	write_unlock_bh(&pch->upl);  in ppp_disconnect_channel()
3193 		list_del(&pch->clist);  in ppp_disconnect_channel()
3207 static void ppp_destroy_channel(struct channel *pch)  in ppp_destroy_channel()  argument
3209 	put_net(pch->chan_net);  in ppp_destroy_channel()
3210 	pch->chan_net = NULL;  in ppp_destroy_channel()
3214 	if (!pch->file.dead) {  in ppp_destroy_channel()
3216 		pr_err("ppp: destroying undead channel %p !\n", pch);  in ppp_destroy_channel()
3219 	skb_queue_purge(&pch->file.xq);  in ppp_destroy_channel()
3220 	skb_queue_purge(&pch->file.rq);  in ppp_destroy_channel()
3221 	kfree(pch);  in ppp_destroy_channel()