Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1843 insertions, 0 deletions

diff --git a/kernel/drivers/isdn/hisax/isdnl2.c b/kernel/drivers/isdn/hisax/isdnl2.c
new file mode 100644
index 000000000..18accb0a7
--- /dev/null
+++ b/kernel/drivers/isdn/hisax/isdnl2.c
@@ -0,0 +1,1843 @@
+/* $Id: isdnl2.c,v 2.30.2.4 2004/02/11 13:21:34 keil Exp $
+ *
+ * Author       Karsten Keil
+ *              based on the teles driver from Jan den Ouden
+ * Copyright    by Karsten Keil      <keil@isdn4linux.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * For changes and modifications please read
+ * Documentation/isdn/HiSax.cert
+ *
+ * Thanks to    Jan den Ouden
+ *              Fritz Elfert
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include "hisax.h"
+#include "isdnl2.h"
+
+const char *l2_revision = "$Revision: 2.30.2.4 $";
+
+static void l2m_debug(struct FsmInst *fi, char *fmt, ...);
+
+static struct Fsm l2fsm;
+
+enum {
+	ST_L2_1,
+	ST_L2_2,
+	ST_L2_3,
+	ST_L2_4,
+	ST_L2_5,
+	ST_L2_6,
+	ST_L2_7,
+	ST_L2_8,
+};
+
+#define L2_STATE_COUNT (ST_L2_8 + 1)
+
+static char *strL2State[] =
+{
+	"ST_L2_1",
+	"ST_L2_2",
+	"ST_L2_3",
+	"ST_L2_4",
+	"ST_L2_5",
+	"ST_L2_6",
+	"ST_L2_7",
+	"ST_L2_8",
+};
+
+enum {
+	EV_L2_UI,
+	EV_L2_SABME,
+	EV_L2_DISC,
+	EV_L2_DM,
+	EV_L2_UA,
+	EV_L2_FRMR,
+	EV_L2_SUPER,
+	EV_L2_I,
+	EV_L2_DL_DATA,
+	EV_L2_ACK_PULL,
+	EV_L2_DL_UNIT_DATA,
+	EV_L2_DL_ESTABLISH_REQ,
+	EV_L2_DL_RELEASE_REQ,
+	EV_L2_MDL_ASSIGN,
+	EV_L2_MDL_REMOVE,
+	EV_L2_MDL_ERROR,
+	EV_L1_DEACTIVATE,
+	EV_L2_T200,
+	EV_L2_T203,
+	EV_L2_SET_OWN_BUSY,
+	EV_L2_CLEAR_OWN_BUSY,
+	EV_L2_FRAME_ERROR,
+};
+
+#define L2_EVENT_COUNT (EV_L2_FRAME_ERROR + 1)
+
+static char *strL2Event[] =
+{
+	"EV_L2_UI",
+	"EV_L2_SABME",
+	"EV_L2_DISC",
+	"EV_L2_DM",
+	"EV_L2_UA",
+	"EV_L2_FRMR",
+	"EV_L2_SUPER",
+	"EV_L2_I",
+	"EV_L2_DL_DATA",
+	"EV_L2_ACK_PULL",
+	"EV_L2_DL_UNIT_DATA",
+	"EV_L2_DL_ESTABLISH_REQ",
+	"EV_L2_DL_RELEASE_REQ",
+	"EV_L2_MDL_ASSIGN",
+	"EV_L2_MDL_REMOVE",
+	"EV_L2_MDL_ERROR",
+	"EV_L1_DEACTIVATE",
+	"EV_L2_T200",
+	"EV_L2_T203",
+	"EV_L2_SET_OWN_BUSY",
+	"EV_L2_CLEAR_OWN_BUSY",
+	"EV_L2_FRAME_ERROR",
+};
+
+static int l2addrsize(struct Layer2 *l2);
+
+static void
+set_peer_busy(struct Layer2 *l2) {
+	test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
+	if (!skb_queue_empty(&l2->i_queue) ||
+	    !skb_queue_empty(&l2->ui_queue))
+		test_and_set_bit(FLG_L2BLOCK, &l2->flag);
+}
+
+static void
+clear_peer_busy(struct Layer2 *l2) {
+	if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
+		test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
+}
+
+static void
+InitWin(struct Layer2 *l2)
+{
+	int i;
+
+	for (i = 0; i < MAX_WINDOW; i++)
+		l2->windowar[i] = NULL;
+}
+
+static int
+freewin1(struct Layer2 *l2)
+{
+	int i, cnt = 0;
+
+	for (i = 0; i < MAX_WINDOW; i++) {
+		if (l2->windowar[i]) {
+			cnt++;
+			dev_kfree_skb(l2->windowar[i]);
+			l2->windowar[i] = NULL;
+		}
+	}
+	return cnt;
+}
+
+static inline void
+freewin(struct PStack *st)
+{
+	freewin1(&st->l2);
+}
+
+static void
+ReleaseWin(struct Layer2 *l2)
+{
+	int cnt;
+
+	if ((cnt = freewin1(l2)))
+		printk(KERN_WARNING "isdl2 freed %d skbuffs in release\n", cnt);
+}
+
+static inline unsigned int
+cansend(struct PStack *st)
+{
+	unsigned int p1;
+
+	if (test_bit(FLG_MOD128, &st->l2.flag))
+		p1 = (st->l2.vs - st->l2.va) % 128;
+	else
+		p1 = (st->l2.vs - st->l2.va) % 8;
+	return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag));
+}
+
+static inline void
+clear_exception(struct Layer2 *l2)
+{
+	test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
+	test_and_clear_bit(FLG_REJEXC, &l2->flag);
+	test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
+	clear_peer_busy(l2);
+}
+
+static inline int
+l2headersize(struct Layer2 *l2, int ui)
+{
+	return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
+		(test_bit(FLG_LAPD, &l2->flag) ? 2 : 1));
+}
+
+inline int
+l2addrsize(struct Layer2 *l2)
+{
+	return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
+}
+
+static int
+sethdraddr(struct Layer2 *l2, u_char *header, int rsp)
+{
+	u_char *ptr = header;
+	int crbit = rsp;
+
+	if (test_bit(FLG_LAPD, &l2->flag)) {
+		*ptr++ = (l2->sap << 2) | (rsp ? 2 : 0);
+		*ptr++ = (l2->tei << 1) | 1;
+		return (2);
+	} else {
+		if (test_bit(FLG_ORIG, &l2->flag))
+			crbit = !crbit;
+		if (crbit)
+			*ptr++ = 1;
+		else
+			*ptr++ = 3;
+		return (1);
+	}
+}
+
+static inline void
+enqueue_super(struct PStack *st,
+	      struct sk_buff *skb)
+{
+	if (test_bit(FLG_LAPB, &st->l2.flag))
+		st->l1.bcs->tx_cnt += skb->len;
+	st->l2.l2l1(st, PH_DATA | REQUEST, skb);
+}
+
+#define enqueue_ui(a, b) enqueue_super(a, b)
+
+static inline int
+IsUI(u_char *data)
+{
+	return ((data[0] & 0xef) == UI);
+}
+
+static inline int
+IsUA(u_char *data)
+{
+	return ((data[0] & 0xef) == UA);
+}
+
+static inline int
+IsDM(u_char *data)
+{
+	return ((data[0] & 0xef) == DM);
+}
+
+static inline int
+IsDISC(u_char *data)
+{
+	return ((data[0] & 0xef) == DISC);
+}
+
+static inline int
+IsSFrame(u_char *data, struct PStack *st)
+{
+	register u_char d = *data;
+
+	if (!test_bit(FLG_MOD128, &st->l2.flag))
+		d &= 0xf;
+	return (((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c));
+}
+
+static inline int
+IsSABME(u_char *data, struct PStack *st)
+{
+	u_char d = data[0] & ~0x10;
+
+	return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM);
+}
+
+static inline int
+IsREJ(u_char *data, struct PStack *st)
+{
+	return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ);
+}
+
+static inline int
+IsFRMR(u_char *data)
+{
+	return ((data[0] & 0xef) == FRMR);
+}
+
+static inline int
+IsRNR(u_char *data, struct PStack *st)
+{
+	return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR);
+}
+
+static int
+iframe_error(struct PStack *st, struct sk_buff *skb)
+{
+	int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1);
+	int rsp = *skb->data & 0x2;
+
+	if (test_bit(FLG_ORIG, &st->l2.flag))
+		rsp = !rsp;
+
+	if (rsp)
+		return 'L';
+
+
+	if (skb->len < i)
+		return 'N';
+
+	if ((skb->len - i) > st->l2.maxlen)
+		return 'O';
+
+
+	return 0;
+}
+
+static int
+super_error(struct PStack *st, struct sk_buff *skb)
+{
+	if (skb->len != l2addrsize(&st->l2) +
+	    (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1))
+		return 'N';
+
+	return 0;
+}
+
+static int
+unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp)
+{
+	int rsp = (*skb->data & 0x2) >> 1;
+	if (test_bit(FLG_ORIG, &st->l2.flag))
+		rsp = !rsp;
+
+	if (rsp != wantrsp)
+		return 'L';
+
+	if (skb->len != l2addrsize(&st->l2) + 1)
+		return 'N';
+
+	return 0;
+}
+
+static int
+UI_error(struct PStack *st, struct sk_buff *skb)
+{
+	int rsp = *skb->data & 0x2;
+	if (test_bit(FLG_ORIG, &st->l2.flag))
+		rsp = !rsp;
+
+	if (rsp)
+		return 'L';
+
+	if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1)
+		return 'O';
+
+	return 0;
+}
+
+static int
+FRMR_error(struct PStack *st, struct sk_buff *skb)
+{
+	int headers = l2addrsize(&st->l2) + 1;
+	u_char *datap = skb->data + headers;
+	int rsp = *skb->data & 0x2;
+
+	if (test_bit(FLG_ORIG, &st->l2.flag))
+		rsp = !rsp;
+
+	if (!rsp)
+		return 'L';
+
+	if (test_bit(FLG_MOD128, &st->l2.flag)) {
+		if (skb->len < headers + 5)
+			return 'N';
+		else
+			l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x",
+				  datap[0], datap[1], datap[2],
+				  datap[3], datap[4]);
+	} else {
+		if (skb->len < headers + 3)
+			return 'N';
+		else
+			l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x",
+				  datap[0], datap[1], datap[2]);
+	}
+
+	return 0;
+}
+
+static unsigned int
+legalnr(struct PStack *st, unsigned int nr)
+{
+	struct Layer2 *l2 = &st->l2;
+
+	if (test_bit(FLG_MOD128, &l2->flag))
+		return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
+	else
+		return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
+}
+
+static void
+setva(struct PStack *st, unsigned int nr)
+{
+	struct Layer2 *l2 = &st->l2;
+	int len;
+	u_long flags;
+
+	spin_lock_irqsave(&l2->lock, flags);
+	while (l2->va != nr) {
+		(l2->va)++;
+		if (test_bit(FLG_MOD128, &l2->flag))
+			l2->va %= 128;
+		else
+			l2->va %= 8;
+		len = l2->windowar[l2->sow]->len;
+		if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type)
+			len = -1;
+		dev_kfree_skb(l2->windowar[l2->sow]);
+		l2->windowar[l2->sow] = NULL;
+		l2->sow = (l2->sow + 1) % l2->window;
+		spin_unlock_irqrestore(&l2->lock, flags);
+		if (test_bit(FLG_LLI_L2WAKEUP, &st->lli.flag) && (len >= 0))
+			lli_writewakeup(st, len);
+		spin_lock_irqsave(&l2->lock, flags);
+	}
+	spin_unlock_irqrestore(&l2->lock, flags);
+}
+
+static void
+send_uframe(struct PStack *st, u_char cmd, u_char cr)
+{
+	struct sk_buff *skb;
+	u_char tmp[MAX_HEADER_LEN];
+	int i;
+
+	i = sethdraddr(&st->l2, tmp, cr);
+	tmp[i++] = cmd;
+	if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
+		printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframe\n");
+		return;
+	}
+	memcpy(skb_put(skb, i), tmp, i);
+	enqueue_super(st, skb);
+}
+
+static inline u_char
+get_PollFlag(struct PStack *st, struct sk_buff *skb)
+{
+	return (skb->data[l2addrsize(&(st->l2))] & 0x10);
+}
+
+static inline u_char
+get_PollFlagFree(struct PStack *st, struct sk_buff *skb)
+{
+	u_char PF;
+
+	PF = get_PollFlag(st, skb);
+	dev_kfree_skb(skb);
+	return (PF);
+}
+
+static inline void
+start_t200(struct PStack *st, int i)
+{
+	FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
+	test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
+}
+
+static inline void
+restart_t200(struct PStack *st, int i)
+{
+	FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
+	test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
+}
+
+static inline void
+stop_t200(struct PStack *st, int i)
+{
+	if (test_and_clear_bit(FLG_T200_RUN, &st->l2.flag))
+		FsmDelTimer(&st->l2.t200, i);
+}
+
+static inline void
+st5_dl_release_l2l3(struct PStack *st)
+{
+	int pr;
+
+	if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
+		pr = DL_RELEASE | CONFIRM;
+	else
+		pr = DL_RELEASE | INDICATION;
+
+	st->l2.l2l3(st, pr, NULL);
+}
+
+static inline void
+lapb_dl_release_l2l3(struct PStack *st, int f)
+{
+	if (test_bit(FLG_LAPB, &st->l2.flag))
+		st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
+	st->l2.l2l3(st, DL_RELEASE | f, NULL);
+}
+
+static void
+establishlink(struct FsmInst *fi)
+{
+	struct PStack *st = fi->userdata;
+	u_char cmd;
+
+	clear_exception(&st->l2);
+	st->l2.rc = 0;
+	cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10;
+	send_uframe(st, cmd, CMD);
+	FsmDelTimer(&st->l2.t203, 1);
+	restart_t200(st, 1);
+	test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
+	freewin(st);
+	FsmChangeState(fi, ST_L2_5);
+}
+
+static void
+l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
+{
+	struct sk_buff *skb = arg;
+	struct PStack *st = fi->userdata;
+
+	if (get_PollFlagFree(st, skb))
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C');
+	else
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D');
+}
+
+static void
+l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
+{
+	struct sk_buff *skb = arg;
+	struct PStack *st = fi->userdata;
+
+	if (get_PollFlagFree(st, skb))
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
+	else {
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
+		establishlink(fi);
+		test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
+	}
+}
+
+static void
+l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
+{
+	struct sk_buff *skb = arg;
+	struct PStack *st = fi->userdata;
+
+	if (get_PollFlagFree(st, skb))
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
+	else {
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
+	}
+	establishlink(fi);
+	test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
+}
+
+static void
+l2_go_st3(struct FsmInst *fi, int event, void *arg)
+{
+	FsmChangeState(fi, ST_L2_3);
+}
+
+static void
+l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	FsmChangeState(fi, ST_L2_3);
+	st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
+}
+
+static void
+l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	skb_queue_tail(&st->l2.ui_queue, skb);
+	FsmChangeState(fi, ST_L2_2);
+	st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
+}
+
+static void
+l2_queue_ui(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	skb_queue_tail(&st->l2.ui_queue, skb);
+}
+
+static void
+tx_ui(struct PStack *st)
+{
+	struct sk_buff *skb;
+	u_char header[MAX_HEADER_LEN];
+	int i;
+
+	i = sethdraddr(&(st->l2), header, CMD);
+	header[i++] = UI;
+	while ((skb = skb_dequeue(&st->l2.ui_queue))) {
+		memcpy(skb_push(skb, i), header, i);
+		enqueue_ui(st, skb);
+	}
+}
+
+static void
+l2_send_ui(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	skb_queue_tail(&st->l2.ui_queue, skb);
+	tx_ui(st);
+}
+
+static void
+l2_got_ui(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	skb_pull(skb, l2headersize(&st->l2, 1));
+	st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb);
+/*	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ *		in states 1-3 for broadcast
+ */
+
+
+}
+
+static void
+l2_establish(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	establishlink(fi);
+	test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
+}
+
+static void
+l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
+	test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
+}
+
+static void
+l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	establishlink(fi);
+	test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
+}
+
+static void
+l2_release(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
+}
+
+static void
+l2_pend_rel(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	test_and_set_bit(FLG_PEND_REL, &st->l2.flag);
+}
+
+static void
+l2_disconnect(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	freewin(st);
+	FsmChangeState(fi, ST_L2_6);
+	st->l2.rc = 0;
+	send_uframe(st, DISC | 0x10, CMD);
+	FsmDelTimer(&st->l2.t203, 1);
+	restart_t200(st, 2);
+}
+
+static void
+l2_start_multi(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
+
+	clear_exception(&st->l2);
+	st->l2.vs = 0;
+	st->l2.va = 0;
+	st->l2.vr = 0;
+	st->l2.sow = 0;
+	FsmChangeState(fi, ST_L2_7);
+	FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
+
+	st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
+}
+
+static void
+l2_send_UA(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
+}
+
+static void
+l2_send_DM(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	send_uframe(st, DM | get_PollFlagFree(st, skb), RSP);
+}
+
+static void
+l2_restart_multi(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int est = 0, state;
+
+	state = fi->state;
+
+	send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
+
+	st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F');
+
+	if (st->l2.vs != st->l2.va) {
+		skb_queue_purge(&st->l2.i_queue);
+		est = 1;
+	}
+
+	clear_exception(&st->l2);
+	st->l2.vs = 0;
+	st->l2.va = 0;
+	st->l2.vr = 0;
+	st->l2.sow = 0;
+	FsmChangeState(fi, ST_L2_7);
+	stop_t200(st, 3);
+	FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
+
+	if (est)
+		st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
+
+	if ((ST_L2_7 == state) || (ST_L2_8 == state))
+		if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
+			st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+}
+
+static void
+l2_stop_multi(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	FsmChangeState(fi, ST_L2_4);
+	FsmDelTimer(&st->l2.t203, 3);
+	stop_t200(st, 4);
+
+	send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
+
+	skb_queue_purge(&st->l2.i_queue);
+	freewin(st);
+	lapb_dl_release_l2l3(st, INDICATION);
+}
+
+static void
+l2_connected(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int pr = -1;
+
+	if (!get_PollFlag(st, skb)) {
+		l2_mdl_error_ua(fi, event, arg);
+		return;
+	}
+	dev_kfree_skb(skb);
+
+	if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
+		l2_disconnect(fi, event, arg);
+
+	if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) {
+		pr = DL_ESTABLISH | CONFIRM;
+	} else if (st->l2.vs != st->l2.va) {
+		skb_queue_purge(&st->l2.i_queue);
+		pr = DL_ESTABLISH | INDICATION;
+	}
+
+	stop_t200(st, 5);
+
+	st->l2.vr = 0;
+	st->l2.vs = 0;
+	st->l2.va = 0;
+	st->l2.sow = 0;
+	FsmChangeState(fi, ST_L2_7);
+	FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4);
+
+	if (pr != -1)
+		st->l2.l2l3(st, pr, NULL);
+
+	if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
+		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+}
+
+static void
+l2_released(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (!get_PollFlag(st, skb)) {
+		l2_mdl_error_ua(fi, event, arg);
+		return;
+	}
+	dev_kfree_skb(skb);
+
+	stop_t200(st, 6);
+	lapb_dl_release_l2l3(st, CONFIRM);
+	FsmChangeState(fi, ST_L2_4);
+}
+
+static void
+l2_reestablish(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (!get_PollFlagFree(st, skb)) {
+		establishlink(fi);
+		test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
+	}
+}
+
+static void
+l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (get_PollFlagFree(st, skb)) {
+		stop_t200(st, 7);
+		if (!test_bit(FLG_L3_INIT, &st->l2.flag))
+			skb_queue_purge(&st->l2.i_queue);
+		if (test_bit(FLG_LAPB, &st->l2.flag))
+			st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
+		st5_dl_release_l2l3(st);
+		FsmChangeState(fi, ST_L2_4);
+	}
+}
+
+static void
+l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (get_PollFlagFree(st, skb)) {
+		stop_t200(st, 8);
+		lapb_dl_release_l2l3(st, CONFIRM);
+		FsmChangeState(fi, ST_L2_4);
+	}
+}
+
+static inline void
+enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf)
+{
+	struct sk_buff *skb;
+	struct Layer2 *l2;
+	u_char tmp[MAX_HEADER_LEN];
+	int i;
+
+	l2 = &st->l2;
+	i = sethdraddr(l2, tmp, cr);
+	if (test_bit(FLG_MOD128, &l2->flag)) {
+		tmp[i++] = typ;
+		tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
+	} else
+		tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
+	if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
+		printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_cr\n");
+		return;
+	}
+	memcpy(skb_put(skb, i), tmp, i);
+	enqueue_super(st, skb);
+}
+
+static inline void
+enquiry_response(struct PStack *st)
+{
+	if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
+		enquiry_cr(st, RNR, RSP, 1);
+	else
+		enquiry_cr(st, RR, RSP, 1);
+	test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
+}
+
+static inline void
+transmit_enquiry(struct PStack *st)
+{
+	if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
+		enquiry_cr(st, RNR, CMD, 1);
+	else
+		enquiry_cr(st, RR, CMD, 1);
+	test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
+	start_t200(st, 9);
+}
+
+
+static void
+nrerrorrecovery(struct FsmInst *fi)
+{
+	struct PStack *st = fi->userdata;
+
+	st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J');
+	establishlink(fi);
+	test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
+}
+
+static void
+invoke_retransmission(struct PStack *st, unsigned int nr)
+{
+	struct Layer2 *l2 = &st->l2;
+	u_int p1;
+	u_long flags;
+
+	spin_lock_irqsave(&l2->lock, flags);
+	if (l2->vs != nr) {
+		while (l2->vs != nr) {
+			(l2->vs)--;
+			if (test_bit(FLG_MOD128, &l2->flag)) {
+				l2->vs %= 128;
+				p1 = (l2->vs - l2->va) % 128;
+			} else {
+				l2->vs %= 8;
+				p1 = (l2->vs - l2->va) % 8;
+			}
+			p1 = (p1 + l2->sow) % l2->window;
+			if (test_bit(FLG_LAPB, &l2->flag))
+				st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0);
+			skb_queue_head(&l2->i_queue, l2->windowar[p1]);
+			l2->windowar[p1] = NULL;
+		}
+		spin_unlock_irqrestore(&l2->lock, flags);
+		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+		return;
+	}
+	spin_unlock_irqrestore(&l2->lock, flags);
+}
+
+static void
+l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int PollFlag, rsp, typ = RR;
+	unsigned int nr;
+	struct Layer2 *l2 = &st->l2;
+
+	rsp = *skb->data & 0x2;
+	if (test_bit(FLG_ORIG, &l2->flag))
+		rsp = !rsp;
+
+	skb_pull(skb, l2addrsize(l2));
+	if (IsRNR(skb->data, st)) {
+		set_peer_busy(l2);
+		typ = RNR;
+	} else
+		clear_peer_busy(l2);
+	if (IsREJ(skb->data, st))
+		typ = REJ;
+
+	if (test_bit(FLG_MOD128, &l2->flag)) {
+		PollFlag = (skb->data[1] & 0x1) == 0x1;
+		nr = skb->data[1] >> 1;
+	} else {
+		PollFlag = (skb->data[0] & 0x10);
+		nr = (skb->data[0] >> 5) & 0x7;
+	}
+	dev_kfree_skb(skb);
+
+	if (PollFlag) {
+		if (rsp)
+			st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A');
+		else
+			enquiry_response(st);
+	}
+	if (legalnr(st, nr)) {
+		if (typ == REJ) {
+			setva(st, nr);
+			invoke_retransmission(st, nr);
+			stop_t200(st, 10);
+			if (FsmAddTimer(&st->l2.t203, st->l2.T203,
+					EV_L2_T203, NULL, 6))
+				l2m_debug(&st->l2.l2m, "Restart T203 ST7 REJ");
+		} else if ((nr == l2->vs) && (typ == RR)) {
+			setva(st, nr);
+			stop_t200(st, 11);
+			FsmRestartTimer(&st->l2.t203, st->l2.T203,
+					EV_L2_T203, NULL, 7);
+		} else if ((l2->va != nr) || (typ == RNR)) {
+			setva(st, nr);
+			if (typ != RR) FsmDelTimer(&st->l2.t203, 9);
+			restart_t200(st, 12);
+		}
+		if (!skb_queue_empty(&st->l2.i_queue) && (typ == RR))
+			st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+	} else
+		nrerrorrecovery(fi);
+}
+
+static void
+l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (test_bit(FLG_LAPB, &st->l2.flag))
+		st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
+	if (!test_bit(FLG_L3_INIT, &st->l2.flag))
+		skb_queue_tail(&st->l2.i_queue, skb);
+	else
+		dev_kfree_skb(skb);
+}
+
+static void
+l2_feed_i_pull(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (test_bit(FLG_LAPB, &st->l2.flag))
+		st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
+	skb_queue_tail(&st->l2.i_queue, skb);
+	st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+}
+
+static void
+l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	if (test_bit(FLG_LAPB, &st->l2.flag))
+		st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
+	skb_queue_tail(&st->l2.i_queue, skb);
+}
+
+static void
+l2_got_iframe(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	struct Layer2 *l2 = &(st->l2);
+	int PollFlag, ns, i;
+	unsigned int nr;
+
+	i = l2addrsize(l2);
+	if (test_bit(FLG_MOD128, &l2->flag)) {
+		PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
+		ns = skb->data[i] >> 1;
+		nr = (skb->data[i + 1] >> 1) & 0x7f;
+	} else {
+		PollFlag = (skb->data[i] & 0x10);
+		ns = (skb->data[i] >> 1) & 0x7;
+		nr = (skb->data[i] >> 5) & 0x7;
+	}
+	if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
+		dev_kfree_skb(skb);
+		if (PollFlag) enquiry_response(st);
+	} else if (l2->vr == ns) {
+		(l2->vr)++;
+		if (test_bit(FLG_MOD128, &l2->flag))
+			l2->vr %= 128;
+		else
+			l2->vr %= 8;
+		test_and_clear_bit(FLG_REJEXC, &l2->flag);
+
+		if (PollFlag)
+			enquiry_response(st);
+		else
+			test_and_set_bit(FLG_ACK_PEND, &l2->flag);
+		skb_pull(skb, l2headersize(l2, 0));
+		st->l2.l2l3(st, DL_DATA | INDICATION, skb);
+	} else {
+		/* n(s)!=v(r) */
+		dev_kfree_skb(skb);
+		if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
+			if (PollFlag)
+				enquiry_response(st);
+		} else {
+			enquiry_cr(st, REJ, RSP, PollFlag);
+			test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
+		}
+	}
+
+	if (legalnr(st, nr)) {
+		if (!test_bit(FLG_PEER_BUSY, &st->l2.flag) && (fi->state == ST_L2_7)) {
+			if (nr == st->l2.vs) {
+				stop_t200(st, 13);
+				FsmRestartTimer(&st->l2.t203, st->l2.T203,
+						EV_L2_T203, NULL, 7);
+			} else if (nr != st->l2.va)
+				restart_t200(st, 14);
+		}
+		setva(st, nr);
+	} else {
+		nrerrorrecovery(fi);
+		return;
+	}
+
+	if (!skb_queue_empty(&st->l2.i_queue) && (fi->state == ST_L2_7))
+		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+	if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag))
+		enquiry_cr(st, RR, RSP, 0);
+}
+
+static void
+l2_got_tei(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	st->l2.tei = (long) arg;
+
+	if (fi->state == ST_L2_3) {
+		establishlink(fi);
+		test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
+	} else
+		FsmChangeState(fi, ST_L2_4);
+	if (!skb_queue_empty(&st->l2.ui_queue))
+		tx_ui(st);
+}
+
+static void
+l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (test_bit(FLG_LAPD, &st->l2.flag) &&
+	    test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
+	} else if (st->l2.rc == st->l2.N200) {
+		FsmChangeState(fi, ST_L2_4);
+		test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
+		skb_queue_purge(&st->l2.i_queue);
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'G');
+		if (test_bit(FLG_LAPB, &st->l2.flag))
+			st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
+		st5_dl_release_l2l3(st);
+	} else {
+		st->l2.rc++;
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
+		send_uframe(st, (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM)
+			    | 0x10, CMD);
+	}
+}
+
+static void
+l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (test_bit(FLG_LAPD, &st->l2.flag) &&
+	    test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
+	} else if (st->l2.rc == st->l2.N200) {
+		FsmChangeState(fi, ST_L2_4);
+		test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'H');
+		lapb_dl_release_l2l3(st, CONFIRM);
+	} else {
+		st->l2.rc++;
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200,
+			    NULL, 9);
+		send_uframe(st, DISC | 0x10, CMD);
+	}
+}
+
+static void
+l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (test_bit(FLG_LAPD, &st->l2.flag) &&
+	    test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
+		return;
+	}
+	test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
+	st->l2.rc = 0;
+	FsmChangeState(fi, ST_L2_8);
+
+	transmit_enquiry(st);
+	st->l2.rc++;
+}
+
+static void
+l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (test_bit(FLG_LAPD, &st->l2.flag) &&
+	    test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
+		return;
+	}
+	test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
+	if (st->l2.rc == st->l2.N200) {
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'I');
+		establishlink(fi);
+		test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
+	} else {
+		transmit_enquiry(st);
+		st->l2.rc++;
+	}
+}
+
+static void
+l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (test_bit(FLG_LAPD, &st->l2.flag) &&
+	    test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
+		FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 9);
+		return;
+	}
+	FsmChangeState(fi, ST_L2_8);
+	transmit_enquiry(st);
+	st->l2.rc = 0;
+}
+
+static void
+l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb;
+	struct Layer2 *l2 = &st->l2;
+	u_char header[MAX_HEADER_LEN];
+	int i, hdr_space_needed;
+	int unsigned p1;
+	u_long flags;
+
+	if (!cansend(st))
+		return;
+
+	skb = skb_dequeue(&l2->i_queue);
+	if (!skb)
+		return;
+
+	hdr_space_needed = l2headersize(l2, 0);
+	if (hdr_space_needed > skb_headroom(skb)) {
+		struct sk_buff *orig_skb = skb;
+
+		skb = skb_realloc_headroom(skb, hdr_space_needed);
+		if (!skb) {
+			dev_kfree_skb(orig_skb);
+			return;
+		}
+	}
+	spin_lock_irqsave(&l2->lock, flags);
+	if (test_bit(FLG_MOD128, &l2->flag))
+		p1 = (l2->vs - l2->va) % 128;
+	else
+		p1 = (l2->vs - l2->va) % 8;
+	p1 = (p1 + l2->sow) % l2->window;
+	if (l2->windowar[p1]) {
+		printk(KERN_WARNING "isdnl2 try overwrite ack queue entry %d\n",
+		       p1);
+		dev_kfree_skb(l2->windowar[p1]);
+	}
+	l2->windowar[p1] = skb_clone(skb, GFP_ATOMIC);
+
+	i = sethdraddr(&st->l2, header, CMD);
+
+	if (test_bit(FLG_MOD128, &l2->flag)) {
+		header[i++] = l2->vs << 1;
+		header[i++] = l2->vr << 1;
+		l2->vs = (l2->vs + 1) % 128;
+	} else {
+		header[i++] = (l2->vr << 5) | (l2->vs << 1);
+		l2->vs = (l2->vs + 1) % 8;
+	}
+	spin_unlock_irqrestore(&l2->lock, flags);
+	memcpy(skb_push(skb, i), header, i);
+	st->l2.l2l1(st, PH_PULL | INDICATION, skb);
+	test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
+	if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) {
+		FsmDelTimer(&st->l2.t203, 13);
+		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11);
+	}
+	if (!skb_queue_empty(&l2->i_queue) && cansend(st))
+		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+}
+
+static void
+l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+	int PollFlag, rsp, rnr = 0;
+	unsigned int nr;
+	struct Layer2 *l2 = &st->l2;
+
+	rsp = *skb->data & 0x2;
+	if (test_bit(FLG_ORIG, &l2->flag))
+		rsp = !rsp;
+
+	skb_pull(skb, l2addrsize(l2));
+
+	if (IsRNR(skb->data, st)) {
+		set_peer_busy(l2);
+		rnr = 1;
+	} else
+		clear_peer_busy(l2);
+
+	if (test_bit(FLG_MOD128, &l2->flag)) {
+		PollFlag = (skb->data[1] & 0x1) == 0x1;
+		nr = skb->data[1] >> 1;
+	} else {
+		PollFlag = (skb->data[0] & 0x10);
+		nr = (skb->data[0] >> 5) & 0x7;
+	}
+	dev_kfree_skb(skb);
+
+	if (rsp && PollFlag) {
+		if (legalnr(st, nr)) {
+			if (rnr) {
+				restart_t200(st, 15);
+			} else {
+				stop_t200(st, 16);
+				FsmAddTimer(&l2->t203, l2->T203,
+					    EV_L2_T203, NULL, 5);
+				setva(st, nr);
+			}
+			invoke_retransmission(st, nr);
+			FsmChangeState(fi, ST_L2_7);
+			if (!skb_queue_empty(&l2->i_queue) && cansend(st))
+				st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
+		} else
+			nrerrorrecovery(fi);
+	} else {
+		if (!rsp && PollFlag)
+			enquiry_response(st);
+		if (legalnr(st, nr)) {
+			setva(st, nr);
+		} else
+			nrerrorrecovery(fi);
+	}
+}
+
+static void
+l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+	struct sk_buff *skb = arg;
+
+	skb_pull(skb, l2addrsize(&st->l2) + 1);
+
+	if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) ||		/* I or S */
+	    (IsUA(skb->data) && (fi->state == ST_L2_7))) {
+		st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K');
+		establishlink(fi);
+		test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
+	}
+	dev_kfree_skb(skb);
+}
+
+static void
+l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.ui_queue);
+	st->l2.tei = -1;
+	FsmChangeState(fi, ST_L2_1);
+}
+
+static void
+l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.ui_queue);
+	st->l2.tei = -1;
+	st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
+	FsmChangeState(fi, ST_L2_1);
+}
+
+static void
+l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	skb_queue_purge(&st->l2.ui_queue);
+	freewin(st);
+	st->l2.tei = -1;
+	stop_t200(st, 17);
+	st5_dl_release_l2l3(st);
+	FsmChangeState(fi, ST_L2_1);
+}
+
+static void
+l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.ui_queue);
+	st->l2.tei = -1;
+	stop_t200(st, 18);
+	st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
+	FsmChangeState(fi, ST_L2_1);
+}
+
+static void
+l2_tei_remove(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	skb_queue_purge(&st->l2.ui_queue);
+	freewin(st);
+	st->l2.tei = -1;
+	stop_t200(st, 17);
+	FsmDelTimer(&st->l2.t203, 19);
+	st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
+	FsmChangeState(fi, ST_L2_1);
+}
+
+static void
+l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	skb_queue_purge(&st->l2.ui_queue);
+	if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
+		st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
+}
+
+static void
+l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	skb_queue_purge(&st->l2.ui_queue);
+	freewin(st);
+	stop_t200(st, 19);
+	st5_dl_release_l2l3(st);
+	FsmChangeState(fi, ST_L2_4);
+}
+
+static void
+l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.ui_queue);
+	stop_t200(st, 20);
+	st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
+	FsmChangeState(fi, ST_L2_4);
+}
+
+static void
+l2_persistent_da(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	skb_queue_purge(&st->l2.i_queue);
+	skb_queue_purge(&st->l2.ui_queue);
+	freewin(st);
+	stop_t200(st, 19);
+	FsmDelTimer(&st->l2.t203, 19);
+	st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
+	FsmChangeState(fi, ST_L2_4);
+}
+
+static void
+l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) {
+		enquiry_cr(st, RNR, RSP, 0);
+		test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
+	}
+}
+
+static void
+l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	if (!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) {
+		enquiry_cr(st, RR, RSP, 0);
+		test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
+	}
+}
+
+static void
+l2_frame_error(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	st->ma.layer(st, MDL_ERROR | INDICATION, arg);
+}
+
+static void
+l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
+{
+	struct PStack *st = fi->userdata;
+
+	st->ma.layer(st, MDL_ERROR | INDICATION, arg);
+	establishlink(fi);
+	test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
+}
+
+static struct FsmNode L2FnList[] __initdata =
+{
+	{ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
+	{ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
+	{ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
+	{ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
+	{ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
+	{ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
+	{ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
+	{ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
+	{ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
+	{ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
+	{ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
+	{ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
+	{ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
+	{ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign},
+	{ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui},
+	{ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui},
+	{ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui},
+	{ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui},
+	{ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui},
+	{ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui},
+	{ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui},
+	{ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
+	{ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
+	{ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
+	{ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
+	{ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
+	{ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
+	{ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
+	{ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
+	{ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
+	{ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
+	{ST_L2_4, EV_L2_SABME, l2_start_multi},
+	{ST_L2_5, EV_L2_SABME, l2_send_UA},
+	{ST_L2_6, EV_L2_SABME, l2_send_DM},
+	{ST_L2_7, EV_L2_SABME, l2_restart_multi},
+	{ST_L2_8, EV_L2_SABME, l2_restart_multi},
+	{ST_L2_4, EV_L2_DISC, l2_send_DM},
+	{ST_L2_5, EV_L2_DISC, l2_send_DM},
+	{ST_L2_6, EV_L2_DISC, l2_send_UA},
+	{ST_L2_7, EV_L2_DISC, l2_stop_multi},
+	{ST_L2_8, EV_L2_DISC, l2_stop_multi},
+	{ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
+	{ST_L2_5, EV_L2_UA, l2_connected},
+	{ST_L2_6, EV_L2_UA, l2_released},
+	{ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
+	{ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
+	{ST_L2_4, EV_L2_DM, l2_reestablish},
+	{ST_L2_5, EV_L2_DM, l2_st5_dm_release},
+	{ST_L2_6, EV_L2_DM, l2_st6_dm_release},
+	{ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
+	{ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
+	{ST_L2_1, EV_L2_UI, l2_got_ui},
+	{ST_L2_2, EV_L2_UI, l2_got_ui},
+	{ST_L2_3, EV_L2_UI, l2_got_ui},
+	{ST_L2_4, EV_L2_UI, l2_got_ui},
+	{ST_L2_5, EV_L2_UI, l2_got_ui},
+	{ST_L2_6, EV_L2_UI, l2_got_ui},
+	{ST_L2_7, EV_L2_UI, l2_got_ui},
+	{ST_L2_8, EV_L2_UI, l2_got_ui},
+	{ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
+	{ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
+	{ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
+	{ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
+	{ST_L2_7, EV_L2_I, l2_got_iframe},
+	{ST_L2_8, EV_L2_I, l2_got_iframe},
+	{ST_L2_5, EV_L2_T200, l2_st5_tout_200},
+	{ST_L2_6, EV_L2_T200, l2_st6_tout_200},
+	{ST_L2_7, EV_L2_T200, l2_st7_tout_200},
+	{ST_L2_8, EV_L2_T200, l2_st8_tout_200},
+	{ST_L2_7, EV_L2_T203, l2_st7_tout_203},
+	{ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
+	{ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
+	{ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
+	{ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
+	{ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
+	{ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
+	{ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
+	{ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
+	{ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
+	{ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
+	{ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da},
+	{ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
+	{ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
+	{ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da},
+	{ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
+	{ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
+	{ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
+	{ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
+};
+
+static void
+isdnl2_l1l2(struct PStack *st, int pr, void *arg)
+{
+	struct sk_buff *skb = arg;
+	u_char *datap;
+	int ret = 1, len;
+	int c = 0;
+
+	switch (pr) {
+	case (PH_DATA | INDICATION):
+		datap = skb->data;
+		len = l2addrsize(&st->l2);
+		if (skb->len > len)
+			datap += len;
+		else {
+			FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N');
+			dev_kfree_skb(skb);
+			return;
+		}
+		if (!(*datap & 1)) {	/* I-Frame */
+			if (!(c = iframe_error(st, skb)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb);
+		} else if (IsSFrame(datap, st)) {	/* S-Frame */
+			if (!(c = super_error(st, skb)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb);
+		} else if (IsUI(datap)) {
+			if (!(c = UI_error(st, skb)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb);
+		} else if (IsSABME(datap, st)) {
+			if (!(c = unnum_error(st, skb, CMD)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb);
+		} else if (IsUA(datap)) {
+			if (!(c = unnum_error(st, skb, RSP)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb);
+		} else if (IsDISC(datap)) {
+			if (!(c = unnum_error(st, skb, CMD)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb);
+		} else if (IsDM(datap)) {
+			if (!(c = unnum_error(st, skb, RSP)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb);
+		} else if (IsFRMR(datap)) {
+			if (!(c = FRMR_error(st, skb)))
+				ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb);
+		} else {
+			FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L');
+			dev_kfree_skb(skb);
+			ret = 0;
+		}
+		if (c) {
+			dev_kfree_skb(skb);
+			FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
+			ret = 0;
+		}
+		if (ret)
+			dev_kfree_skb(skb);
+		break;
+	case (PH_PULL | CONFIRM):
+		FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg);
+		break;
+	case (PH_PAUSE | INDICATION):
+		test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag);
+		break;
+	case (PH_PAUSE | CONFIRM):
+		test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag);
+		break;
+	case (PH_ACTIVATE | CONFIRM):
+	case (PH_ACTIVATE | INDICATION):
+		test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag);
+		if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
+			FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
+		break;
+	case (PH_DEACTIVATE | INDICATION):
+	case (PH_DEACTIVATE | CONFIRM):
+		test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag);
+		FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg);
+		break;
+	default:
+		l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr);
+		break;
+	}
+}
+
+static void
+isdnl2_l3l2(struct PStack *st, int pr, void *arg)
+{
+	switch (pr) {
+	case (DL_DATA | REQUEST):
+		if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) {
+			dev_kfree_skb((struct sk_buff *) arg);
+		}
+		break;
+	case (DL_UNIT_DATA | REQUEST):
+		if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) {
+			dev_kfree_skb((struct sk_buff *) arg);
+		}
+		break;
+	case (DL_ESTABLISH | REQUEST):
+		if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) {
+			if (test_bit(FLG_LAPD, &st->l2.flag) ||
+			    test_bit(FLG_ORIG, &st->l2.flag)) {
+				FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
+			}
+		} else {
+			if (test_bit(FLG_LAPD, &st->l2.flag) ||
+			    test_bit(FLG_ORIG, &st->l2.flag)) {
+				test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag);
+			}
+			st->l2.l2l1(st, PH_ACTIVATE, NULL);
+		}
+		break;
+	case (DL_RELEASE | REQUEST):
+		if (test_bit(FLG_LAPB, &st->l2.flag)) {
+			st->l2.l2l1(st, PH_DEACTIVATE, NULL);
+		}
+		FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg);
+		break;
+	case (MDL_ASSIGN | REQUEST):
+		FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg);
+		break;
+	case (MDL_REMOVE | REQUEST):
+		FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg);
+		break;
+	case (MDL_ERROR | RESPONSE):
+		FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg);
+		break;
+	}
+}
+
+void
+releasestack_isdnl2(struct PStack *st)
+{
+	FsmDelTimer(&st->l2.t200, 21);
+	FsmDelTimer(&st->l2.t203, 16);
+	skb_queue_purge(&st->l2.i_queue);
+	skb_queue_purge(&st->l2.ui_queue);
+	ReleaseWin(&st->l2);
+}
+
+static void
+l2m_debug(struct FsmInst *fi, char *fmt, ...)
+{
+	va_list args;
+	struct PStack *st = fi->userdata;
+
+	va_start(args, fmt);
+	VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args);
+	va_end(args);
+}
+
+void
+setstack_isdnl2(struct PStack *st, char *debug_id)
+{
+	spin_lock_init(&st->l2.lock);
+	st->l1.l1l2 = isdnl2_l1l2;
+	st->l3.l3l2 = isdnl2_l3l2;
+
+	skb_queue_head_init(&st->l2.i_queue);
+	skb_queue_head_init(&st->l2.ui_queue);
+	InitWin(&st->l2);
+	st->l2.debug = 0;
+
+	st->l2.l2m.fsm = &l2fsm;
+	if (test_bit(FLG_LAPB, &st->l2.flag))
+		st->l2.l2m.state = ST_L2_4;
+	else
+		st->l2.l2m.state = ST_L2_1;
+	st->l2.l2m.debug = 0;
+	st->l2.l2m.userdata = st;
+	st->l2.l2m.userint = 0;
+	st->l2.l2m.printdebug = l2m_debug;
+	strcpy(st->l2.debug_id, debug_id);
+
+	FsmInitTimer(&st->l2.l2m, &st->l2.t200);
+	FsmInitTimer(&st->l2.l2m, &st->l2.t203);
+}
+
+static void
+transl2_l3l2(struct PStack *st, int pr, void *arg)
+{
+	switch (pr) {
+	case (DL_DATA | REQUEST):
+	case (DL_UNIT_DATA | REQUEST):
+		st->l2.l2l1(st, PH_DATA | REQUEST, arg);
+		break;
+	case (DL_ESTABLISH | REQUEST):
+		st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL);
+		break;
+	case (DL_RELEASE | REQUEST):
+		st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
+		break;
+	}
+}
+
+void
+setstack_transl2(struct PStack *st)
+{
+	st->l3.l3l2 = transl2_l3l2;
+}
+
+void
+releasestack_transl2(struct PStack *st)
+{
+}
+
+int __init
+Isdnl2New(void)
+{
+	l2fsm.state_count = L2_STATE_COUNT;
+	l2fsm.event_count = L2_EVENT_COUNT;
+	l2fsm.strEvent = strL2Event;
+	l2fsm.strState = strL2State;
+	return FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
+}
+
+void
+Isdnl2Free(void)
+{
+	FsmFree(&l2fsm);
+}