[sane-devel] sanei_scsi.c: SCSI command complained: Success

[Henning Meier-Geinitz]

Hi,

during the last year I had some bug reports that included the
following or a similar debug log:

[...]
[sanei_scsi] sanei_scsi_req_wait: SCSI command complained: Success
[sanei_scsi] sense buffer: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[sanei_scsi] target status: 00 host status: 0003 driver status: 0000
[...]

Where can I read about the meaning of the status numbers?

The output was usually caused by a backend bug (mustek) but I didn't
understand the "Success". The corresponding code is the following:

             /* check for errors, but let the sense_handler decide.... */
             if (   ((req->sgdata.sg3.hdr.info & SG_INFO_CHECK) != 0)
                 || (req->sgdata.sg3.hdr.sb_len_wr > 0 &&
                 ((req->sgdata.sg3.sense_buffer[0] & 0x7f) != 0)))

/* what do the first two tests mean? */
               {
                 SANEI_SCSI_Sense_Handler handler
                   = fd_info[req->fd].sense_handler;
                 void *arg = fd_info[req->fd].sense_handler_arg;

                 DBG (1, "sanei_scsi_req_wait: SCSI command complained: %s\n",
                      strerror(errno));
		      
/* Is errno really the result of the SG access or maybe just the
   result of a DBG write? */
 
                 DBG(10, "sense buffer: %02x %02x %02x %02x %02x %02x %02x %02x"
                         " %02x %02x %02x %02x %02x %02x %02x %02x\n",
                         req->sgdata.sg3.sense_buffer[0],
                         req->sgdata.sg3.sense_buffer[1],
                         req->sgdata.sg3.sense_buffer[2],
                         req->sgdata.sg3.sense_buffer[3],
                         req->sgdata.sg3.sense_buffer[4],
                         req->sgdata.sg3.sense_buffer[5],
                         req->sgdata.sg3.sense_buffer[6],
                         req->sgdata.sg3.sense_buffer[7],
                         req->sgdata.sg3.sense_buffer[8],
                         req->sgdata.sg3.sense_buffer[9],
                         req->sgdata.sg3.sense_buffer[10],
                         req->sgdata.sg3.sense_buffer[11],
                         req->sgdata.sg3.sense_buffer[12],
                         req->sgdata.sg3.sense_buffer[13],
                         req->sgdata.sg3.sense_buffer[14],
                         req->sgdata.sg3.sense_buffer[15]);
                 DBG(10, "target status: %02x host status: %04x"
                         " driver status: %04x\n",
                         req->sgdata.sg3.hdr.status,
                         req->sgdata.sg3.hdr.host_status,
                         req->sgdata.sg3.hdr.driver_status);

Or finally: Is the above mentioned output correct and intended?

Bye,
  Henning