linux-kernel - Re: [PATCH v4 5/5] libata-scsi: Cap ata_device->max_sectors according to shost->max

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Message-ID: <b69c6112-98b7-3890-9d11-bb321a7c877a@opensource.wdc.com>
Date:   Tue, 28 Jun 2022 08:24:08 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     John Garry <john.garry@...wei.com>, joro@...tes.org,
        will@...nel.org, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        hch@....de, m.szyprowski@...sung.com, robin.murphy@....com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ide@...r.kernel.org, iommu@...ts.linux-foundation.org,
        iommu@...ts.linux.dev, linux-scsi@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [PATCH v4 5/5] libata-scsi: Cap ata_device->max_sectors according
 to shost->max_sectors

On 6/28/22 00:25, John Garry wrote:
> ATA devices (struct ata_device) have a max_sectors field which is
> configured internally in libata. This is then used to (re)configure the
> associated sdev request queue max_sectors value from how it is earlier set
> in __scsi_init_queue(). In __scsi_init_queue() the max_sectors value is set
> according to shost limits, which includes host DMA mapping limits.
> 
> Cap the ata_device max_sectors according to shost->max_sectors to respect
> this shost limit.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> Acked-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

Nit: please change the patch title to "ata: libata-scsi: Cap ..."

> ---
>  drivers/ata/libata-scsi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index 86dbb1cdfabd..24a43d540d9f 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -1060,6 +1060,7 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
>  		dev->flags |= ATA_DFLAG_NO_UNLOAD;
>  
>  	/* configure max sectors */
> +	dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors);
>  	blk_queue_max_hw_sectors(q, dev->max_sectors);
>  
>  	if (dev->class == ATA_DEV_ATAPI) {


-- 
Damien Le Moal
Western Digital Research