linux-kernel - Re: [PATCH v2 1/6] ata: libata-scsi: Do not overwrite valid sense data when CK

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Date: Wed, 26 Jun 2024 15:27:11 +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>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 Jason Yan <yanaijie@...wei.com>, linux-ide@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/6] ata: libata-scsi: Do not overwrite valid sense
 data when CK_COND=1

On 6/25/24 07:12, Igor Pylypiv wrote:
> Current ata_gen_passthru_sense() code performs two actions:
> 1. Generates sense data based on the ATA 'status' and ATA 'error' fields.
> 2. Populates "ATA Status Return sense data descriptor" / "Fixed format
>    sense data" with ATA taskfile fields.
> 
> The problem is that #1 generates sense data even when a valid sense data
> is already present (ATA_QCFLAG_SENSE_VALID is set). Factoring out #2 into
> a separate function allows us to generate sense data only when there is
> no valid sense data (ATA_QCFLAG_SENSE_VALID is not set).
> 
> As a bonus, we can now delete a FIXME comment in atapi_qc_complete()
> which states that we don't want to translate taskfile registers into
> sense descriptors for ATAPI.
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>

Reviewed-by: Damien Le Moal <dlemoal@...nel.org>

-- 
Damien Le Moal
Western Digital Research