linux-kernel - Re: [PATCH] Use the correct size to set block max sectors

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Message-ID: <aad00979-740e-b844-64fb-4bfa646796e5@sandisk.com>
Date:	Thu, 26 May 2016 19:18:35 -0700
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Long Li <longli@...rosoft.com>,
	"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	KY Srinivasan <kys@...rosoft.com>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Use the correct size to set block max sectors

On 05/26/16 17:08, Long Li wrote:
> The block sector size should be in unit of 512 bytes, not in bytes.
>
> Signed-off-by: Long Li <longli@...rosoft.com>
>
> ---
>  drivers/scsi/sd.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 428c03e..4bce17e 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -2862,9 +2862,11 @@ static int sd_revalidate_disk(struct gendisk *disk)
>  	if (sdkp->opt_xfer_blocks &&
>  	    sdkp->opt_xfer_blocks <= dev_max &&
>  	    sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
> -	    sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_SIZE)
> -		rw_max = q->limits.io_opt =
> +	    sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_SIZE) {
> +		q->limits.io_opt =
>  			sdkp->opt_xfer_blocks * sdp->sector_size;
> +		rw_max = (q->limits.io_opt >> 9);
> +	}
>  	else
>  		rw_max = BLK_DEF_MAX_SECTORS;

Isn't this a duplicate of a patch Martin Petersen posted three weeks 
ago? See also http://thread.gmane.org/gmane.linux.scsi/113746.

Bart.