linux-kernel - Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support properly

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Message-ID: <494A837A.50801@garzik.org>
Date:	Thu, 18 Dec 2008 12:08:10 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Mario Schwalbe <schwalbe@....tu-dresden.de>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support
 properly

Mario Schwalbe wrote:
> This patch fixes ata_id_has_dword_io to return 1 (supported) if
> the drive is compliant to ATA2 or newer and evaluates the config
> word for older drives.
> 
> Signed-off-by: Mario Schwalbe <schwalbe@....tu-dresden.de>
> ---
>  include/linux/ata.h |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/ata.h b/include/linux/ata.h
> index a53318b..d0d6a9c 100644
> --- a/include/linux/ata.h
> +++ b/include/linux/ata.h
> @@ -700,12 +700,12 @@ static inline int ata_id_has_tpm(const u16 *id)
> 
>  static inline int ata_id_has_dword_io(const u16 *id)
>  {
> -	/* ATA 8 reuses this flag for "trusted" computing */
> -	if (ata_id_major_version(id) > 7)
> -		return 0;
> -	if (id[ATA_ID_DWORD_IO] & (1 << 0))
> -		return 1;
> -	return 0;
> +	/* This flag is defined up to ATA1 and deprecated since then
> +	   (ATA 8 reuses this flag for "trusted" computing). */
> +	if (ata_id_major_version(id) <= 1)
> +		return (id[ATA_ID_DWORD_IO] & (1 << 0)) != 0;
> +	/* later revision drives support DWORD I/O just fine */
> +	return 1;


This seems like a risky assumption...

	Jeff


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