Set the standard inquiry response additional length field.

[iabdalkader]

Describe the PR
The standard inquiry response additional length field needs to be set to the length in bytes of the remaining standard inquiry data (i.e. N - 5), otherwise the kernel driver issues a warning about short inquiry response.

Additional context
On Linux I see the following warning, it seems the driver assumes the response is the minimum 36 bytes:

[53564.998251] usb-storage 4-2:1.2: USB Mass Storage device detected
[53564.998424] scsi host0: usb-storage 4-2:1.2
[53566.008111] scsi host0: scsi scan: INQUIRY result too short (5), using 36

This warning is gone after setting the additional length field.

See section 3.6.2 Standard INQUIRY data in Seagate SCSI reference manual (PDF link).

Tested using sg_inq, without this patch (note the length=5):

> sudo sg_inq --only /dev/sda
standard INQUIRY:
  PQual=0  PDT=0  RMB=1  LU_CONG=0  hot_pluggable=0  version=0x02  [SCSI-2]
  [AERC=0]  [TrmTsk=0]  NormACA=0  HiSUP=0  Resp_data_format=2
  SCCS=0  ACC=0  TPGS=0  3PC=0  Protect=0  [BQue=0]
  EncServ=0  MultiP=0  [MChngr=0]  [ACKREQQ=0]  Addr16=0
  [RelAdr=0]  WBus16=0  Sync=0  [Linked=0]  [TranDis=0]  CmdQue=0
    length=5 (0x5)
  [for SCSI>=2, len>=36 is expected]   Peripheral device type: disk
Inquiry response length=5, no vendor, product or revision data

With this patch (the expected 36 bytes length):

> sudo sg_inq --only /dev/sda
standard INQUIRY:
  PQual=0  PDT=0  RMB=1  LU_CONG=0  hot_pluggable=0  version=0x02  [SCSI-2]
  [AERC=0]  [TrmTsk=0]  NormACA=0  HiSUP=0  Resp_data_format=2
  SCCS=0  ACC=0  TPGS=0  3PC=0  Protect=0  [BQue=0]
  EncServ=0  MultiP=0  [MChngr=0]  [ACKREQQ=0]  Addr16=0
  [RelAdr=0]  WBus16=0  Sync=0  [Linked=0]  [TranDis=0]  CmdQue=0
    length=36 (0x24)   Peripheral device type: disk
 Vendor identification: Micropy
 Product identification: Mass Storage
 Product revision level: 1.0

[hathach]

just tested, work great. additional_length is length until end of response. I guess the spec (N-4) where N = 35, scsi specs is known to be quite confusing. Thanks dpgeorge for reviewing.