Re: [PATCH 5.15.y] scsi: mpi3mr: Fix ATA NCQ priority support

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Jun 18, 2024 at 12:03:45PM +0900, Damien Le Moal wrote:
> Commit 90e6f08915ec6efe46570420412a65050ec826b2 upstream.
> 
> The function mpi3mr_qcmd() of the mpi3mr driver is able to indicate to
> the HBA if a read or write command directed at an ATA device should be
> translated to an NCQ read/write command with the high prioiryt bit set
> when the request uses the RT priority class and the user has enabled NCQ
> priority through sysfs.
> 
> However, unlike the mpt3sas driver, the mpi3mr driver does not define
> the sas_ncq_prio_supported and sas_ncq_prio_enable sysfs attributes, so
> the ncq_prio_enable field of struct mpi3mr_sdev_priv_data is never
> actually set and NCQ Priority cannot ever be used.
> 
> Fix this by defining these missing atributes to allow a user to check if
> an ATA device supports NCQ priority and to enable/disable the use of NCQ
> priority. To do this, lift the function scsih_ncq_prio_supp() out of the
> mpt3sas driver and make it the generic SCSI SAS transport function
> sas_ata_ncq_prio_supported(). Nothing in that function is hardware
> specific, so this function can be used in both the mpt3sas driver and
> the mpi3mr driver.
> 
> Reported-by: Scott McCoy <scott.mccoy@wdc.com>
> Fixes: 023ab2a9b4ed ("scsi: mpi3mr: Add support for queue command processing")
> Cc: stable@vger.kernel.org
> Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
> Link: https://lore.kernel.org/r/20240611083435.92961-1-dlemoal@kernel.org
> Reviewed-by: Niklas Cassel <cassel@kernel.org>
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> (cherry picked from commit 90e6f08915ec6efe46570420412a65050ec826b2)

Now queued up, thanks.

greg k-h