linux-kernel - Re: 2.6.20 libata cdrom

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Date:	Tue, 01 May 2007 09:04:46 -0400
From:	Mark Lord <liml@....ca>
To:	William Thompson <wt@...ctro-mechanical.com>
Cc:	Tejun Heo <htejun@...il.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

William Thompson wrote:
>
> +scsi2 : ata_piix
> +ata_port_schedule_eh: port EH scheduled
> +ata_scsi_error: ENTER
> +ata_port_flush_task: ENTER
> +ata_port_flush_task: flush #1
> +ata2: ata_port_flush_task: flush #2
> +ata2: ata_port_flush_task: EXIT
> +ata_eh_autopsy: ENTER
> +ata_eh_recover: ENTER
> +ata_eh_prep_resume: ENTER
> +ata_eh_prep_resume: EXIT
> +__ata_port_freeze: ata2 port frozen
> +ata_std_softreset: ENTER
> +ata_std_softreset: about to softreset, devmask=1
> +ata_bus_softreset: ata2: bus reset via SRST
> +ata_dev_classify: found ATA device by sig
> +ata_dev_classify: unknown device
> +ata_std_softreset: EXIT, classes[0]=1 [1]=5
> +ata_std_postreset: ENTER
> +ata_std_postreset: EXIT
> +ata_eh_thaw_port: ata2 port thawed
> +ata_eh_revalidate_and_attach: ENTER
> +ata2.00: ata_dev_read_id: ENTER, host 2, dev 0
> +ata_exec_command_pio: ata2: cmd 0xEC
> +ata_hsm_move: ata2: protocol 2 task_state 1 (dev_stat 0x51)
> +ata_hsm_move: ata2: protocol 2 task_state 3 (dev_stat 0x51)
> +ata_port_flush_task: ENTER
> +ata_port_flush_task: flush #1
> +ata2: ata_port_flush_task: flush #2
> +ata2: ata_port_flush_task: EXIT
> +ata2.00: failed to IDENTIFY (I/O error, err_mask=0x1)
> +ata_eh_revalidate_and_attach: EXIT
..

Yep.  Libata seems to be treating the ATAPI drive as ATA.

Tejun, don't we have a fallback for when IDENTIFY fails?
If the drive rejects it (err=0x04), then this can mean only one thing:
unsupported command, so we next must try PACKET_IDENTIFY.

-ml
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