linux-kernel - Re: [PATCH v1 3/4] ata: libata-scsi: Report valid sense data for ATA PT if present

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Date: Mon, 17 Jun 2024 08:25:54 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Igor Pylypiv <ipylypiv@...gle.com>, Niklas Cassel <cassel@...nel.org>
Cc: Tejun Heo <tj@...nel.org>, Hannes Reinecke <hare@...e.de>,
 linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/4] ata: libata-scsi: Report valid sense data for ATA
 PT if present

On 6/15/24 04:18, Igor Pylypiv wrote:
> Do not generate sense data from ATA status/error registers
> if valid sense data is already present.

This kind of contradicts what you said in patch 2... So I am really confused now.
Though this patch actually looks good to me, modulo the comment below.
But shouldn't this be squashed with patch 2 ?

> 
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
> ---
>  drivers/ata/libata-scsi.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 79e8103ef3a9..4bfe47e7d266 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -858,12 +858,17 @@ static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
>  	unsigned char *desc = sb + 8;
>  	u8 sense_key, asc, ascq;
>  
> -	/*
> -	 * Use ata_to_sense_error() to map status register bits
> -	 * onto sense key, asc & ascq.
> -	 */
> -	if (qc->err_mask ||
> -	    tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
> +	if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
> +		/*
> +		 * Do not generate sense data from ATA status/error
> +		 * registers if valid sense data is already present.
> +		 */

The empty "if" here is really horrible. Please revert the condition and add it
as a "&&" in the below if.

> +	} else if (qc->err_mask ||
> +		   tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
> +		/*
> +		 * Use ata_to_sense_error() to map status register bits
> +		 * onto sense key, asc & ascq.
> +		 */
>  		ata_to_sense_error(qc->ap->print_id, tf->status, tf->error,
>  				   &sense_key, &asc, &ascq);
>  		ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);

-- 
Damien Le Moal
Western Digital Research