tran_reset_notify() Entry Point

Use the tran_reset_notify(9E) entry point when a SCSI bus reset occurs. This function requests the SCSI HBA driver to notify the target driver by callback.

Example 18–12 HBA Driver tran_reset_notify(9E) Entry Point

isp_scsi_reset_notify(
    struct scsi_address    *ap,
    int                    flag,
    void                   (*callback)(caddr_t),
    caddr_t                arg)
{
    struct isp                       *isp;
    struct isp_reset_notify_entry    *p, *beforep;
    int                              rval = DDI_FAILURE;

    isp = (struct isp *)ap->a_hba_tran->tran_hba_private;
    mutex_enter(ISP_REQ_MUTEX(isp));
    /*
     * Try to find an existing entry for this target
     */
    p = isp->isp_reset_notify_listf;
    beforep = NULL;

    while (p) {
        if (p->ap == ap)
            break;
        beforep = p;
        p = p->next;
    }

    if ((flag & SCSI_RESET_CANCEL) && (p != NULL)) {
        if (beforep == NULL) {
            isp->isp_reset_notify_listf = p->next;
        } else {
            beforep->next = p->next;
        }
        kmem_free((caddr_t)p, sizeof (struct isp_reset_notify_entry));
        rval = DDI_SUCCESS;
    } else if ((flag & SCSI_RESET_NOTIFY) && (p == NULL)) {
        p = kmem_zalloc(sizeof (struct isp_reset_notify_entry),
          KM_SLEEP);
        p->ap = ap;
        p->callback = callback;
        p->arg = arg;
        p->next = isp->isp_reset_notify_listf;
        isp->isp_reset_notify_listf = p;
        rval = DDI_SUCCESS;
    }
    mutex_exit(ISP_REQ_MUTEX(isp));
    return (rval);
}