linux-kernel - Re: [PATCH v1] scsi: libsas: set data_dir as DMA

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Date:   Wed,  2 Sep 2020 23:01:01 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     jejb@...ux.ibm.com, Luo Jiaxing <luojiaxing@...wei.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        linuxarm@...wei.com, linux-scsi@...r.kernel.org,
        yanaijie@...wei.com, chenxiang66@...ilicon.com,
        john.garry@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] scsi: libsas: set data_dir as DMA_NONE if libata mark qc as NODATA

On Wed, 26 Aug 2020 15:24:26 +0800, Luo Jiaxing wrote:

> We found that it will fail every time when set feature to SATA disk by
> "sdparm -s WCE=0 /dev/sde".
> 
> After checking protocol, we know that MODE SELECT is the SCSI command for
> setting WCE, and it do not exist in the SATA protocol. Therefore, this
> commands are encapsulated in the SET FEATURE command in SATA protocol.
> The difference is that the MODE SELECT command sent to SAS disk contains
> data and is sent through the DMA. But when send to SATA disk through
> SET FEATURE command, it does not contain data.
> 
> [...]

Applied to 5.9/scsi-fixes, thanks!

[1/1] scsi: libsas: Set data_dir as DMA_NONE if libata marks qc as NODATA
      https://git.kernel.org/mkp/scsi/c/53de092f47ff

-- 
Martin K. Petersen	Oracle Linux Engineering