All of lore.kernel.org
 help / color / mirror / Atom feed
From: gijoe@poczta.onet.pl
To: linux-kernel@vger.kernel.org
Subject: OOPS - ide-scsi bug - SCSI BUS number increasing
Date: Sat, 6 Dec 2003 18:15:51 +0100	[thread overview]
Message-ID: <20031206171551.GA5917@us-pc3> (raw)

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=unknown-8bit, Size: 1849 bytes --]




There is a bug in ide-scsi module (kernel version 2.6.0-test10 with enabled
preemptible kernel) - this bug causes SCSI BUS number to be increased by one 
everytime ide-scsi module is reloaded  (modprobe -r ide-scsi then 
do modprobe ide-scsi) - it is easy to spot that with cdrecord -scanbus.
This bug doesn't appear to exist in 2.4 kernel series, I've not tested this
with 2.5 series though, this is not cdrtools fault since I tried both versions
(2.00 and 2.00.3) with the same result.When ide-scsi is compiled into the
kernel, obviously the SCSI BUS number doesn't increase since there is no 
possibility to reload it during the same kernel session.

/proc/scsi/scsi says:

Attached devices:
Host: scsi13 Channel: 00 Id: 00 Lun: 00
  Vendor: LITE-ON  Model: LTR-48246S       Rev: SS0D
  Type:   CD-ROM                           ANSI SCSI revision: 02
  
  
And here is the reproduction of bug -

1) Before reloading ide-scsi, output of cdrecord -scanbus:

Linux sg driver version: 3.5.29
Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
Using libscg version 'schily-0.7'
scsibus13:
	13,0,0	1300) 'LITE-ON ' 'LTR-48246S      ' 'SS0D' Removable CD-ROM
	13,1,0	1301) *
	13,2,0	1302) *
	13,3,0	1303) *
	13,4,0	1304) *
	13,5,0	1305) *
	13,6,0	1306) *
	13,7,0	1307) *
	
2) After preloading (modprobe -r ide-scsi && modprobe ide-scsi)

Linux sg driver version: 3.5.29
Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
Using libscg version 'schily-0.7'
scsibus14:
	14,0,0	1400) 'LITE-ON ' 'LTR-48246S      ' 'SS0D' Removable CD-ROM
	14,1,0	1401) *
	14,2,0	1402) *
	14,3,0	1403) *
	14,4,0	1404) *
	14,5,0	1405) *
	14,6,0	1406) *
	14,7,0	1407) *
	
	
Output of uname -r:

2.6.0-test10-athlon

	
I was trying to fix this bug myself in ide-scsi.c code, but I unfortunately I
don't know it's structure...


             reply	other threads:[~2003-12-06 17:15 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-12-06 17:15 gijoe [this message]
2003-12-06 18:07 ` OOPS - ide-scsi bug - SCSI BUS number increasing Michael J. Cohen
2003-12-06 18:32   ` Zwane Mwaikambo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20031206171551.GA5917@us-pc3 \
    --to=gijoe@poczta.onet.pl \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.