Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 654 insertions, 0 deletions

diff --git a/drivers/isdn/mISDN/stack.c b/drivers/isdn/mISDN/stack.c
new file mode 100644
index 0000000000..c2f76f3986
--- /dev/null
+++ b/drivers/isdn/mISDN/stack.c
@@ -0,0 +1,654 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Author	Karsten Keil <kkeil@novell.com>
+ *
+ * Copyright 2008  by Karsten Keil <kkeil@novell.com>
+ */
+
+#include <linux/slab.h>
+#include <linux/mISDNif.h>
+#include <linux/kthread.h>
+#include <linux/sched.h>
+#include <linux/sched/cputime.h>
+#include <linux/signal.h>
+
+#include "core.h"
+
+static u_int	*debug;
+
+static inline void
+_queue_message(struct mISDNstack *st, struct sk_buff *skb)
+{
+	struct mISDNhead	*hh = mISDN_HEAD_P(skb);
+
+	if (*debug & DEBUG_QUEUE_FUNC)
+		printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n",
+		       __func__, hh->prim, hh->id, skb);
+	skb_queue_tail(&st->msgq, skb);
+	if (likely(!test_bit(mISDN_STACK_STOPPED, &st->status))) {
+		test_and_set_bit(mISDN_STACK_WORK, &st->status);
+		wake_up_interruptible(&st->workq);
+	}
+}
+
+static int
+mISDN_queue_message(struct mISDNchannel *ch, struct sk_buff *skb)
+{
+	_queue_message(ch->st, skb);
+	return 0;
+}
+
+static struct mISDNchannel *
+get_channel4id(struct mISDNstack *st, u_int id)
+{
+	struct mISDNchannel	*ch;
+
+	mutex_lock(&st->lmutex);
+	list_for_each_entry(ch, &st->layer2, list) {
+		if (id == ch->nr)
+			goto unlock;
+	}
+	ch = NULL;
+unlock:
+	mutex_unlock(&st->lmutex);
+	return ch;
+}
+
+static void
+send_socklist(struct mISDN_sock_list *sl, struct sk_buff *skb)
+{
+	struct sock		*sk;
+	struct sk_buff		*cskb = NULL;
+
+	read_lock(&sl->lock);
+	sk_for_each(sk, &sl->head) {
+		if (sk->sk_state != MISDN_BOUND)
+			continue;
+		if (!cskb)
+			cskb = skb_copy(skb, GFP_ATOMIC);
+		if (!cskb) {
+			printk(KERN_WARNING "%s no skb\n", __func__);
+			break;
+		}
+		if (!sock_queue_rcv_skb(sk, cskb))
+			cskb = NULL;
+	}
+	read_unlock(&sl->lock);
+	dev_kfree_skb(cskb);
+}
+
+static void
+send_layer2(struct mISDNstack *st, struct sk_buff *skb)
+{
+	struct sk_buff		*cskb;
+	struct mISDNhead	*hh = mISDN_HEAD_P(skb);
+	struct mISDNchannel	*ch;
+	int			ret;
+
+	if (!st)
+		return;
+	mutex_lock(&st->lmutex);
+	if ((hh->id & MISDN_ID_ADDR_MASK) == MISDN_ID_ANY) { /* L2 for all */
+		list_for_each_entry(ch, &st->layer2, list) {
+			if (list_is_last(&ch->list, &st->layer2)) {
+				cskb = skb;
+				skb = NULL;
+			} else {
+				cskb = skb_copy(skb, GFP_KERNEL);
+			}
+			if (cskb) {
+				ret = ch->send(ch, cskb);
+				if (ret) {
+					if (*debug & DEBUG_SEND_ERR)
+						printk(KERN_DEBUG
+						       "%s ch%d prim(%x) addr(%x)"
+						       " err %d\n",
+						       __func__, ch->nr,
+						       hh->prim, ch->addr, ret);
+					dev_kfree_skb(cskb);
+				}
+			} else {
+				printk(KERN_WARNING "%s ch%d addr %x no mem\n",
+				       __func__, ch->nr, ch->addr);
+				goto out;
+			}
+		}
+	} else {
+		list_for_each_entry(ch, &st->layer2, list) {
+			if ((hh->id & MISDN_ID_ADDR_MASK) == ch->addr) {
+				ret = ch->send(ch, skb);
+				if (!ret)
+					skb = NULL;
+				goto out;
+			}
+		}
+		ret = st->dev->teimgr->ctrl(st->dev->teimgr, CHECK_DATA, skb);
+		if (!ret)
+			skb = NULL;
+		else if (*debug & DEBUG_SEND_ERR)
+			printk(KERN_DEBUG
+			       "%s mgr prim(%x) err %d\n",
+			       __func__, hh->prim, ret);
+	}
+out:
+	mutex_unlock(&st->lmutex);
+	dev_kfree_skb(skb);
+}
+
+static inline int
+send_msg_to_layer(struct mISDNstack *st, struct sk_buff *skb)
+{
+	struct mISDNhead	*hh = mISDN_HEAD_P(skb);
+	struct mISDNchannel	*ch;
+	int	lm;
+
+	lm = hh->prim & MISDN_LAYERMASK;
+	if (*debug & DEBUG_QUEUE_FUNC)
+		printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n",
+		       __func__, hh->prim, hh->id, skb);
+	if (lm == 0x1) {
+		if (!hlist_empty(&st->l1sock.head)) {
+			__net_timestamp(skb);
+			send_socklist(&st->l1sock, skb);
+		}
+		return st->layer1->send(st->layer1, skb);
+	} else if (lm == 0x2) {
+		if (!hlist_empty(&st->l1sock.head))
+			send_socklist(&st->l1sock, skb);
+		send_layer2(st, skb);
+		return 0;
+	} else if (lm == 0x4) {
+		ch = get_channel4id(st, hh->id);
+		if (ch)
+			return ch->send(ch, skb);
+		else
+			printk(KERN_WARNING
+			       "%s: dev(%s) prim(%x) id(%x) no channel\n",
+			       __func__, dev_name(&st->dev->dev), hh->prim,
+			       hh->id);
+	} else if (lm == 0x8) {
+		WARN_ON(lm == 0x8);
+		ch = get_channel4id(st, hh->id);
+		if (ch)
+			return ch->send(ch, skb);
+		else
+			printk(KERN_WARNING
+			       "%s: dev(%s) prim(%x) id(%x) no channel\n",
+			       __func__, dev_name(&st->dev->dev), hh->prim,
+			       hh->id);
+	} else {
+		/* broadcast not handled yet */
+		printk(KERN_WARNING "%s: dev(%s) prim %x not delivered\n",
+		       __func__, dev_name(&st->dev->dev), hh->prim);
+	}
+	return -ESRCH;
+}
+
+static void
+do_clear_stack(struct mISDNstack *st)
+{
+}
+
+static int
+mISDNStackd(void *data)
+{
+	struct mISDNstack *st = data;
+#ifdef MISDN_MSG_STATS
+	u64 utime, stime;
+#endif
+	int err = 0;
+
+	sigfillset(&current->blocked);
+	if (*debug & DEBUG_MSG_THREAD)
+		printk(KERN_DEBUG "mISDNStackd %s started\n",
+		       dev_name(&st->dev->dev));
+
+	if (st->notify != NULL) {
+		complete(st->notify);
+		st->notify = NULL;
+	}
+
+	for (;;) {
+		struct sk_buff	*skb;
+
+		if (unlikely(test_bit(mISDN_STACK_STOPPED, &st->status))) {
+			test_and_clear_bit(mISDN_STACK_WORK, &st->status);
+			test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
+		} else
+			test_and_set_bit(mISDN_STACK_RUNNING, &st->status);
+		while (test_bit(mISDN_STACK_WORK, &st->status)) {
+			skb = skb_dequeue(&st->msgq);
+			if (!skb) {
+				test_and_clear_bit(mISDN_STACK_WORK,
+						   &st->status);
+				/* test if a race happens */
+				skb = skb_dequeue(&st->msgq);
+				if (!skb)
+					continue;
+				test_and_set_bit(mISDN_STACK_WORK,
+						 &st->status);
+			}
+#ifdef MISDN_MSG_STATS
+			st->msg_cnt++;
+#endif
+			err = send_msg_to_layer(st, skb);
+			if (unlikely(err)) {
+				if (*debug & DEBUG_SEND_ERR)
+					printk(KERN_DEBUG
+					       "%s: %s prim(%x) id(%x) "
+					       "send call(%d)\n",
+					       __func__, dev_name(&st->dev->dev),
+					       mISDN_HEAD_PRIM(skb),
+					       mISDN_HEAD_ID(skb), err);
+				dev_kfree_skb(skb);
+				continue;
+			}
+			if (unlikely(test_bit(mISDN_STACK_STOPPED,
+					      &st->status))) {
+				test_and_clear_bit(mISDN_STACK_WORK,
+						   &st->status);
+				test_and_clear_bit(mISDN_STACK_RUNNING,
+						   &st->status);
+				break;
+			}
+		}
+		if (test_bit(mISDN_STACK_CLEARING, &st->status)) {
+			test_and_set_bit(mISDN_STACK_STOPPED, &st->status);
+			test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
+			do_clear_stack(st);
+			test_and_clear_bit(mISDN_STACK_CLEARING, &st->status);
+			test_and_set_bit(mISDN_STACK_RESTART, &st->status);
+		}
+		if (test_and_clear_bit(mISDN_STACK_RESTART, &st->status)) {
+			test_and_clear_bit(mISDN_STACK_STOPPED, &st->status);
+			test_and_set_bit(mISDN_STACK_RUNNING, &st->status);
+			if (!skb_queue_empty(&st->msgq))
+				test_and_set_bit(mISDN_STACK_WORK,
+						 &st->status);
+		}
+		if (test_bit(mISDN_STACK_ABORT, &st->status))
+			break;
+		if (st->notify != NULL) {
+			complete(st->notify);
+			st->notify = NULL;
+		}
+#ifdef MISDN_MSG_STATS
+		st->sleep_cnt++;
+#endif
+		test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status);
+		wait_event_interruptible(st->workq, (st->status &
+						     mISDN_STACK_ACTION_MASK));
+		if (*debug & DEBUG_MSG_THREAD)
+			printk(KERN_DEBUG "%s: %s wake status %08lx\n",
+			       __func__, dev_name(&st->dev->dev), st->status);
+		test_and_set_bit(mISDN_STACK_ACTIVE, &st->status);
+
+		test_and_clear_bit(mISDN_STACK_WAKEUP, &st->status);
+
+		if (test_bit(mISDN_STACK_STOPPED, &st->status)) {
+			test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
+#ifdef MISDN_MSG_STATS
+			st->stopped_cnt++;
+#endif
+		}
+	}
+#ifdef MISDN_MSG_STATS
+	printk(KERN_DEBUG "mISDNStackd daemon for %s proceed %d "
+	       "msg %d sleep %d stopped\n",
+	       dev_name(&st->dev->dev), st->msg_cnt, st->sleep_cnt,
+	       st->stopped_cnt);
+	task_cputime(st->thread, &utime, &stime);
+	printk(KERN_DEBUG
+	       "mISDNStackd daemon for %s utime(%llu) stime(%llu)\n",
+	       dev_name(&st->dev->dev), utime, stime);
+	printk(KERN_DEBUG
+	       "mISDNStackd daemon for %s nvcsw(%ld) nivcsw(%ld)\n",
+	       dev_name(&st->dev->dev), st->thread->nvcsw, st->thread->nivcsw);
+	printk(KERN_DEBUG "mISDNStackd daemon for %s killed now\n",
+	       dev_name(&st->dev->dev));
+#endif
+	test_and_set_bit(mISDN_STACK_KILLED, &st->status);
+	test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
+	test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status);
+	test_and_clear_bit(mISDN_STACK_ABORT, &st->status);
+	skb_queue_purge(&st->msgq);
+	st->thread = NULL;
+	if (st->notify != NULL) {
+		complete(st->notify);
+		st->notify = NULL;
+	}
+	return 0;
+}
+
+static int
+l1_receive(struct mISDNchannel *ch, struct sk_buff *skb)
+{
+	if (!ch->st)
+		return -ENODEV;
+	__net_timestamp(skb);
+	_queue_message(ch->st, skb);
+	return 0;
+}
+
+void
+set_channel_address(struct mISDNchannel *ch, u_int sapi, u_int tei)
+{
+	ch->addr = sapi | (tei << 8);
+}
+
+void
+__add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
+{
+	list_add_tail(&ch->list, &st->layer2);
+}
+
+void
+add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
+{
+	mutex_lock(&st->lmutex);
+	__add_layer2(ch, st);
+	mutex_unlock(&st->lmutex);
+}
+
+static int
+st_own_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
+{
+	if (!ch->st || !ch->st->layer1)
+		return -EINVAL;
+	return ch->st->layer1->ctrl(ch->st->layer1, cmd, arg);
+}
+
+int
+create_stack(struct mISDNdevice *dev)
+{
+	struct mISDNstack	*newst;
+	int			err;
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	newst = kzalloc(sizeof(struct mISDNstack), GFP_KERNEL);
+	if (!newst) {
+		printk(KERN_ERR "kmalloc mISDN_stack failed\n");
+		return -ENOMEM;
+	}
+	newst->dev = dev;
+	INIT_LIST_HEAD(&newst->layer2);
+	INIT_HLIST_HEAD(&newst->l1sock.head);
+	rwlock_init(&newst->l1sock.lock);
+	init_waitqueue_head(&newst->workq);
+	skb_queue_head_init(&newst->msgq);
+	mutex_init(&newst->lmutex);
+	dev->D.st = newst;
+	err = create_teimanager(dev);
+	if (err) {
+		printk(KERN_ERR "kmalloc teimanager failed\n");
+		kfree(newst);
+		return err;
+	}
+	dev->teimgr->peer = &newst->own;
+	dev->teimgr->recv = mISDN_queue_message;
+	dev->teimgr->st = newst;
+	newst->layer1 = &dev->D;
+	dev->D.recv = l1_receive;
+	dev->D.peer = &newst->own;
+	newst->own.st = newst;
+	newst->own.ctrl = st_own_ctrl;
+	newst->own.send = mISDN_queue_message;
+	newst->own.recv = mISDN_queue_message;
+	if (*debug & DEBUG_CORE_FUNC)
+		printk(KERN_DEBUG "%s: st(%s)\n", __func__,
+		       dev_name(&newst->dev->dev));
+	newst->notify = &done;
+	newst->thread = kthread_run(mISDNStackd, (void *)newst, "mISDN_%s",
+				    dev_name(&newst->dev->dev));
+	if (IS_ERR(newst->thread)) {
+		err = PTR_ERR(newst->thread);
+		printk(KERN_ERR
+		       "mISDN:cannot create kernel thread for %s (%d)\n",
+		       dev_name(&newst->dev->dev), err);
+		delete_teimanager(dev->teimgr);
+		kfree(newst);
+	} else
+		wait_for_completion(&done);
+	return err;
+}
+
+int
+connect_layer1(struct mISDNdevice *dev, struct mISDNchannel *ch,
+	       u_int protocol, struct sockaddr_mISDN *adr)
+{
+	struct mISDN_sock	*msk = container_of(ch, struct mISDN_sock, ch);
+	struct channel_req	rq;
+	int			err;
+
+
+	if (*debug &  DEBUG_CORE_FUNC)
+		printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
+		       __func__, dev_name(&dev->dev), protocol, adr->dev,
+		       adr->channel, adr->sapi, adr->tei);
+	switch (protocol) {
+	case ISDN_P_NT_S0:
+	case ISDN_P_NT_E1:
+	case ISDN_P_TE_S0:
+	case ISDN_P_TE_E1:
+		ch->recv = mISDN_queue_message;
+		ch->peer = &dev->D.st->own;
+		ch->st = dev->D.st;
+		rq.protocol = protocol;
+		rq.adr.channel = adr->channel;
+		err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
+		printk(KERN_DEBUG "%s: ret %d (dev %d)\n", __func__, err,
+		       dev->id);
+		if (err)
+			return err;
+		write_lock_bh(&dev->D.st->l1sock.lock);
+		sk_add_node(&msk->sk, &dev->D.st->l1sock.head);
+		write_unlock_bh(&dev->D.st->l1sock.lock);
+		break;
+	default:
+		return -ENOPROTOOPT;
+	}
+	return 0;
+}
+
+int
+connect_Bstack(struct mISDNdevice *dev, struct mISDNchannel *ch,
+	       u_int protocol, struct sockaddr_mISDN *adr)
+{
+	struct channel_req	rq, rq2;
+	int			pmask, err;
+	struct Bprotocol	*bp;
+
+	if (*debug &  DEBUG_CORE_FUNC)
+		printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
+		       __func__, dev_name(&dev->dev), protocol,
+		       adr->dev, adr->channel, adr->sapi,
+		       adr->tei);
+	ch->st = dev->D.st;
+	pmask = 1 << (protocol & ISDN_P_B_MASK);
+	if (pmask & dev->Bprotocols) {
+		rq.protocol = protocol;
+		rq.adr = *adr;
+		err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
+		if (err)
+			return err;
+		ch->recv = rq.ch->send;
+		ch->peer = rq.ch;
+		rq.ch->recv = ch->send;
+		rq.ch->peer = ch;
+		rq.ch->st = dev->D.st;
+	} else {
+		bp = get_Bprotocol4mask(pmask);
+		if (!bp)
+			return -ENOPROTOOPT;
+		rq2.protocol = protocol;
+		rq2.adr = *adr;
+		rq2.ch = ch;
+		err = bp->create(&rq2);
+		if (err)
+			return err;
+		ch->recv = rq2.ch->send;
+		ch->peer = rq2.ch;
+		rq2.ch->st = dev->D.st;
+		rq.protocol = rq2.protocol;
+		rq.adr = *adr;
+		err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
+		if (err) {
+			rq2.ch->ctrl(rq2.ch, CLOSE_CHANNEL, NULL);
+			return err;
+		}
+		rq2.ch->recv = rq.ch->send;
+		rq2.ch->peer = rq.ch;
+		rq.ch->recv = rq2.ch->send;
+		rq.ch->peer = rq2.ch;
+		rq.ch->st = dev->D.st;
+	}
+	ch->protocol = protocol;
+	ch->nr = rq.ch->nr;
+	return 0;
+}
+
+int
+create_l2entity(struct mISDNdevice *dev, struct mISDNchannel *ch,
+		u_int protocol, struct sockaddr_mISDN *adr)
+{
+	struct channel_req	rq;
+	int			err;
+
+	if (*debug &  DEBUG_CORE_FUNC)
+		printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
+		       __func__, dev_name(&dev->dev), protocol,
+		       adr->dev, adr->channel, adr->sapi,
+		       adr->tei);
+	rq.protocol = ISDN_P_TE_S0;
+	if (dev->Dprotocols & (1 << ISDN_P_TE_E1))
+		rq.protocol = ISDN_P_TE_E1;
+	switch (protocol) {
+	case ISDN_P_LAPD_NT:
+		rq.protocol = ISDN_P_NT_S0;
+		if (dev->Dprotocols & (1 << ISDN_P_NT_E1))
+			rq.protocol = ISDN_P_NT_E1;
+		fallthrough;
+	case ISDN_P_LAPD_TE:
+		ch->recv = mISDN_queue_message;
+		ch->peer = &dev->D.st->own;
+		ch->st = dev->D.st;
+		rq.adr.channel = 0;
+		err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
+		printk(KERN_DEBUG "%s: ret 1 %d\n", __func__, err);
+		if (err)
+			break;
+		rq.protocol = protocol;
+		rq.adr = *adr;
+		rq.ch = ch;
+		err = dev->teimgr->ctrl(dev->teimgr, OPEN_CHANNEL, &rq);
+		printk(KERN_DEBUG "%s: ret 2 %d\n", __func__, err);
+		if (!err) {
+			if ((protocol == ISDN_P_LAPD_NT) && !rq.ch)
+				break;
+			add_layer2(rq.ch, dev->D.st);
+			rq.ch->recv = mISDN_queue_message;
+			rq.ch->peer = &dev->D.st->own;
+			rq.ch->ctrl(rq.ch, OPEN_CHANNEL, NULL); /* can't fail */
+		}
+		break;
+	default:
+		err = -EPROTONOSUPPORT;
+	}
+	return err;
+}
+
+void
+delete_channel(struct mISDNchannel *ch)
+{
+	struct mISDN_sock	*msk = container_of(ch, struct mISDN_sock, ch);
+	struct mISDNchannel	*pch;
+
+	if (!ch->st) {
+		printk(KERN_WARNING "%s: no stack\n", __func__);
+		return;
+	}
+	if (*debug & DEBUG_CORE_FUNC)
+		printk(KERN_DEBUG "%s: st(%s) protocol(%x)\n", __func__,
+		       dev_name(&ch->st->dev->dev), ch->protocol);
+	if (ch->protocol >= ISDN_P_B_START) {
+		if (ch->peer) {
+			ch->peer->ctrl(ch->peer, CLOSE_CHANNEL, NULL);
+			ch->peer = NULL;
+		}
+		return;
+	}
+	switch (ch->protocol) {
+	case ISDN_P_NT_S0:
+	case ISDN_P_TE_S0:
+	case ISDN_P_NT_E1:
+	case ISDN_P_TE_E1:
+		write_lock_bh(&ch->st->l1sock.lock);
+		sk_del_node_init(&msk->sk);
+		write_unlock_bh(&ch->st->l1sock.lock);
+		ch->st->dev->D.ctrl(&ch->st->dev->D, CLOSE_CHANNEL, NULL);
+		break;
+	case ISDN_P_LAPD_TE:
+		pch = get_channel4id(ch->st, ch->nr);
+		if (pch) {
+			mutex_lock(&ch->st->lmutex);
+			list_del(&pch->list);
+			mutex_unlock(&ch->st->lmutex);
+			pch->ctrl(pch, CLOSE_CHANNEL, NULL);
+			pch = ch->st->dev->teimgr;
+			pch->ctrl(pch, CLOSE_CHANNEL, NULL);
+		} else
+			printk(KERN_WARNING "%s: no l2 channel\n",
+			       __func__);
+		break;
+	case ISDN_P_LAPD_NT:
+		pch = ch->st->dev->teimgr;
+		if (pch) {
+			pch->ctrl(pch, CLOSE_CHANNEL, NULL);
+		} else
+			printk(KERN_WARNING "%s: no l2 channel\n",
+			       __func__);
+		break;
+	default:
+		break;
+	}
+	return;
+}
+
+void
+delete_stack(struct mISDNdevice *dev)
+{
+	struct mISDNstack	*st = dev->D.st;
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	if (*debug & DEBUG_CORE_FUNC)
+		printk(KERN_DEBUG "%s: st(%s)\n", __func__,
+		       dev_name(&st->dev->dev));
+	if (dev->teimgr)
+		delete_teimanager(dev->teimgr);
+	if (st->thread) {
+		if (st->notify) {
+			printk(KERN_WARNING "%s: notifier in use\n",
+			       __func__);
+			complete(st->notify);
+		}
+		st->notify = &done;
+		test_and_set_bit(mISDN_STACK_ABORT, &st->status);
+		test_and_set_bit(mISDN_STACK_WAKEUP, &st->status);
+		wake_up_interruptible(&st->workq);
+		wait_for_completion(&done);
+	}
+	if (!list_empty(&st->layer2))
+		printk(KERN_WARNING "%s: layer2 list not empty\n",
+		       __func__);
+	if (!hlist_empty(&st->l1sock.head))
+		printk(KERN_WARNING "%s: layer1 list not empty\n",
+		       __func__);
+	kfree(st);
+}
+
+void
+mISDN_initstack(u_int *dp)
+{
+	debug = dp;
+}