linux-kernel - Re: [PATCH v2] ata: libata-scsi: Fix CDL control

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Message-ID: <790fe2ae-e750-4095-a716-f3dbb02e0570@kernel.org>
Date: Thu, 14 Aug 2025 19:02:17 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Igor Pylypiv <ipylypiv@...gle.com>, Niklas Cassel <cassel@...nel.org>
Cc: linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ata: libata-scsi: Fix CDL control

On 8/14/25 11:22 AM, Igor Pylypiv wrote:
> Delete extra checks for the ATA_DFLAG_CDL_ENABLED flag that prevent
> SET FEATURES command from being issued to a drive when NCQ commands
> are active.
> 
> ata_mselect_control_ata_feature() sets / clears the ATA_DFLAG_CDL_ENABLED
> flag during the translation of MODE SELECT to SET FEATURES. If SET FEATURES
> gets deferred due to outstanding NCQ commands, the original MODE SELECT
> command will be re-queued. When the re-queued MODE SELECT goes through
> the ata_mselect_control_ata_feature() translation again, SET FEATURES
> will not be issued because ATA_DFLAG_CDL_ENABLED has been already set or
> cleared by the initial translation of MODE SELECT.
> 
> The ATA_DFLAG_CDL_ENABLED checks in ata_mselect_control_ata_feature()
> are safe to remove because scsi_cdl_enable() implements a similar logic
> that avoids enabling CDL if it has been enabled already.
> 
> Fixes: 17e897a45675 ("ata: libata-scsi: Improve CDL control")
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>

Applied to for-6.17-fixes. Thanks !
(Note: I added Cc: stable@...r.kernel.org)

-- 
Damien Le Moal
Western Digital Research