detach() Entry Point (SCSI Target Drivers)

The detach(9E) entry point is the inverse of attach(9E); it must free all resources that were allocated in attach(). If successful, the detach should call scsi_unprobe(9F). Example 14–3 shows a target driver detach() routine.

Example 14–3 SCSI Target Driver detach(9E) Routine

static int
xxdetach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    struct xxstate *xsp;
    switch (cmd) {
    case DDI_DETACH:
          normal detach(9E) operations, such as getting a
          pointer to the state structure
          ...
          scsi_free_consistent_buf(xsp->rqsbuf);
          scsi_destroy_pkt(xsp->rqs);
          xsp->sdp->sd_private = (caddr_t)NULL;
          xsp->sdp->sd_sense = NULL;
          scsi_unprobe(xsp->sdp);
          remove minor nodes
          free resources, such as the state structure and properties
              return (DDI_SUCCESS);
    case DDI_SUSPEND:
          For information, see Chapter 9
    default:
          return (DDI_FAILURE);
    }
}