linux-imx

/*

 * Serial Attached SCSI (SAS) Event processing

 *

 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.

 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>

 *

 * This file is licensed under GPLv2.

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

​

#include <linux/export.h>

#include <scsi/scsi_host.h>

#include "sas_internal.h"

​

int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)

{

    /* it's added to the defer_q when draining so return succeed */

    int rc = 1;

​

    if (!test_bit(SAS_HA_REGISTERED, &ha->state))

        return 0;

​

    if (test_bit(SAS_HA_DRAINING, &ha->state)) {

        /* add it to the defer list, if not already pending */

        if (list_empty(&sw->drain_node))

            list_add_tail(&sw->drain_node, &ha->defer_q);

    } else

        rc = queue_work(ha->event_q, &sw->work);

​

    return rc;

}

​

static int sas_queue_event(int event, struct sas_work *work,

                struct sas_ha_struct *ha)

{

    unsigned long flags;

    int rc;

​

    spin_lock_irqsave(&ha->lock, flags);

    rc = sas_queue_work(ha, work);

    spin_unlock_irqrestore(&ha->lock, flags);

​

    return rc;

}

​

​

void __sas_drain_work(struct sas_ha_struct *ha)

{

    struct sas_work *sw, *_sw;