scsi_device_lookup — find a device given the host
struct scsi_device * scsi_device_lookup
(struct Scsi_Host * shost, uint channel, uint id, uint lun);
SCSI host pointer
SCSI channel (zero if only one channel)
SCSI target number (physical unit number)
SCSI Logical Unit Number
Looks up the scsi_device with the specified channel, id, lun for a given host. The returned scsi_device has an additional reference that needs to be released with scsi_device_put once you're done with it.