int i2o_scsi_queuecommand (Scsi_Cmnd * SCpnt, void (*done) Scsi_Cmnd *);
Issue a scsi comamnd asynchronously. Return 0 on success or 1 if we hit an error (normally message queue congestion). The only minor complication here is that I2O deals with the device addressing so we have to map the bus/dev/lun back to an I2O handle as well as faking absent devices ourself.
takes the controller lock on error path only