cregit-Linux how code gets into the kernel

Release 4.11 net/irda/irlmp.c

Directory: net/irda
/*********************************************************************
 *
 * Filename:      irlmp.c
 * Version:       1.0
 * Description:   IrDA Link Management Protocol (LMP) layer
 * Status:        Stable.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Aug 17 20:54:32 1997
 * Modified at:   Wed Jan  5 11:26:03 2000
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
 *     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 Tromsø admit liability nor
 *     provide warranty for any of this software. This material is
 *     provided "AS-IS" and at no charge.
 *
 ********************************************************************/

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/random.h>
#include <linux/seq_file.h>

#include <net/irda/irda.h>
#include <net/irda/timer.h>
#include <net/irda/qos.h>
#include <net/irda/irlap.h>
#include <net/irda/iriap.h>
#include <net/irda/irlmp.h>
#include <net/irda/irlmp_frame.h>

#include <asm/unaligned.h>

static __u8 irlmp_find_free_slsap(void);
static int irlmp_slsap_inuse(__u8 slsap_sel);

/* Master structure */

struct irlmp_cb *irlmp = NULL;

/* These can be altered by the sysctl interface */

int  sysctl_discovery         = 0;

int  sysctl_discovery_timeout = 3; 
/* 3 seconds by default */

int  sysctl_discovery_slots   = 6; 
/* 6 slots by default */

int  sysctl_lap_keepalive_time = LM_IDLE_TIMEOUT * 1000 / HZ;

char sysctl_devname[65];


static const char *irlmp_reasons[] = {
	"ERROR, NOT USED",
	"LM_USER_REQUEST",
	"LM_LAP_DISCONNECT",
	"LM_CONNECT_FAILURE",
	"LM_LAP_RESET",
	"LM_INIT_DISCONNECT",
	"ERROR, NOT USED",
	"UNKNOWN",
};




const char *irlmp_reason_str(LM_REASON reason)
{
	reason = min_t(size_t, reason, ARRAY_SIZE(irlmp_reasons) - 1);
	return irlmp_reasons[reason];
}


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/*
 * Function irlmp_init (void)
 *
 *    Create (allocate) the main IrLMP structure
 *
 */



int __init irlmp_init(void)
{
	/* Initialize the irlmp structure. */
	irlmp = kzalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
	if (irlmp == NULL)
		return -ENOMEM;

	irlmp->magic = LMP_MAGIC;

	irlmp->clients = hashbin_new(HB_LOCK);
	irlmp->services = hashbin_new(HB_LOCK);
	irlmp->links = hashbin_new(HB_LOCK);
	irlmp->unconnected_lsaps = hashbin_new(HB_LOCK);
	irlmp->cachelog = hashbin_new(HB_NOLOCK);

	if ((irlmp->clients == NULL) ||
	    (irlmp->services == NULL) ||
	    (irlmp->links == NULL) ||
	    (irlmp->unconnected_lsaps == NULL) ||
	    (irlmp->cachelog == NULL)) {
		return -ENOMEM;
	}

	spin_lock_init(&irlmp->cachelog->hb_spinlock);

	irlmp->last_lsap_sel = 0x0f; /* Reserved 0x00-0x0f */
	strcpy(sysctl_devname, "Linux");

	init_timer(&irlmp->discovery_timer);

	/* Do discovery every 3 seconds, conditionally */
	if (sysctl_discovery)
		irlmp_start_discovery_timer(irlmp,
					    sysctl_discovery_timeout*HZ);

	return 0;
}


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Ross Burton42.22%110.00%


André Goddard Rosa10.56%110.00%


Panagiotis Issaris10.56%110.00%


Total180100.00%10100.00%



/*
 * Function irlmp_cleanup (void)
 *
 *    Remove IrLMP layer
 *
 */



void irlmp_cleanup(void)
{
	/* Check for main structure */
	IRDA_ASSERT(irlmp != NULL, return;);
	IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);

	del_timer(&irlmp->discovery_timer);

	hashbin_delete(irlmp->links, (FREE_FUNC) kfree);
	hashbin_delete(irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
	hashbin_delete(irlmp->clients, (FREE_FUNC) kfree);
	hashbin_delete(irlmp->services, (FREE_FUNC) kfree);
	hashbin_delete(irlmp->cachelog, (FREE_FUNC) kfree);

	/* De-allocate main structure */
	kfree(irlmp);
	irlmp = NULL;
}


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Jean Tourrilhes22.00%133.33%


Total100100.00%3100.00%



/*
 * Function irlmp_open_lsap (slsap, notify)
 *
 *   Register with IrLMP and create a local LSAP,
 *   returns handle to LSAP.
 */



struct lsap_cb *irlmp_open_lsap(__u8 slsap_sel, notify_t *notify, __u8 pid)
{
	struct lsap_cb *self;

	IRDA_ASSERT(notify != NULL, return NULL;);
	IRDA_ASSERT(irlmp != NULL, return NULL;);
	IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return NULL;);
	IRDA_ASSERT(notify->instance != NULL, return NULL;);

	/*  Does the client care which Source LSAP selector it gets?  */
	if (slsap_sel == LSAP_ANY) {
		slsap_sel = irlmp_find_free_slsap();
		if (!slsap_sel)
			return NULL;
	} else if (irlmp_slsap_inuse(slsap_sel))
		return NULL;

	/* Allocate new instance of a LSAP connection */
	self = kzalloc(sizeof(struct lsap_cb), GFP_ATOMIC);
	if (self == NULL)
		return NULL;

	self->magic = LMP_LSAP_MAGIC;
	self->slsap_sel = slsap_sel;

	/* Fix connectionless LSAP's */
	if (slsap_sel == LSAP_CONNLESS) {
#ifdef CONFIG_IRDA_ULTRA
		self->dlsap_sel = LSAP_CONNLESS;
		self->pid = pid;
#endif /* CONFIG_IRDA_ULTRA */
	} else
		self->dlsap_sel = LSAP_ANY;
	/* self->connected = FALSE; -> already NULL via memset() */

	init_timer(&self->watchdog_timer);

	self->notify = *notify;

	self->lsap_state = LSAP_DISCONNECTED;

	/* Insert into queue of unconnected LSAPs */
	hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
		       (long) self, NULL);

	return self;
}

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Linus Torvalds42.02%111.11%


Panagiotis Issaris10.51%111.11%


Total198100.00%9100.00%




EXPORT_SYMBOL(irlmp_open_lsap);

/*
 * Function __irlmp_close_lsap (self)
 *
 *    Remove an instance of LSAP
 */



static void __irlmp_close_lsap(struct lsap_cb *self)
{
	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);

	/*
         *  Set some of the variables to preset values
         */
	self->magic = 0;
	del_timer(&self->watchdog_timer); /* Important! */

	if (self->conn_skb)
		dev_kfree_skb(self->conn_skb);

	kfree(self);
}


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Jean Tourrilhes23.39%133.33%


Total59100.00%3100.00%



/*
 * Function irlmp_close_lsap (self)
 *
 *    Close and remove LSAP
 *
 */



void irlmp_close_lsap(struct lsap_cb *self)
{
	struct lap_cb *lap;
	struct lsap_cb *lsap = NULL;

	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);

	/*
         *  Find out if we should remove this LSAP from a link or from the
         *  list of unconnected lsaps (not associated with a link)
         */
	lap = self->lap;
	if (lap) {
		IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
		/* We might close a LSAP before it has completed the
                 * connection setup. In those case, higher layers won't
                 * send a proper disconnect request. Harmless, except
                 * that we will forget to close LAP... - Jean II */
		if(self->lsap_state != LSAP_DISCONNECTED) {
			self->lsap_state = LSAP_DISCONNECTED;
			irlmp_do_lap_event(self->lap,
					   LM_LAP_DISCONNECT_REQUEST, NULL);
		}
		/* Now, remove from the link */
		lsap = hashbin_remove(lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
		lap->cache.valid = FALSE;
#endif
	}
	self->lap = NULL;
	/* Check if we found the LSAP! If not then try the unconnected lsaps */
	if (!lsap) {
		lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
				      NULL);
	}
	if (!lsap) {
		pr_debug("%s(), Looks like somebody has removed me already!\n",
			 __func__);
		return;
	}
	__irlmp_close_lsap(self);
}

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Jean Tourrilhes4929.88%550.00%


Linus Torvalds63.66%110.00%


Harvey Harrison10.61%110.00%


Joe Perches10.61%110.00%


Total164100.00%10100.00%




EXPORT_SYMBOL(irlmp_close_lsap);

/*
 * Function irlmp_register_irlap (saddr, notify)
 *
 *    Register IrLAP layer with IrLMP. There is possible to have multiple
 *    instances of the IrLAP layer, each connected to different IrDA ports
 *
 */



void irlmp_register_link(struct irlap_cb *irlap, __u32 saddr, notify_t *notify)
{
	struct lap_cb *lap;

	IRDA_ASSERT(irlmp != NULL, return;);
	IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
	IRDA_ASSERT(notify != NULL, return;);

	/*
         *  Allocate new instance of a LSAP connection
         */
	lap = kzalloc(sizeof(struct lap_cb), GFP_KERNEL);
	if (lap == NULL)
		return;

	lap->irlap = irlap;
	lap->magic = LMP_LAP_MAGIC;
	lap->saddr = saddr;
	lap->daddr = DEV_ADDR_ANY;
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
	lap->cache.valid = FALSE;
#endif
	lap->lsaps = hashbin_new(HB_LOCK);
	if (lap->lsaps == NULL) {
		net_warn_ratelimited("%s(), unable to kmalloc lsaps\n",
				     __func__);
		kfree(lap);
		return;
	}

	lap->lap_state = LAP_STANDBY;

	init_timer(&lap->idle_timer);

	/*
         *  Insert into queue of LMP links
         */
	hashbin_insert(irlmp->links, (irda_queue_t *) lap, lap->saddr, NULL);

	/*
         *  We set only this variable so IrLAP can tell us on which link the
         *  different events happened on
         */
	irda_notify_init(notify);
	notify->instance = lap;
}


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Linus Torvalds (pre-git)12670.39%433.33%


Jean Tourrilhes4625.70%325.00%


Linus Torvalds31.68%18.33%


Martin Dalecki10.56%18.33%


Harvey Harrison10.56%18.33%


Joe Perches10.56%18.33%


Panagiotis Issaris10.56%18.33%


Total179100.00%12100.00%



/*
 * Function irlmp_unregister_irlap (saddr)
 *
 *    IrLAP layer has been removed!
 *
 */



void irlmp_unregister_link(__u32 saddr)
{
	struct lap_cb *link;

	/* We must remove ourselves from the hashbin *first*. This ensure
         * that no more LSAPs will be open on this link and no discovery
         * will be triggered anymore. Jean II */
	link = hashbin_remove(irlmp->links, saddr, NULL);
	if (link) {
		IRDA_ASSERT(link->magic == LMP_LAP_MAGIC, return;);

		/* Kill all the LSAPs on this link. Jean II */
		link->reason = LAP_DISC_INDICATION;
		link->daddr = DEV_ADDR_ANY;
		irlmp_do_lap_event(link, LM_LAP_DISCONNECT_INDICATION, NULL);

		/* Remove all discoveries discovered at this link */
		irlmp_expire_discoveries(irlmp->cachelog, link->saddr, TRUE);

		/* Final cleanup */
		del_timer(&link->idle_timer);
		link->magic = 0;
		hashbin_delete(link->lsaps, (FREE_FUNC) __irlmp_close_lsap);
		kfree(link);
	}
}


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Total108100.00%6100.00%



/*
 * Function irlmp_connect_request (handle, dlsap, userdata)
 *
 *    Connect with a peer LSAP
 *
 */



int irlmp_connect_request(struct lsap_cb *self, __u8 dlsap_sel,
			  __u32 saddr, __u32 daddr,
			  struct qos_info *qos, struct sk_buff *userdata)
{
	struct sk_buff *tx_skb = userdata;
	struct lap_cb *lap;
	struct lsap_cb *lsap;
	int ret;

	IRDA_ASSERT(self != NULL, return -EBADR;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EBADR;);

	pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n",
		 __func__, self->slsap_sel, dlsap_sel, saddr, daddr);

	if (test_bit(0, &self->connected)) {
		ret = -EISCONN;
		goto err;
	}

	/* Client must supply destination device address */
	if (!daddr) {
		ret = -EINVAL;
		goto err;
	}

	/* Any userdata? */
	if (tx_skb == NULL) {
		tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
		if (!tx_skb)
			return -ENOMEM;

		skb_reserve(tx_skb, LMP_MAX_HEADER);
	}

	/* Make room for MUX control header (3 bytes) */
	IRDA_ASSERT(skb_headroom(tx_skb) >= LMP_CONTROL_HEADER, return -1;);
	skb_push(tx_skb, LMP_CONTROL_HEADER);

	self->dlsap_sel = dlsap_sel;

	/*
         * Find the link to where we should try to connect since there may
         * be more than one IrDA port on this machine. If the client has
         * passed us the saddr (and already knows which link to use), then
         * we use that to find the link, if not then we have to look in the
         * discovery log and check if any of the links has discovered a
         * device with the given daddr
         */
	if ((!saddr) || (saddr == DEV_ADDR_ANY)) {
		discovery_t *discovery;
		unsigned long flags;

		spin_lock_irqsave(&irlmp->cachelog->hb_spinlock, flags);
		if (daddr != DEV_ADDR_ANY)
			discovery = hashbin_find(irlmp->cachelog, daddr, NULL);
		else {
			pr_debug("%s(), no daddr\n", __func__);
			discovery = (discovery_t *)
				hashbin_get_first(irlmp->cachelog);
		}

		if (discovery) {
			saddr = discovery->data.saddr;
			daddr = discovery->data.daddr;
		}
		spin_unlock_irqrestore(&irlmp->cachelog->hb_spinlock, flags);
	}
	lap = hashbin_lock_find(irlmp->links, saddr, NULL);
	if (lap == NULL) {
		pr_debug("%s(), Unable to find a usable link!\n", __func__);
		ret = -EHOSTUNREACH;
		goto err;
	}

	/* Check if LAP is disconnected or already connected */
	if (lap->daddr == DEV_ADDR_ANY)
		lap->daddr = daddr;
	else if (lap->daddr != daddr) {
		/* Check if some LSAPs are active on this LAP */
		if (HASHBIN_GET_SIZE(lap->lsaps) == 0) {
			/* No active connection, but LAP hasn't been
                         * disconnected yet (waiting for timeout in LAP).
                         * Maybe we could give LAP a bit of help in this case.
                         */
			pr_debug("%s(), sorry, but I'm waiting for LAP to timeout!\n",
				 __func__);
			ret = -EAGAIN;
			goto err;
		}

		/* LAP is already connected to a different node, and LAP
                 * can only talk to one node at a time */
		pr_debug("%s(), sorry, but link is busy!\n", __func__);
		ret = -EBUSY;
		goto err;
	}

	self->lap = lap;

	/*
         *  Remove LSAP from list of unconnected LSAPs and insert it into the
         *  list of connected LSAPs for the particular link
         */
	lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self, NULL);

	IRDA_ASSERT(lsap != NULL, return -1;);
	IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
	IRDA_ASSERT(lsap->lap != NULL, return -1;);
	IRDA_ASSERT(lsap->lap->magic == LMP_LAP_MAGIC, return -1;);

	hashbin_insert(self->lap->lsaps, (irda_queue_t *) self, (long) self,
		       NULL);

	set_bit(0, &self->connected);	/* TRUE */

	/*
         *  User supplied qos specifications?
         */
	if (qos)
		self->qos = *qos;

	irlmp_do_lsap_event(self, LM_CONNECT_REQUEST, tx_skb);

	/* Drop reference count - see irlap_data_request(). */
	dev_kfree_skb(tx_skb);

	return 0;

err:
	/* Cleanup */
	if(tx_skb)
		dev_kfree_skb(tx_skb);
	return ret;
}

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Jean Tourrilhes12723.87%630.00%


Linus Torvalds213.95%210.00%


Harvey Harrison50.94%15.00%


Joe Perches50.94%15.00%


Samuel Ortiz40.75%210.00%


Martin Dalecki20.38%15.00%


Total532100.00%20100.00%




EXPORT_SYMBOL(irlmp_connect_request);

/*
 * Function irlmp_connect_indication (self)
 *
 *    Incoming connection
 *
 */



void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb)
{
	int max_seg_size;
	int lap_header_size;
	int max_header_size;

	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
	IRDA_ASSERT(skb != NULL, return;);
	IRDA_ASSERT(self->lap != NULL, return;);

	pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
		 __func__, self->slsap_sel, self->dlsap_sel);

	/* Note : self->lap is set in irlmp_link_data_indication(),
         * (case CONNECT_CMD:) because we have no way to set it here.
         * Similarly, self->dlsap_sel is usually set in irlmp_find_lsap().
         * Jean II */

	self->qos = *self->lap->qos;

	max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
	lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
	max_header_size = LMP_HEADER + lap_header_size;

	/* Hide LMP_CONTROL_HEADER header from layer above */
	skb_pull(skb, LMP_CONTROL_HEADER);

	if (self->notify.connect_indication) {
		/* Don't forget to refcount it - see irlap_driver_rcv(). */
		skb_get(skb);
		self->notify.connect_indication(self->notify.instance, self,
						&self->qos, max_seg_size,
						max_header_size, skb);
	}
}


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Linus Torvalds10.62%110.00%


Harvey Harrison10.62%110.00%


Total160100.00%10100.00%



/*
 * Function irlmp_connect_response (handle, userdata)
 *
 *    Service user is accepting connection
 *
 */



int irlmp_connect_response(struct lsap_cb *self, struct sk_buff *userdata)
{
	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
	IRDA_ASSERT(userdata != NULL, return -1;);

	/* We set the connected bit and move the lsap to the connected list
         * in the state machine itself. Jean II */

	pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
		 __func__, self->slsap_sel, self->dlsap_sel);

	/* Make room for MUX control header (3 bytes) */
	IRDA_ASSERT(skb_headroom(userdata) >= LMP_CONTROL_HEADER, return -1;);
	skb_push(userdata, LMP_CONTROL_HEADER);

	irlmp_do_lsap_event(self, LM_CONNECT_RESPONSE, userdata);

	/* Drop reference count - see irlap_data_request(). */
	dev_kfree_skb(userdata);

	return 0;
}

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Total93100.00%10100.00%




EXPORT_SYMBOL(irlmp_connect_response);

/*
 * Function irlmp_connect_confirm (handle, skb)
 *
 *    LSAP connection confirmed peer device!
 */



void irlmp_connect_confirm(struct lsap_cb *self, struct sk_buff *skb)
{
	int max_header_size;
	int lap_header_size;
	int max_seg_size;

	IRDA_ASSERT(skb != NULL, return;);
	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
	IRDA_ASSERT(self->lap != NULL, return;);

	self->qos = *self->lap->qos;

	max_seg_size    = self->lap->qos->data_size.value-LMP_HEADER;
	lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
	max_header_size = LMP_HEADER + lap_header_size;

	pr_debug("%s(), max_header_size=%d\n",
		 __func__, max_header_size);

	/* Hide LMP_CONTROL_HEADER header from layer above */
	skb_pull(skb, LMP_CONTROL_HEADER);

	if (self->notify.connect_confirm) {
		/* Don't forget to refcount it - see irlap_driver_rcv() */
		skb_get(skb);
		self->notify.connect_confirm(self->notify.instance, self,
					     &self->qos, max_seg_size,
					     max_header_size, skb);
	}
}


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Jean Tourrilhes127.84%330.00%


Harvey Harrison10.65%110.00%


Joe Perches10.65%110.00%


Total153100.00%10100.00%



/*
 * Function irlmp_dup (orig, instance)
 *
 *    Duplicate LSAP, can be used by servers to confirm a connection on a
 *    new LSAP so it can keep listening on the old one.
 *
 */



struct lsap_cb *irlmp_dup(struct lsap_cb *orig, void *instance)
{
	struct lsap_cb *new;
	unsigned long flags;

	spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);

	/* Only allowed to duplicate unconnected LSAP's, and only LSAPs
         * that have received a connect indication. Jean II */
	if ((!hashbin_find(irlmp->unconnected_lsaps, (long) orig, NULL)) ||
	    (orig->lap == NULL)) {
		pr_debug("%s(), invalid LSAP (wrong state)\n",
			 __func__);
		spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
				       flags);
		return NULL;
	}

	/* Allocate a new instance */
	new = kmemdup(orig, sizeof(*new), GFP_ATOMIC);
	if (!new)  {
		pr_debug("%s(), unable to kmalloc\n", __func__);
		spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
				       flags);
		return NULL;
	}
	/* new->lap = orig->lap; => done in the memcpy() */
	/* new->slsap_sel = orig->slsap_sel; => done in the memcpy() */
	new->conn_skb = NULL;

	spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);

	/* Not everything is the same */
	new->notify.instance = instance;

	init_timer(&new->watchdog_timer);

	hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) new,
		       (long) new, NULL);

#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
	/* Make sure that we invalidate the LSAP cache */
	new->lap->cache.valid = FALSE;
#endif /* CONFIG_IRDA_CACHE_LAST_LSAP */

	return new;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11956.40%218.18%


Jean Tourrilhes8339.34%654.55%


Arnaldo Carvalho de Melo52.37%19.09%


Harvey Harrison20.95%19.09%


Joe Perches20.95%19.09%


Total211100.00%11100.00%



/*
 * Function irlmp_disconnect_request (handle, userdata)
 *
 *    The service user is requesting disconnection, this will not remove the
 *    LSAP, but only mark it as disconnected
 */



int irlmp_disconnect_request(struct lsap_cb *self, struct sk_buff *userdata)
{
	struct lsap_cb *lsap;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
	IRDA_ASSERT(userdata != NULL, return -1;);

	/* Already disconnected ?
         * There is a race condition between irlmp_disconnect_indication()
         * and us that might mess up the hashbins below. This fixes it.
         * Jean II */
	if (! test_and_clear_bit(0, &self->connected)) {
		pr_debug("%s(), already disconnected!\n", __func__);
		dev_kfree_skb(userdata);
		return -1;
	}

	skb_push(userdata, LMP_CONTROL_HEADER);

	/*
         *  Do the event before the other stuff since we must know
         *  which lap layer that the frame should be transmitted on
         */
	irlmp_do_lsap_event(self, LM_DISCONNECT_REQUEST, userdata);

	/* Drop reference count - see irlap_data_request(). */
	dev_kfree_skb(userdata);

	/*
         *  Remove LSAP from list of connected LSAPs for the particular link
         *  and insert it into the list of unconnected LSAPs
         */
	IRDA_ASSERT(self->lap != NULL, return -1;);
	IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
	IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);

	lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
	self->lap->cache.valid = FALSE;
#endif

	IRDA_ASSERT(lsap != NULL, return -1;);
	IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
	IRDA_ASSERT(lsap == self, return -1;);

	hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
		       (long) self, NULL);

	/* Reset some values */
	self->dlsap_sel = LSAP_ANY;
	self->lap = NULL;

	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16874.34%430.77%


Jean Tourrilhes3415.04%538.46%


Linus Torvalds208.85%17.69%


Martin Dalecki20.88%17.69%


Joe Perches10.44%17.69%


Harvey Harrison10.44%17.69%


Total226100.00%13100.00%




EXPORT_SYMBOL(irlmp_disconnect_request);

/*
 * Function irlmp_disconnect_indication (reason, userdata)
 *
 *    LSAP is being closed!
 */



void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
				 struct sk_buff *skb)
{
	struct lsap_cb *lsap;

	pr_debug("%s(), reason=%s [%d]\n", __func__,
		 irlmp_reason_str(reason), reason);
	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);

	pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
		 __func__, self->slsap_sel, self->dlsap_sel);

	/* Already disconnected ?
         * There is a race condition between irlmp_disconnect_request()
         * and us that might mess up the hashbins below. This fixes it.
         * Jean II */
	if (! test_and_clear_bit(0, &self->connected)) {
		pr_debug("%s(), already disconnected!\n", __func__);
		return;
	}

	/*
         *  Remove association between this LSAP and the link it used
         */
	IRDA_ASSERT(self->lap != NULL, return;);
	IRDA_ASSERT(self->lap->lsaps != NULL, return;);

	lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
	self->lap->cache.valid = FALSE;
#endif

	IRDA_ASSERT(lsap != NULL, return;);
	IRDA_ASSERT(lsap == self, return;);
	hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) lsap,
		       (long) lsap, NULL);

	self->dlsap_sel = LSAP_ANY;
	self->lap = NULL;

	/*
         *  Inform service user
         */
	if (self->notify.disconnect_indication) {
		/* Don't forget to refcount it - see irlap_driver_rcv(). */
		if(skb)
			skb_get(skb);
		self->notify.disconnect_indication(self->notify.instance,
						   self, reason, skb);
	} else {
		pr_debug("%s(), no handler\n", __func__);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)15365.38%533.33%


Jean Tourrilhes4418.80%533.33%


Linus Torvalds229.40%16.67%


Dan Carpenter62.56%16.67%


Joe Perches41.71%16.67%


Harvey Harrison41.71%16.67%


Martin Dalecki10.43%16.67%


Total234100.00%15100.00%



/*
 * Function irlmp_do_expiry (void)
 *
 *    Do a cleanup of the discovery log (remove old entries)
 *
 * Note : separate from irlmp_do_discovery() so that we can handle
 * passive discovery properly.
 */



void irlmp_do_expiry(void)
{
	struct lap_cb *lap;

	/*
         * Expire discovery on all links which are *not* connected.
         * On links which are connected, we can't do discovery
         * anymore and can't refresh the log, so we freeze the
         * discovery log to keep info about the device we are
         * connected to.
         * This info is mandatory if we want irlmp_connect_request()
         * to work properly. - Jean II
         */
	lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
	while (lap != NULL) {
		IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);

		if (lap->lap_state == LAP_STANDBY) {
			/* Expire discoveries discovered on this link */
			irlmp_expire_discoveries(irlmp->cachelog, lap->saddr,
						 FALSE);
		}
		lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds7593.75%125.00%


Al Viro33.75%125.00%


Jean Tourrilhes22.50%250.00%


Total80100.00%4100.00%



/*
 * Function irlmp_do_discovery (nslots)
 *
 *    Do some discovery on all links
 *
 * Note : log expiry is done above.
 */



void irlmp_do_discovery(int