linux-kernel - Re: 2.6.20 libata cdrom

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Message-ID: <46373873.6060704@rtr.ca>
Date:	Tue, 01 May 2007 08:54:11 -0400
From:	Mark Lord <liml@....ca>
To:	Tejun Heo <htejun@...il.com>
Cc:	William Thompson <wt@...ctro-mechanical.com>,
	linux-kernel@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	albertcc@...ibm.com
Subject: Re: 2.6.20 libata cdrom

Tejun Heo wrote:
..
>>>> scsi1 : ata_piix
>>>> ata2.00: failed to IDENTIFY (I/O error, err_mask=0x1)
..
> The err_mask is AC_ERR_DEV indicating that the device raised aborted the
> IDENTIFY command.  I wonder what's going on.
> 
> Can you change "#undef ATA_DEBUG" in include/linux/libata.h to "#define
> ATA_DEBUG" and report the resulting dmesg?  There will be a LOT of
> messages so you probably want to increase printk buffer size and detach
> other devices if possible.  It would be best if your root device isn't
> driven by libata so that you can just insert the module and store the
> resulting dmesg.

If the command really was "IDENTIFY", then of course it failed.
This is an ATAPI device, and it wants "PACKET_IDENTIFY".

Maybe libata somehow thinks it's ATA rather than ATAPI?
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