linux-imx

/*

 *  LAPB release 002

 *

 *  This code REQUIRES 2.1.15 or higher/ NET3.038

 *

 *  This module:

 *      This module 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.

 *

 *  History

 *  LAPB 001    Jonathan Naylor Started Coding

 *  LAPB 002    Jonathan Naylor New timer architecture.

 *  2000-10-29  Henner Eisen    lapb_data_indication() return status.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/types.h>

#include <linux/socket.h>

#include <linux/in.h>

#include <linux/kernel.h>

#include <linux/jiffies.h>

#include <linux/timer.h>

#include <linux/string.h>

#include <linux/sockios.h>

#include <linux/net.h>

#include <linux/inet.h>

#include <linux/if_arp.h>

#include <linux/skbuff.h>

#include <linux/slab.h>

#include <net/sock.h>

#include <linux/uaccess.h>

#include <linux/fcntl.h>

#include <linux/mm.h>

#include <linux/interrupt.h>

#include <linux/stat.h>

#include <linux/init.h>

#include <net/lapb.h>

​

static LIST_HEAD(lapb_list);

static DEFINE_RWLOCK(lapb_list_lock);

​

/*

 *  Free an allocated lapb control block.

 */

static void lapb_free_cb(struct lapb_cb *lapb)

{

    kfree(lapb);

}

​

static __inline__ void lapb_hold(struct lapb_cb *lapb)

{

    refcount_inc(&lapb->refcnt);

}

​

static __inline__ void lapb_put(struct lapb_cb *lapb)

{

    if (refcount_dec_and_test(&lapb->refcnt))

        lapb_free_cb(lapb);

}

​

/*

 *  Socket removal during an interrupt is now safe.

 */

static void __lapb_remove_cb(struct lapb_cb *lapb)

{

    if (lapb->node.next) {

        list_del(&lapb->node);

        lapb_put(lapb);

    }

}

EXPORT_SYMBOL(lapb_register);

​

/*

 *  Add a socket to the bound sockets list.

 */

static void __lapb_insert_cb(struct lapb_cb *lapb)

{

    list_add(&lapb->node, &lapb_list);

    lapb_hold(lapb);

}

​

static struct lapb_cb *__lapb_devtostruct(struct net_device *dev)

{

    struct list_head *entry;

    struct lapb_cb *lapb, *use = NULL;

​

    list_for_each(entry, &lapb_list) {