linux-kernel - Re: [PATCH v2] sd: Consider max_xfer_blocks if opt_xfer

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Date:   Wed, 29 Mar 2017 22:37:34 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Fam Zheng <famz@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, Laurence Oberman <loberman@...hat.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2] sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable

Fam Zheng <famz@...hat.com> writes:

Fam,

> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index fcfeddc..a5c7e67 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -2957,6 +2957,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
>  		rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
>  	} else
>  		rw_max = BLK_DEF_MAX_SECTORS;
> +	rw_max = min_not_zero(rw_max, logical_to_sectors(sdp, dev_max));
>  
>  	/* Combine with controller limits */
>  	q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));

Instead of updating rw_max twice, how about:

} else
	rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
                              BLK_DEF_MAX_SECTORS);

?

-- 
Martin K. Petersen	Oracle Linux Engineering