Kernel 2.6.9 undecoded slave problem, fixed in 2.6.10-rc2-bk8!

Kernel 2.6.9 undecoded slave problem, fixed in 2.6.10-rc2-bk8!

[Justin Piszcz]

I have fixed this issue but I just wanted to let others that have this 
issue know that 2.6.10-rc2-bk8 has fixed the issue.

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Problem: Only one of my CDROM's is recognized when both drives are 
attached to the 1 IDE bus of a PROMISE 20269 controller.  When I have them 
attached to the motherboard (Intel 440BX), I do not have this problem.

>From dmesg:

hde: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive
hdf: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive
ide-probe: ignoring undecoded slave

In: http://www.uwsg.iu.edu/hypermail/linux/kernel/0410.3/1288.html

There is a message that states:

<bzolnier@trik.(none)> (04/10/26 1.2191)
[ide] ide-probe: undecoded slave fixup

Undecoded slave fixup is a oneliner patch to ide-probe to
recognize both of my Maxtor drives that appear to have the same
serial number, D3000000.

Another thread:
http://www.ussg.iu.edu/hypermail/linux/kernel/0409.2/1665.html

The interesting part of all of this is that this only occurs when I have 
the two cdroms on a promise controller, on the same IDE channel, normally 
I have them both on the motherboard as master and slave.  I wanted to make 
sure the card worked however, so switched the connection over to the 
promise board and then I am getting the same error as the guy above, 
except in my case it is with two identical CDROMS and not hard drives.

The problem occurs with 2.6.9.

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Update: With 2.6.10-rc2-bk8, it has fixed the problem!

hde: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive
hdf: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive
ide2 at 0xd8f8-0xd8ff,0xd8f2 on irq 11
hde: ATAPI 40X CD-ROM drive, 128kB Cache
Uniform CD-ROM driver Revision: 3.20
hdf: ATAPI 40X CD-ROM drive, 128kB Cache
Probing IDE interface ide3...

root@p500b:~# mount /dev/hde /mnt/cd1
mount: block device /dev/hde is write-protected, mounting read-only
root@p500b:~# mount /dev/hdf /mnt/cd2
mount: block device /dev/hdf is write-protected, mounting read-only
root@p500b:~#

Re: Kernel 2.6.9 undecoded slave problem, fixed in 2.6.10-rc2-bk8!

[Eric Mudama]

Um... if it happens on one controller and not another, the bug
shouldn't be in the drives themselves.  Every Maxtor drive ever made
has a unique serial number, and the ones people are seeing are
completely invalid.

This issue should be root caused, something is getting stomped on, and
it may affect more than just the ID of the drive.  I fear that these
are bandaids covering some underlying issue.

--eric


On Thu, 2 Dec 2004 09:27:20 -0500 (EST), Justin Piszcz
<jpiszcz@lucidpixels.com> wrote:
> The interesting part of all of this is that this only occurs when I have
> the two cdroms on a promise controller, on the same IDE channel, normally
> I have them both on the motherboard as master and slave.  I wanted to make
> sure the card worked however, so switched the connection over to the
> promise board and then I am getting the same error as the guy above,
> except in my case it is with two identical CDROMS and not hard drives.
> 
> The problem occurs with 2.6.9.
> 
> -------------------------------------------------------------------------
> 
> Update: With 2.6.10-rc2-bk8, it has fixed the problem!
> 
> hde: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive
> hdf: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive
> ide2 at 0xd8f8-0xd8ff,0xd8f2 on irq 11
> hde: ATAPI 40X CD-ROM drive, 128kB Cache
> Uniform CD-ROM driver Revision: 3.20
> hdf: ATAPI 40X CD-ROM drive, 128kB Cache
> Probing IDE interface ide3...
> 
> root@p500b:~# mount /dev/hde /mnt/cd1
> mount: block device /dev/hde is write-protected, mounting read-only
> root@p500b:~# mount /dev/hdf /mnt/cd2
> mount: block device /dev/hdf is write-protected, mounting read-only
> root@p500b:~#