linux-kernel - Re: 2.6.20 libata cdrom

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Date:	Tue, 01 May 2007 08:55:25 -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

Mark Lord wrote:
> 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?

And this is the second one today where it would be very useful
to see a tf dump.  It's time to add one to that code patch, methinks.
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