detach() 入口点（SCSI 目标驱动程序）

detach(9E) 入口点与 attach(9E) 是反向的入口点。detach() 必须释放在 attach() 中分配的所有资源。如果成功，则 detach 应调用 scsi_unprobe(9F)。以下示例显示了目标驱动程序的 detach() 例程。

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 the "Directory Memory Access (DMA)" */
          /* chapter in this book. */
      default:
          return (DDI_FAILURE);
    }
}