linux-imx

/*

 *  scsi_error.c Copyright (C) 1997 Eric Youngdale

 *

 *  SCSI error/timeout handling

 *      Initial versions: Eric Youngdale.  Based upon conversations with

 *                        Leonard Zubkoff and David Miller at Linux Expo,

 *                        ideas originating from all over the place.

 *

 *  Restructured scsi_unjam_host and associated functions.

 *  September 04, 2002 Mike Anderson (andmike@us.ibm.com)

 *

 *  Forward port of Russell King's (rmk@arm.linux.org.uk) changes and

 *  minor cleanups.

 *  September 30, 2002 Mike Anderson (andmike@us.ibm.com)

 */

​

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/gfp.h>

#include <linux/timer.h>

#include <linux/string.h>

#include <linux/kernel.h>

#include <linux/freezer.h>

#include <linux/kthread.h>

#include <linux/interrupt.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <linux/jiffies.h>

​

#include <scsi/scsi.h>

#include <scsi/scsi_cmnd.h>

#include <scsi/scsi_dbg.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_driver.h>

#include <scsi/scsi_eh.h>

#include <scsi/scsi_common.h>

#include <scsi/scsi_transport.h>

#include <scsi/scsi_host.h>

#include <scsi/scsi_ioctl.h>

#include <scsi/scsi_dh.h>

#include <scsi/scsi_devinfo.h>

#include <scsi/sg.h>

​

#include "scsi_priv.h"

#include "scsi_logging.h"

#include "scsi_transport_api.h"

​

#include <trace/events/scsi.h>

​

#include <asm/unaligned.h>

​

static void scsi_eh_done(struct scsi_cmnd *scmd);

​

/*

 * These should *probably* be handled by the host itself.

 * Since it is allowed to sleep, it probably should.

 */

#define BUS_RESET_SETTLE_TIME   (10)

#define HOST_RESET_SETTLE_TIME  (10)

​

static int scsi_eh_try_stu(struct scsi_cmnd *scmd);

static int scsi_try_to_abort_cmd(struct scsi_host_template *,

                 struct scsi_cmnd *);

​

void scsi_eh_wakeup(struct Scsi_Host *shost)

{

    lockdep_assert_held(shost->host_lock);

​

    if (scsi_host_busy(shost) == shost->host_failed) {

        trace_scsi_eh_wakeup(shost);

        wake_up_process(shost->ehandler);

        SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost,

            "Waking error handler thread\n"));

    }

}

​

/**

 * scsi_schedule_eh - schedule EH for SCSI host

 * @shost:  SCSI host to invoke error handling on.

 *

 * Schedule SCSI EH without scmd.

 */

void scsi_schedule_eh(struct Scsi_Host *shost)

{

    unsigned long flags;

​

    spin_lock_irqsave(shost->host_lock, flags);

​

    if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||

        scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {

        shost->host_eh_scheduled++;

        scsi_eh_wakeup(shost);