scsi_probe_and_add_lun — probe a LUN, if a LUN is found add it
| int scsi_probe_and_add_lun ( | struct scsi_target * starget, | 
| u64 lun, | |
| int * bflagsp, | |
| struct scsi_device ** sdevp, | |
| int rescan, | |
| void * hostdata ); | 
stargetpointer to target device structure
lunLUN of target device
bflagspstore bflags here if not NULL
sdevpprobe the LUN corresponding to this scsi_device
rescanif nonzero skip some code only needed on first scan
hostdata
     passed to scsi_alloc_sdev