linux-kernel - Re: [PATCH libata-dev#upstream-fixes] libata: ignore CFA signature while sanity-checking an ATAPI device

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Message-Id: <20060907132707.38e63155.akpm@osdl.org>
Date:	Thu, 7 Sep 2006 13:27:07 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"J.A. Magallon" <jamagallon@....com>
Subject: Re: [PATCH libata-dev#upstream-fixes] libata: ignore CFA signature
 while sanity-checking an ATAPI device

On Thu, 7 Sep 2006 20:32:24 +0900
Tejun Heo <htejun@...il.com> wrote:

> 0x848a in ID word 0 indicates CFA device iff the ID data is obtained
> from IDENTIFY DEVICE.  For ATAPI devices, 0x848a in ID work 0
> indicates valid ATAPI device.  Fix sanity check in ata_dev_read_id()
> such that ATAPI devices reporting 0x848a in ID word 0 is not handled
> as error.
> 
> The problem is identified by J.A. Magallon with HL-DT-ST DVDRAM
> GSA-4120B.
> 
> Signed-off-by: Tejun Helo <htejun@...il.com>
> Cc: J.A. Magallon <jamagallon@....com>
> ---
> Jeff, this is a regression and thus should go into .19.

You mean 2.6.18, yes?

> diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
> index 73dd6c8..427b73a 100644
> --- a/drivers/scsi/libata-core.c
> +++ b/drivers/scsi/libata-core.c
> @@ -1256,10 +1256,15 @@ int ata_dev_read_id(struct ata_device *d
>  	swap_buf_le16(id, ATA_ID_WORDS);
>  
>  	/* sanity check */
> -	if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
> -		rc = -EINVAL;
> -		reason = "device reports illegal type";
> -		goto err_out;
> +	rc = -EINVAL;
> +	reason = "device reports illegal type";
> +
> +	if (class == ATA_DEV_ATA) {
> +		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
> +			goto err_out;
> +	} else {
> +		if (ata_id_is_ata(id))
> +			goto err_out;
>  	}
>  
>  	if (post_reset && class == ATA_DEV_ATA) {
-
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