scsi_module.c

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/*
 * Copyright (C) 2003 Christoph Hellwig.
 *  Released under GPL v2.
 *
 * Support for old-style host templates.
 *
 * NOTE:  Do not use this for new drivers ever.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include <scsi/scsi_host.h>


static int __init init_this_scsi_driver(void)
{
    struct scsi_host_template *sht = &driver_template;
    struct Scsi_Host *shost;
    struct list_head *l;
    int error;

    if (!sht->release) {
        printk(KERN_ERR
            "scsi HBA driver %s didn't set a release method.\n",
            sht->name);
        return -EINVAL;
    }

    sht->module = THIS_MODULE;
    INIT_LIST_HEAD(&sht->legacy_hosts);

    sht->detect(sht);
    if (list_empty(&sht->legacy_hosts))
        return -ENODEV;

    list_for_each_entry(shost, &sht->legacy_hosts, sht_legacy_list) {
        error = scsi_add_host(shost, NULL);
        if (error)
            goto fail;
        scsi_scan_host(shost);
    }
    return 0;
 fail:
    l = &shost->sht_legacy_list;
    while ((l = l->prev) != &sht->legacy_hosts)
        scsi_remove_host(list_entry(l, struct Scsi_Host, sht_legacy_list));
    return error;
}

static void __exit exit_this_scsi_driver(void)
{
    struct scsi_host_template *sht = &driver_template;
    struct Scsi_Host *shost, *s;

    list_for_each_entry(shost, &sht->legacy_hosts, sht_legacy_list)
        scsi_remove_host(shost);
    list_for_each_entry_safe(shost, s, &sht->legacy_hosts, sht_legacy_list)
        sht->release(shost);

    if (list_empty(&sht->legacy_hosts))
        return;

    printk(KERN_WARNING "%s did not call scsi_unregister\n", sht->name);
    dump_stack();

    list_for_each_entry_safe(shost, s, &sht->legacy_hosts, sht_legacy_list)
        scsi_unregister(shost);
}

module_init(init_this_scsi_driver);
module_exit(exit_this_scsi_driver);