struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, uint id, uint lun, void *hostdata)
int scsi_add_device(struct Scsi_Host *host, uint channel, uint target, uint lun)
struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,				      uint id, uint lun, void *hostdata){	struct scsi_device *sdev;	struct device *parent = &shost->shost_gendev;	int res;	struct scsi_target *starget = scsi_alloc_target(parent, channel, id);	if (!starget)		return ERR_PTR(-ENOMEM);	get_device(&starget->dev);	down(&shost->scan_mutex);	if (scsi_host_scan_allowed(shost)) {		res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,					     hostdata);		if (res != SCSI_SCAN_LUN_PRESENT)			sdev = ERR_PTR(-ENODEV);	}	up(&shost->scan_mutex);	scsi_target_reap(starget);	put_device(&starget->dev);	return sdev;}