linux-kernel - Re: [PATCH] scsi disk: Use its own buffer for the vpd request

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Date:	Thu, 01 Aug 2013 16:37:47 +0200
From:	Bernd Schubert <bernd.schubert@...tmail.fm>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	Nix <nix@...eri.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org, nick.cheng@...ca.com.tw,
	stable@...r.kernel.org, Douglas Gilbert <dgilbert@...erlog.com>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH] scsi disk: Use its own buffer for the vpd request

Whoops, the title is wrong, it should have been:

[PATCH] scsi disk: Limit get_vpd_page buf size

On 08/01/2013 04:34 PM, Bernd Schubert wrote:
> Once I noticed that scsi_get_vpd_page() works fine from other function
> calls and that it is not 0x89, but already 0x0 that fails fixing it became
> easy.
>
> Nix, any chance you could verify it also works for you?
>
>
> From: Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
>
> Somehow older areca firmware versions have issues with
> scsi_get_vpd_page() and a large buffer.
> Even scsi_get_vpd_page(, page=0,)  failed in sd_read_write_same(),
> while a similar request from sd_read_block_limits() worked fine.
> Limiting the buf-size to 64-bytes fixes the issue with F/W V1.46.
>
> Fixes a regression with areca controllers and older firmware versions
> introduced by commit: 66c28f97120e8a621afd5aa7a31c4b85c547d33d
>
> Reported-by: Nix <nix@...eri.org.uk>
> Signed-off-by: Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
> CC: stable@...r.kernel.org
> ---
>   drivers/scsi/sd.c |    5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 80f39b8..02e50ae 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -2651,13 +2651,16 @@ static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
>   	struct scsi_device *sdev = sdkp->device;
>
>   	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
> +		/* too large values might cause issues with arcmsr */
> +		int vpd_buf_len = 64;
> +
>   		sdev->no_report_opcodes = 1;
>
>   		/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
>   		 * CODES is unsupported and the device has an ATA
>   		 * Information VPD page (SAT).
>   		 */
> -		if (!scsi_get_vpd_page(sdev, 0x89, buffer, SD_BUF_SIZE))
> +		if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
>   			sdev->no_write_same = 1;
>   	}
>
>

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