tran_reset_notify() Entry Point

The tran_reset_notify(9E) entry point for a SCSI HBA driver is called to request that the HBA driver notify the target driver by callback when a SCSI bus reset occurs.

Example 15–12 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);
}