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SubjectRE: Wrong SCSI bus scanning
Date
Jan,

The sym53c8xx and ncr53c8xx drivers depend on virtually the same chipsets,
so there is some potential for confusion in detecting adapters that do/dont
belong to each driver. This causes confusion for the corresponding drivers
in NT also.
Check the scan code in each driver.

Andy

-----Original Message-----
From: Jan-Benedict Glaw [mailto:jbglaw@lug-owl.de]
Sent: Monday, September 24, 2001 8:33 PM
To: linux-kernel@vger.kernel.org
Subject: Wrong SCSI bus scanning


Hi!

For me, SCSI bus # 2 gets double-assigned. Physical layout
is currently:

Bus 0: AIC7xxx (U160 onboard)
- ID0: IBM DDYS-T18350N

Bus 1: AIC7xxx (2nd U160 onboard bus)
- unused

Bus 2: sym53c8xx ('875)
- ID1: PLEXTOR CD-R PX-W1210S
- ID2: PLEXTOR CD-ROM PX-40TS
- ID3: PIONEER DVD-ROM DVD-305

Bus 3: ncr53c8xx ('810)
- ID0: HP CD-Writer 6020
- ID1: PLASMON CDR4220

The U160 controller attaches to my boot disk, so it is compiled-in.
Both other drivers are modules.

When I insert modules for busses #2 and #3, *both* of them get
bus #2 assigned:

==> before additional modules:
weiss-ich-doch-nicht:~# cdrecord -scanbus
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
Linux sg driver version: 3.1.20
Using libscg version 'schily-0.5'
scsibus0:
0,0,0 0) 'IBM ' 'DDYS-T18350N ' 'S96H' Disk
0,1,0 1) *
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *

==> after sym53c8xx:
weiss-ich-doch-nicht:~# cdrecord -scanbus
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
Linux sg driver version: 3.1.20
Using libscg version 'schily-0.5'
scsibus0:
0,0,0 0) 'IBM ' 'DDYS-T18350N ' 'S96H' Disk
0,1,0 1) *
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *
scsibus2:
2,0,0 200) *
2,1,0 201) 'PLEXTOR ' 'CD-R PX-W1210S' '1.02' Removable CD-ROM
2,2,0 202) 'PLEXTOR ' 'CD-ROM PX-40TS ' '1.12' Removable CD-ROM
2,3,0 203) 'PIONEER ' 'DVD-ROM DVD-305 ' '1.03' Removable CD-ROM
2,4,0 204) *
2,5,0 205) *
2,6,0 206) *
2,7,0 207) *

==> after additional insertion of ncr53c8xx:
Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
Linux sg driver version: 3.1.20
Using libscg version 'schily-0.5'
scsibus0:
0,0,0 0) 'IBM ' 'DDYS-T18350N ' 'S96H' Disk
0,1,0 1) *
0,2,0 2) *
0,3,0 3) *
0,4,0 4) *
0,5,0 5) *
0,6,0 6) *
0,7,0 7) *
scsibus2:
2,0,0 200) 'HP ' 'CD-Writer 6020 ' '1.07' Removable CD-ROM
2,1,0 201) 'PLEXTOR ' 'CD-R PX-W1210S' '1.02' Removable CD-ROM
2,2,0 202) 'PLEXTOR ' 'CD-ROM PX-40TS ' '1.12' Removable CD-ROM
2,3,0 203) 'PIONEER ' 'DVD-ROM DVD-305 ' '1.03' Removable CD-ROM
2,4,0 204) *
2,5,0 205) *
2,6,0 206) *
2,7,0 207) *

==> Now, /proc/scsi/scsi contains:

weiss-ich-doch-nicht:/proc/scsi# cat scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: IBM Model: DDYS-T18350N Rev: S96H
Type: Direct-Access ANSI SCSI revision: 03
Host: scsi2 Channel: 00 Id: 01 Lun: 00 <---------------------------
Vendor: PLEXTOR Model: CD-R PX-W1210S Rev: 1.02
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 02 Lun: 00
Vendor: PLEXTOR Model: CD-ROM PX-40TS Rev: 1.12
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 03 Lun: 00
Vendor: PIONEER Model: DVD-ROM DVD-305 Rev: 1.03
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: HP Model: CD-Writer 6020 Rev: 1.07
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 01 Lun: 00 <---------------------------
Vendor: PLASMON Model: CDR4220 Rev: 1.20
Type: CD-ROM ANSI SCSI revision: 02


...which is obviously wrong. Any suggestion on where to start
to search the bug?

MfG, JBG

--
Jan-Benedict Glaw . jbglaw@lug-owl.de . +49-172-7608481
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