Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2334 insertions, 0 deletions

diff --git a/net/irda/irlap_event.c b/net/irda/irlap_event.c
new file mode 100644
index 00000000000..1cd89f5f3b7
--- /dev/null
+++ b/net/irda/irlap_event.c
@@ -0,0 +1,2334 @@
+/*********************************************************************
+ *
+ * Filename:      irlap_event.c
+ * Version:       0.9
+ * Description:   IrLAP state machine implementation
+ * Status:        Experimental.
+ * Author:        Dag Brattli <dag@brattli.net>
+ * Created at:    Sat Aug 16 00:59:29 1997
+ * Modified at:   Sat Dec 25 21:07:57 1999
+ * Modified by:   Dag Brattli <dag@brattli.net>
+ *
+ *     Copyright (c) 1998-2000 Dag Brattli <dag@brattli.net>,
+ *     Copyright (c) 1998      Thomas Davis <ratbert@radiks.net>
+ *     All Rights Reserved.
+ *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License as
+ *     published by the Free Software Foundation; either version 2 of
+ *     the License, or (at your option) any later version.
+ *
+ *     Neither Dag Brattli nor University of Tromsų admit liability nor
+ *     provide warranty for any of this software. This material is
+ *     provided "AS-IS" and at no charge.
+ *
+ ********************************************************************/
+
+#include <linux/config.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/skbuff.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irlap_event.h>
+
+#include <net/irda/timer.h>
+#include <net/irda/irlap.h>
+#include <net/irda/irlap_frame.h>
+#include <net/irda/qos.h>
+#include <net/irda/parameters.h>
+#include <net/irda/irlmp.h>		/* irlmp_flow_indication(), ... */
+
+#include <net/irda/irda_device.h>
+
+#ifdef CONFIG_IRDA_FAST_RR
+int sysctl_fast_poll_increase = 50;
+#endif
+
+static int irlap_state_ndm    (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_query  (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_reply  (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_conn   (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_setup  (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_xmit_p (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_pclose (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_nrm_p  (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event,
+				  struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_reset  (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_nrm_s  (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_xmit_s (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_sclose (struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info);
+static int irlap_state_reset_check(struct irlap_cb *, IRLAP_EVENT event,
+				   struct sk_buff *, struct irlap_info *);
+
+#ifdef CONFIG_IRDA_DEBUG
+static const char *irlap_event[] = {
+	"DISCOVERY_REQUEST",
+	"CONNECT_REQUEST",
+	"CONNECT_RESPONSE",
+	"DISCONNECT_REQUEST",
+	"DATA_REQUEST",
+	"RESET_REQUEST",
+	"RESET_RESPONSE",
+	"SEND_I_CMD",
+	"SEND_UI_FRAME",
+	"RECV_DISCOVERY_XID_CMD",
+	"RECV_DISCOVERY_XID_RSP",
+	"RECV_SNRM_CMD",
+	"RECV_TEST_CMD",
+	"RECV_TEST_RSP",
+	"RECV_UA_RSP",
+	"RECV_DM_RSP",
+	"RECV_RD_RSP",
+	"RECV_I_CMD",
+	"RECV_I_RSP",
+	"RECV_UI_FRAME",
+	"RECV_FRMR_RSP",
+	"RECV_RR_CMD",
+	"RECV_RR_RSP",
+	"RECV_RNR_CMD",
+	"RECV_RNR_RSP",
+	"RECV_REJ_CMD",
+	"RECV_REJ_RSP",
+	"RECV_SREJ_CMD",
+	"RECV_SREJ_RSP",
+	"RECV_DISC_CMD",
+	"SLOT_TIMER_EXPIRED",
+	"QUERY_TIMER_EXPIRED",
+	"FINAL_TIMER_EXPIRED",
+	"POLL_TIMER_EXPIRED",
+	"DISCOVERY_TIMER_EXPIRED",
+	"WD_TIMER_EXPIRED",
+	"BACKOFF_TIMER_EXPIRED",
+	"MEDIA_BUSY_TIMER_EXPIRED",
+};
+#endif	/* CONFIG_IRDA_DEBUG */
+
+const char *irlap_state[] = {
+	"LAP_NDM",
+	"LAP_QUERY",
+	"LAP_REPLY",
+	"LAP_CONN",
+	"LAP_SETUP",
+	"LAP_OFFLINE",
+	"LAP_XMIT_P",
+	"LAP_PCLOSE",
+	"LAP_NRM_P",
+	"LAP_RESET_WAIT",
+	"LAP_RESET",
+	"LAP_NRM_S",
+	"LAP_XMIT_S",
+	"LAP_SCLOSE",
+	"LAP_RESET_CHECK",
+};
+
+static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event,
+		      struct sk_buff *skb, struct irlap_info *info) =
+{
+	irlap_state_ndm,
+	irlap_state_query,
+	irlap_state_reply,
+	irlap_state_conn,
+	irlap_state_setup,
+	irlap_state_offline,
+	irlap_state_xmit_p,
+	irlap_state_pclose,
+	irlap_state_nrm_p,
+	irlap_state_reset_wait,
+	irlap_state_reset,
+	irlap_state_nrm_s,
+	irlap_state_xmit_s,
+	irlap_state_sclose,
+	irlap_state_reset_check,
+};
+
+/*
+ * Function irda_poll_timer_expired (data)
+ *
+ *    Poll timer has expired. Normally we must now send a RR frame to the
+ *    remote device
+ */
+static void irlap_poll_timer_expired(void *data)
+{
+	struct irlap_cb *self = (struct irlap_cb *) data;
+
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+	irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL);
+}
+
+/*
+ * Calculate and set time before we will have to send back the pf bit
+ * to the peer. Use in primary.
+ * Make sure that state is XMIT_P/XMIT_S when calling this function
+ * (and that nobody messed up with the state). - Jean II
+ */
+static void irlap_start_poll_timer(struct irlap_cb *self, int timeout)
+{
+	IRDA_ASSERT(self != NULL, return;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+
+#ifdef CONFIG_IRDA_FAST_RR
+	/*
+	 * Send out the RR frames faster if our own transmit queue is empty, or
+	 * if the peer is busy. The effect is a much faster conversation
+	 */
+	if ((skb_queue_len(&self->txq) == 0) || (self->remote_busy)) {
+		if (self->fast_RR == TRUE) {
+			/*
+			 *  Assert that the fast poll timer has not reached the
+			 *  normal poll timer yet
+			 */
+			if (self->fast_RR_timeout < timeout) {
+				/*
+				 *  FIXME: this should be a more configurable
+				 *         function
+				 */
+				self->fast_RR_timeout +=
+					(sysctl_fast_poll_increase * HZ/1000);
+
+				/* Use this fast(er) timeout instead */
+				timeout = self->fast_RR_timeout;
+			}
+		} else {
+			self->fast_RR = TRUE;
+
+			/* Start with just 0 ms */
+			self->fast_RR_timeout = 0;
+			timeout = 0;
+		}
+	} else
+		self->fast_RR = FALSE;
+
+	IRDA_DEBUG(3, "%s(), timeout=%d (%ld)\n", __FUNCTION__, timeout, jiffies);
+#endif /* CONFIG_IRDA_FAST_RR */
+
+	if (timeout == 0)
+		irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL);
+	else
+		irda_start_timer(&self->poll_timer, timeout, self,
+				 irlap_poll_timer_expired);
+}
+
+/*
+ * Function irlap_do_event (event, skb, info)
+ *
+ *    Rushes through the state machine without any delay. If state == XMIT
+ *    then send queued data frames.
+ */
+void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event,
+		    struct sk_buff *skb, struct irlap_info *info)
+{
+	int ret;
+
+	if (!self || self->magic != LAP_MAGIC)
+		return;
+
+	IRDA_DEBUG(3, "%s(), event = %s, state = %s\n", __FUNCTION__,
+		   irlap_event[event], irlap_state[self->state]);
+
+	ret = (*state[self->state])(self, event, skb, info);
+
+	/*
+	 *  Check if there are any pending events that needs to be executed
+	 */
+	switch (self->state) {
+	case LAP_XMIT_P: /* FALLTHROUGH */
+	case LAP_XMIT_S:
+		/*
+		 * We just received the pf bit and are at the beginning
+		 * of a new LAP transmit window.
+		 * Check if there are any queued data frames, and do not
+		 * try to disconnect link if we send any data frames, since
+		 * that will change the state away form XMIT
+		 */
+		IRDA_DEBUG(2, "%s() : queue len = %d\n", __FUNCTION__,
+			   skb_queue_len(&self->txq));
+
+		if (skb_queue_len(&self->txq)) {
+			/* Prevent race conditions with irlap_data_request() */
+			self->local_busy = TRUE;
+
+			/* Theory of operation.
+			 * We send frames up to when we fill the window or
+			 * reach line capacity. Those frames will queue up
+			 * in the device queue, and the driver will slowly
+			 * send them.
+			 * After each frame that we send, we poll the higher
+			 * layer for more data. It's the right time to do
+			 * that because the link layer need to perform the mtt
+			 * and then send the first frame, so we can afford
+			 * to send a bit of time in kernel space.
+			 * The explicit flow indication allow to minimise
+			 * buffers (== lower latency), to avoid higher layer
+			 * polling via timers (== less context switches) and
+			 * to implement a crude scheduler - Jean II */
+
+			/* Try to send away all queued data frames */
+			while ((skb = skb_dequeue(&self->txq)) != NULL) {
+				/* Send one frame */
+				ret = (*state[self->state])(self, SEND_I_CMD,
+							    skb, NULL);
+				/* Drop reference count.
+				 * It will be increase as needed in
+				 * irlap_send_data_xxx() */
+				kfree_skb(skb);
+
+				/* Poll the higher layers for one more frame */
+				irlmp_flow_indication(self->notify.instance,
+						      FLOW_START);
+
+				if (ret == -EPROTO)
+					break; /* Try again later! */
+			}
+			/* Finished transmitting */
+			self->local_busy = FALSE;
+		} else if (self->disconnect_pending) {
+			self->disconnect_pending = FALSE;
+
+			ret = (*state[self->state])(self, DISCONNECT_REQUEST,
+						    NULL, NULL);
+		}
+		break;
+/*	case LAP_NDM: */
+/*	case LAP_CONN: */
+/*	case LAP_RESET_WAIT: */
+/*	case LAP_RESET_CHECK: */
+	default:
+		break;
+	}
+}
+
+/*
+ * Function irlap_next_state (self, state)
+ *
+ *    Switches state and provides debug information
+ *
+ */
+static inline void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state)
+{
+	/*
+	if (!self || self->magic != LAP_MAGIC)
+		return;
+
+	IRDA_DEBUG(4, "next LAP state = %s\n", irlap_state[state]);
+	*/
+	self->state = state;
+}
+
+/*
+ * Function irlap_state_ndm (event, skb, frame)
+ *
+ *    NDM (Normal Disconnected Mode) state
+ *
+ */
+static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event,
+			   struct sk_buff *skb, struct irlap_info *info)
+{
+	discovery_t *discovery_rsp;
+	int ret = 0;
+
+	IRDA_ASSERT(self != NULL, return -1;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
+
+	switch (event) {
+	case CONNECT_REQUEST:
+		IRDA_ASSERT(self->netdev != NULL, return -1;);
+
+		if (self->media_busy) {
+			/* Note : this will never happen, because we test
+			 * media busy in irlap_connect_request() and
+			 * postpone the event... - Jean II */
+			IRDA_DEBUG(0, "%s(), CONNECT_REQUEST: media busy!\n",
+				   __FUNCTION__);
+
+			/* Always switch state before calling upper layers */
+			irlap_next_state(self, LAP_NDM);
+
+			irlap_disconnect_indication(self, LAP_MEDIA_BUSY);
+		} else {
+			irlap_send_snrm_frame(self, &self->qos_rx);
+
+			/* Start Final-bit timer */
+			irlap_start_final_timer(self, self->final_timeout);
+
+			self->retry_count = 0;
+			irlap_next_state(self, LAP_SETUP);
+		}
+		break;
+	case RECV_SNRM_CMD:
+		/* Check if the frame contains and I field */
+		if (info) {
+			self->daddr = info->daddr;
+			self->caddr = info->caddr;
+
+			irlap_next_state(self, LAP_CONN);
+
+			irlap_connect_indication(self, skb);
+		} else {
+			IRDA_DEBUG(0, "%s(), SNRM frame does not "
+				   "contain an I field!\n", __FUNCTION__);
+		}
+		break;
+	case DISCOVERY_REQUEST:
+		IRDA_ASSERT(info != NULL, return -1;);
+
+		if (self->media_busy) {
+			IRDA_DEBUG(1, "%s(), DISCOVERY_REQUEST: media busy!\n",
+				   __FUNCTION__);
+			/* irlap->log.condition = MEDIA_BUSY; */
+
+			/* This will make IrLMP try again */
+			irlap_discovery_confirm(self, NULL);
+			/* Note : the discovery log is not cleaned up here,
+			 * it will be done in irlap_discovery_request()
+			 * Jean II */
+			return 0;
+		}
+
+		self->S = info->S;
+		self->s = info->s;
+		irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE,
+					       info->discovery);
+		self->frame_sent = FALSE;
+		self->s++;
+
+		irlap_start_slot_timer(self, self->slot_timeout);
+		irlap_next_state(self, LAP_QUERY);
+		break;
+	case RECV_DISCOVERY_XID_CMD:
+		IRDA_ASSERT(info != NULL, return -1;);
+
+		/* Assert that this is not the final slot */
+		if (info->s <= info->S) {
+			self->slot = irlap_generate_rand_time_slot(info->S,
+								   info->s);
+			if (self->slot == info->s) {
+				discovery_rsp = irlmp_get_discovery_response();
+				discovery_rsp->data.daddr = info->daddr;
+
+				irlap_send_discovery_xid_frame(self, info->S,
+							       self->slot,
+							       FALSE,
+							       discovery_rsp);
+				self->frame_sent = TRUE;
+			} else
+				self->frame_sent = FALSE;
+
+			/*
+			 * Go to reply state until end of discovery to
+			 * inhibit our own transmissions. Set the timer
+			 * to not stay forever there... Jean II
+			 */
+			irlap_start_query_timer(self, info->S, info->s);
+			irlap_next_state(self, LAP_REPLY);
+		} else {
+		/* This is the final slot. How is it possible ?
+		 * This would happen is both discoveries are just slightly
+		 * offset (if they are in sync, all packets are lost).
+		 * Most often, all the discovery requests will be received
+		 * in QUERY state (see my comment there), except for the
+		 * last frame that will come here.
+		 * The big trouble when it happen is that active discovery
+		 * doesn't happen, because nobody answer the discoveries
+		 * frame of the other guy, so the log shows up empty.
+		 * What should we do ?
+		 * Not much. It's too late to answer those discovery frames,
+		 * so we just pass the info to IrLMP who will put it in the
+		 * log (and post an event).
+		 * Another cause would be devices that do discovery much
+		 * slower than us, however the latest fixes should minimise
+		 * those cases...
+		 * Jean II
+		 */
+			IRDA_DEBUG(1, "%s(), Receiving final discovery request, missed the discovery slots :-(\n", __FUNCTION__);
+
+			/* Last discovery request -> in the log */
+			irlap_discovery_indication(self, info->discovery);
+		}
+		break;
+	case MEDIA_BUSY_TIMER_EXPIRED:
+		/* A bunch of events may be postponed because the media is
+		 * busy (usually immediately after we close a connection),
+		 * or while we are doing discovery (state query/reply).
+		 * In all those cases, the media busy flag will be cleared
+		 * when it's OK for us to process those postponed events.
+		 * This event is not mentioned in the state machines in the
+		 * IrLAP spec. It's because they didn't consider Ultra and
+		 * postponing connection request is optional.
+		 * Jean II */
+#ifdef CONFIG_IRDA_ULTRA
+		/* Send any pending Ultra frames if any */
+		if (!skb_queue_empty(&self->txq_ultra)) {
+			/* We don't send the frame, just post an event.
+			 * Also, previously this code was in timer.c...
+			 * Jean II */
+			ret = (*state[self->state])(self, SEND_UI_FRAME,
+						    NULL, NULL);
+		}
+#endif /* CONFIG_IRDA_ULTRA */
+		/* Check if we should try to connect.
+		 * This code was previously in irlap_do_event() */
+		if (self->connect_pending) {
+			self->connect_pending = FALSE;
+
+			/* This one *should* not pend in this state, except
+			 * if a socket try to connect and immediately
+			 * disconnect. - clear - Jean II */
+			if (self->disconnect_pending)
+				irlap_disconnect_indication(self, LAP_DISC_INDICATION);
+			else
+				ret = (*state[self->state])(self,
+							    CONNECT_REQUEST,
+							    NULL, NULL);
+			self->disconnect_pending = FALSE;
+		}
+		/* Note : one way to test if this code works well (including
+		 * media busy and small busy) is to create a user space
+		 * application generating an Ultra packet every 3.05 sec (or
+		 * 2.95 sec) and to see how it interact with discovery.
+		 * It's fairly easy to check that no packet is lost, that the
+		 * packets are postponed during discovery and that after
+		 * discovery indication you have a 100ms "gap".
+		 * As connection request and Ultra are now processed the same
+		 * way, this avoid the tedious job of trying IrLAP connection
+		 * in all those cases...
+		 * Jean II */
+		break;
+#ifdef CONFIG_IRDA_ULTRA
+	case SEND_UI_FRAME:
+	{
+		int i;
+		/* Only allowed to repeat an operation twice */
+		for (i=0; ((i<2) && (self->media_busy == FALSE)); i++) {
+			skb = skb_dequeue(&self->txq_ultra);
+			if (skb)
+				irlap_send_ui_frame(self, skb, CBROADCAST,
+						    CMD_FRAME);
+			else
+				break;
+			/* irlap_send_ui_frame() won't increase skb reference
+			 * count, so no dev_kfree_skb() - Jean II */
+		}
+		if (i == 2) {
+			/* Force us to listen 500 ms again */
+			irda_device_set_media_busy(self->netdev, TRUE);
+		}
+		break;
+	}
+	case RECV_UI_FRAME:
+		/* Only accept broadcast frames in NDM mode */
+		if (info->caddr != CBROADCAST) {
+			IRDA_DEBUG(0, "%s(), not a broadcast frame!\n",
+				   __FUNCTION__);
+		} else
+			irlap_unitdata_indication(self, skb);
+		break;
+#endif /* CONFIG_IRDA_ULTRA */
+	case RECV_TEST_CMD:
+		/* Remove test frame header */
+		skb_pull(skb, sizeof(struct test_frame));
+
+		/*
+		 * Send response. This skb will not be sent out again, and
+		 * will only be used to send out the same info as the cmd
+		 */
+		irlap_send_test_frame(self, CBROADCAST, info->daddr, skb);
+		break;
+	case RECV_TEST_RSP:
+		IRDA_DEBUG(0, "%s() not implemented!\n", __FUNCTION__);
+		break;
+	default:
+		IRDA_DEBUG(2, "%s(), Unknown event %s\n", __FUNCTION__,
+			   irlap_event[event]);
+
+		ret = -1;
+		break;
+	}
+	return ret;
+}
+
+/*
+ * Function irlap_state_query (event, skb, info)
+ *
+ *    QUERY state
+ *
+ */
+static int irlap_state_query(struct irlap_cb *self, IRLAP_EVENT event,
+			     struct sk_buff *skb, struct irlap_info *info)
+{
+	int ret = 0;
+
+	IRDA_ASSERT(self != NULL, return -1;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
+
+	switch (event) {
+	case RECV_DISCOVERY_XID_RSP:
+		IRDA_ASSERT(info != NULL, return -1;);
+		IRDA_ASSERT(info->discovery != NULL, return -1;);
+
+		IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__,
+			   info->discovery->data.daddr);
+
+		if (!self->discovery_log) {
+			IRDA_WARNING("%s: discovery log is gone! "
+				     "maybe the discovery timeout has been set"
+				     " to short?\n", __FUNCTION__);
+			break;
+		}
+		hashbin_insert(self->discovery_log,
+			       (irda_queue_t *) info->discovery,
+			       info->discovery->data.daddr, NULL);
+
+		/* Keep state */
+		/* irlap_next_state(self, LAP_QUERY);  */
+
+		break;
+	case RECV_DISCOVERY_XID_CMD:
+		/* Yes, it is possible to receive those frames in this mode.
+		 * Note that most often the last discovery request won't
+		 * occur here but in NDM state (see my comment there).
+		 * What should we do ?
+		 * Not much. We are currently performing our own discovery,
+		 * therefore we can't answer those frames. We don't want
+		 * to change state either. We just pass the info to
+		 * IrLMP who will put it in the log (and post an event).
+		 * Jean II
+		 */
+
+		IRDA_ASSERT(info != NULL, return -1;);
+
+		IRDA_DEBUG(1, "%s(), Receiving discovery request (s = %d) while performing discovery :-(\n", __FUNCTION__, info->s);
+
+		/* Last discovery request ? */
+		if (info->s == 0xff)
+			irlap_discovery_indication(self, info->discovery);
+		break;
+	case SLOT_TIMER_EXPIRED:
+		/*
+		 * Wait a little longer if we detect an incoming frame. This
+		 * is not mentioned in the spec, but is a good thing to do,
+		 * since we want to work even with devices that violate the
+		 * timing requirements.
+		 */
+		if (irda_device_is_receiving(self->netdev) && !self->add_wait) {
+			IRDA_DEBUG(2, "%s(), device is slow to answer, "
+				   "waiting some more!\n", __FUNCTION__);
+			irlap_start_slot_timer(self, msecs_to_jiffies(10));
+			self->add_wait = TRUE;
+			return ret;
+		}
+		self->add_wait = FALSE;
+
+		if (self->s < self->S) {
+			irlap_send_discovery_xid_frame(self, self->S,
+						       self->s, TRUE,
+						       self->discovery_cmd);
+			self->s++;
+			irlap_start_slot_timer(self, self->slot_timeout);
+
+			/* Keep state */
+			irlap_next_state(self, LAP_QUERY);
+		} else {
+			/* This is the final slot! */
+			irlap_send_discovery_xid_frame(self, self->S, 0xff,
+						       TRUE,
+						       self->discovery_cmd);
+
+			/* Always switch state before calling upper layers */
+			irlap_next_state(self, LAP_NDM);
+
+			/*
+			 *  We are now finished with the discovery procedure,
+			 *  so now we must return the results
+			 */
+			irlap_discovery_confirm(self, self->discovery_log);
+
+			/* IrLMP should now have taken care of the log */
+			self->discovery_log = NULL;
+		}
+		break;
+	default:
+		IRDA_DEBUG(2, "%s(), Unknown event %s\n", __FUNCTION__,
+			   irlap_event[event]);
+
+		ret = -1;
+		break;
+	}
+	return ret;
+}
+
+/*
+ * Function irlap_state_reply (self, event, skb, info)
+ *
+ *    REPLY, we have received a XID discovery frame from a device and we
+ *    are waiting for the right time slot to send a response XID frame
+ *
+ */
+static int irlap_state_reply(struct irlap_cb *self, IRLAP_EVENT event,
+			     struct sk_buff *skb, struct irlap_info *info)
+{
+	discovery_t *discovery_rsp;
+	int ret=0;
+
+	IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+	IRDA_ASSERT(self != NULL, return -1;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
+
+	switch (event) {
+	case QUERY_TIMER_EXPIRED:
+		IRDA_DEBUG(0, "%s(), QUERY_TIMER_EXPIRED <%ld>\n",
+			   __FUNCTION__, jiffies);
+		irlap_next_state(self, LAP_NDM);
+		break;
+	case RECV_DISCOVERY_XID_CMD:
+		IRDA_ASSERT(info != NULL, return -1;);
+		/* Last frame? */
+		if (info->s == 0xff) {
+			del_timer(&self->query_timer);
+
+			/* info->log.condition = REMOTE; */
+
+			/* Always switch state before calling upper layers */
+			irlap_next_state(self, LAP_NDM);
+
+			irlap_discovery_indication(self, info->discovery);
+		} else {
+			/* If it's our slot, send our reply */
+			if ((info->s >= self->slot) && (!self->frame_sent)) {
+				discovery_rsp = irlmp_get_discovery_response();
+				discovery_rsp->data.daddr = info->daddr;
+
+				irlap_send_discovery_xid_frame(self, info->S,
+							       self->slot,
+							       FALSE,
+							       discovery_rsp);
+
+				self->frame_sent = TRUE;
+			}
+			/* Readjust our timer to accomodate devices
+			 * doing faster or slower discovery than us...
+			 * Jean II */
+			irlap_start_query_timer(self, info->S, info->s);
+
+			/* Keep state */
+			//irlap_next_state(self, LAP_REPLY);
+		}
+		break;
+	default:
+		IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __FUNCTION__,
+			   event, irlap_event[event]);
+
+		ret = -1;
+		break;
+	}
+	return ret;
+}
+
+/*
+ * Function irlap_state_conn (event, skb, info)
+ *
+ *    CONN, we have received a SNRM command and is waiting for the upper
+ *    layer to accept or refuse connection
+ *
+ */
+static int irlap_state_conn(struct irlap_cb *self, IRLAP_EVENT event,
+			    struct sk_buff *skb, struct irlap_info *info)
+{
+	int ret = 0;
+
+	IRDA_DEBUG(4, "%s(), event=%s\n", __FUNCTION__, irlap_event[ event]);
+
+	IRDA_ASSERT(self != NULL, return -1;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
+
+	switch (event) {
+	case CONNECT_RESPONSE:
+		skb_pull(skb, sizeof(struct snrm_frame));
+
+		IRDA_ASSERT(self->netdev != NULL, return -1;);
+
+		irlap_qos_negotiate(self, skb);
+
+		irlap_initiate_connection_state(self);
+
+		/*
+		 * Applying the parameters now will make sure we change speed
+		 * *after* we have sent the next frame
+		 */
+		irlap_apply_connection_parameters(self, FALSE);
+
+		/*
+		 * Sending this frame will force a speed change after it has
+		 * been sent (i.e. the frame will be sent at 9600).
+		 */
+		irlap_send_ua_response_frame(self, &self->qos_rx);
+
+#if 0
+		/*
+		 * We are allowed to send two frames, but this may increase
+		 * the connect latency, so lets not do it for now.
+		 */
+		/* This is full of good intentions, but doesn't work in
+		 * practice.
+		 * After sending the first UA response, we switch the
+		 * dongle to the negotiated speed, which is usually
+		 * different than 9600 kb/s.
+		 * From there, there is two solutions :
+		 * 1) The other end has received the first UA response :
+		 * it will set up the connection, move to state LAP_NRM_P,
+		 * and will ignore and drop the second UA response.
+		 * Actually, it's even worse : the other side will almost
+		 * immediately send a RR that will likely collide with the
+		 * UA response (depending on negotiated turnaround).
+		 * 2) The other end has not received the first UA response,
+		 * will stay at 9600 and will never see the second UA response.
+		 * Jean II */
+		irlap_send_ua_response_frame(self, &self->qos_rx);
+#endif
+
+		/*
+		 *  The WD-timer could be set to the duration of the P-timer
+		 *  for this case, but it is recommended to use twice the
+		 *  value (note 3 IrLAP p. 60).
+		 */
+		irlap_start_wd_timer(self, self->wd_timeout);
+		irlap_next_state(self, LAP_NRM_S);
+
+		break;
+	case RECV_DISCOVERY_XID_CMD:
+		IRDA_DEBUG(3, "%s(), event RECV_DISCOVER_XID_CMD!\n",
+			   __FUNCTION__);
+		irlap_next_state(self, LAP_NDM);
+
+		break;
+	case DISCONNECT_REQUEST:
+		IRDA_DEBUG(0, "%s(), Disconnect request!\n", __FUNCTION__);
+		irlap_send_dm_frame(self);
+		irlap_next_state( self, LAP_NDM);
+		irlap_disconnect_indication(self, LAP_DISC_INDICATION);
+		break;
+	default:
+		IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __FUNCTION__, 
+			   event, irlap_event[event]);
+
+		ret = -1;
+		break;
+	}
+
+	return ret;
+}
+
+/*
+ * Function irlap_state_setup (event, skb, frame)
+ *
+ *    SETUP state, The local layer has transmitted a SNRM command frame to
+ *    a remote peer layer and is awaiting a reply .
+ *
+ */
+static int irlap_state_setup(struct irlap_cb *self, IRLAP_EVENT event,
+			     struct sk_buff *skb, struct irlap_info *info)
+{
+	int ret = 0;
+
+	IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+	IRDA_ASSERT(self != NULL, return -1;);
+	IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;);
+
+	switch (event) {
+	case FINAL_TIMER_EXPIRED:
+		if (self->retry_count < self->N3) {
+/*
+ *  Perform random backoff, Wait a random number of time units, minimum
+ *  duration half the time taken to transmitt a SNRM frame, maximum duration
+ *  1.5 times the time taken to transmit a SNRM frame. So this time should
+ *  between 15 msecs and 45 msecs.
+ */
+			irlap_start_backoff_timer(self, msecs_to_jiffies(20 +
+						        (jiffies % 30)));
+		} else {
+			/* Always switch state before calling upper layers */
+			irlap_next_state(self, LAP_NDM);
+
+			irlap_disconnect_indication(self, LAP_FOUND_NONE);
+		}
+		break;
+	case BACKOFF_TIMER_EXPIRED:
+		irlap_send_snrm_frame(self, &self->qos_rx);
+		irlap_start_final_timer(self, self->final_timeout);
+		self->retry_count++;
+		break;
+	case RECV_SNRM_CMD:
+		IRDA_DEBUG(4, "%s(), SNRM battle!\n", __FUNCTION__);
+
+		IRDA_ASSERT(skb != NULL, return 0;);
+		IRDA_ASSERT(info != NULL, return 0;);
+
+		/*
+		 *  The device with the largest device address wins the battle
+		 *  (both have sent a SNRM command!)
+		 */
+		if (info &&(info->daddr > self->saddr)) {
+			del_timer(&self->final_timer);
+			irlap_initiate_connection_state(self);
+
+			IRDA_ASSERT(self->netdev != NULL, return -1;);
+
+			skb_pull(skb, sizeof(struct snrm_frame));
+
+			irlap_qos_negotiate(self, skb);
+
+			/* Send UA frame and then change link settings */
+			irlap_apply_connection_parameters(self, FALSE);
+			irlap_send_ua_response_frame(self, &self->qos_rx);
+
+			irlap_next_state(self, LAP_NRM_S);
+			irlap_connect_confirm(self, skb);
+
+			/*
+			 *  The WD-timer could be set to the duration of the
+			 *  P-timer for this case, but it is recommended
+			 *  to use twice the value (note 3 IrLAP p. 60).
+			 */
+			irlap_start_wd_timer(self, self->wd_timeout);
+		} else {
+			/* We just ignore the other device! */
+			irlap_next_state(self, LAP_SETUP);
+		}
+		break;
+	case RECV_UA_RSP:
+		/* Stop F-timer */
+		del_timer(&self->final_timer);
+
+		/* Initiate connection state */
+		irlap_initiate_connection_state(self);
+
+		/* Negotiate connection parameters */
+		IRDA_ASSERT(skb->len > 10, return -1;);
+
+		skb_pull(skb, sizeof(struct ua_frame));
+
+		IRDA_ASSERT(self->netdev != NULL, return -1;);
+
+		irlap_qos_negotiate(self, skb);
+
+		/* Set the new link setting *now* (before the rr frame) */
+		irlap_apply_connection_parameters(self, TRUE);
+		self->retry_count = 0;
+
+		/* Wait for turnaround time to give a chance to the other
+		 * device to be ready to receive us.
+		 * Note : the time to switch speed is typically larger
+		 * than the turnaround time, but as we don't have the other
+		 * side speed switch time, that's our best guess...
+		 * Jean II */
+		irlap_wait_min_turn_around(self, &self->qos_tx);
+
+		/* This frame will actually be sent at the new speed */
+		irlap_send_rr_frame(self, CMD_FRAME);
+
+		/* The timer is set to half the normal timer to quickly
+		 * detect a failure to negociate the new connection
+		 * parameters. IrLAP 6.11.3.2, note 3.
+		 * Note that currently we don't process this failure
+		 * properly, as we should do a quick disconnect.
+		 * Jean II */
+		irlap_start_final_timer(self, self->final_timeout/2);
+		irlap_next_state(self, LAP_NRM_P);
+
+		irlap_connect_confirm(self, skb);
+		break;
+	case RECV_DM_RSP:     /* FALLTHROUGH */
+	case RECV_DISC_CMD:
+		del_timer(&self->final_timer);
+		irlap_next_state(self, LAP_NDM);
+
+		irlap_disconnect_indication(self, LAP_DISC_INDICATION);
+		break;
+	default:
+		IRDA_DEBUG(1, "%s(), Unknown event %d, %s\n", __FUNCTION__,
+			   event, irlap_event[event]);
+
+		ret = -1;
+		break;
+	}
+	return ret;
+}
+
+/*
+ * Function irlap_state_offline (self, event, skb, info)
+ *
+ *    OFFLINE state, not used for now!
+ *
+ */
+static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event,
+			       struct sk_buff *skb, struct irlap_info *info)
+{
+	IRDA_DEBUG( 0, "%s(), Unknown event\n", __FUNCTION__);
+
+	return -1;
+}
+
+/*
+ * Function irlap_state_xmit_p (self, event, skb, info)
+ *
+ *    XMIT, Only the primary station has right to transmit, and we
+ *    therefore do not expect to receive any transmissions from other
+ *    stations.
+ *
+ */
+static int irlap_state_xmit_p(struct irlap_cb *self, IRLAP_EVENT event,
+			      struct sk_buff *skb, struct irlap_info *info)
+{
+	int ret = 0;
+
+	switch (event) {
+	case SEND_I_CMD:
+		/*
+		 *  Only send frame if send-window > 0.
+		 */
+		if ((self->window > 0) && (!self->remote_busy)) {
+			int nextfit;
+#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
+			struct sk_buff *skb_next;
+
+			/* With DYNAMIC_WINDOW, we keep the window size
+			 * maximum, and adapt on the packets we are sending.
+			 * At 115k, we can send only 2 packets of 2048 bytes
+			 * in a 500 ms turnaround. Without this option, we
+			 * would always limit the window to 2. With this
+			 * option, if we send smaller packets, we can send
+			 * up to 7 of them (always depending on QoS).
+			 * Jean II */
+
+			/* Look at the next skb. This is safe, as we are
+			 * the only consumer of the Tx queue (if we are not,
+			 * we have other problems) - Jean II */
+			skb_next = skb_peek(&self->txq);
+
+			/* Check if a subsequent skb exist and would fit in
+			 * the current window (with respect to turnaround
+			 * time).
+			 * This allow us to properly mark the current packet
+			 * with the pf bit, to avoid falling back on the
+			 * second test below, and avoid waiting the
+			 * end of the window and sending a extra RR.
+			 * Note : (skb_next != NULL) <=> (skb_queue_len() > 0)
+			 * Jean II */
+			nextfit = ((skb_next != NULL) &&
+				   ((skb_next->len + skb->len) <=
+				    self->bytes_left));
+
+			/*
+			 * The current packet may not fit ! Because of test
+			 * above, this should not happen any more !!!
+			 *  Test if we have transmitted more bytes over the
+			 *  link than its possible to do with the current
+			 *  speed and turn-around-time.
+			 */
+			if((!nextfit) && (skb->len > self->bytes_left)) {
+				IRDA_DEBUG(0, "%s(), Not allowed to transmit"
+					   " more bytes!\n", __FUNCTION__);
+				/* Requeue the skb */
+				skb_queue_head(&self->txq, skb_get(skb));
+				/*
+				 *  We should switch state to LAP_NRM_P, but
+				 *  that is not possible since we must be sure
+				 *  that we poll the other side. Since we have
+				 *  used up our time, the poll timer should
+				 *  trigger anyway now, so we just wait for it
+				 *  DB
+				 */
+				/*
+				 * Sorry, but that's not totally true. If
+				 * we send 2000B packets, we may wait another
+				 * 1000B until our turnaround expire. That's
+				 * why we need to be proactive in avoiding
+				 * coming here. - Jean II
+				 */
+				return -EPROTO;
+			}
+
+			/* Substract space used by this skb */
+			self->bytes_left -= skb->len;
+#else	/* CONFIG_IRDA_DYNAMIC_WINDOW */
+			/* Window has been adjusted for the max packet
+			 * size, so much simpler... - Jean II */
+			nextfit = (skb_queue_len(&self->txq) > 0);
+#endif	/* CONFIG_IRDA_DYNAMIC_WINDOW */
+			/*
+			 *  Send data with poll bit cleared only if window > 1
+			 *  and there is more frames after this one to be sent
+			 */
+			if ((self->window > 1) && (nextfit)) {
+				/* More packet to send in current window */
+				irlap_send_data_primary(self, skb);
+				irlap_next_state(self, LAP_XMIT_P);
+			} else {
+