linux-kernel - Re: [PATCH v2] mptfusion: enable no_write

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Date:	Mon, 22 Sep 2014 15:54:51 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	hch@...radead.org
CC:	bruce.lucas@...godb.com,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, adam.radford@...gotech.com,
	kashyap.desai@...gotech.com
Subject: Re: [PATCH v2] mptfusion: enable no_write_same for vmware scsi disks

On 09/22/2014 03:44 PM, Chris J Arges wrote:
> When using a virtual SCSI disk in a VMWare VM if blkdev_issue_zeroout is used
> data can be improperly zeroed out using the mptfusion driver. This patch
> disables write_same for this driver and the vmware subsystem_vendor which
> ensures that manual zeroing out is used instead.
> 
> BugLink: http://bugs.launchpad.net/bugs/1371591
> Reported-by: Bruce Lucas <bruce.lucas@...godb.com>
> Tested-by: Chris J Arges <chris.j.arges@...onical.com>
> Signed-off-by: Chris J Arges <chris.j.arges@...onical.com>
> ---
>  drivers/message/fusion/mptspi.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c
> index 787933d..fca1594 100644
> --- a/drivers/message/fusion/mptspi.c
> +++ b/drivers/message/fusion/mptspi.c
> @@ -1409,6 +1409,12 @@ mptspi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		return 0;
>  	}
>  
> +	/* Fix for vmware guests that do not implement write_same
> +         */
> +	if (pdev->subsystem_vendor == 0x15AD) {
> +		mptspi_driver_template.no_write_same = 1;
> +	}
> +
>  	sh = scsi_host_alloc(&mptspi_driver_template, sizeof(MPT_SCSI_HOST));
>  
>  	if (!sh) {
> 

This is a do-no-harm patch, with a case to check for vmware
subsystem_vendor as suggested by Christoph. Let me know if there are
issues with this patch (do I need a define for the vendor ID? Is the
comment a little too vague or unnecessary?)

Adding those that were CC'ed in the other part of the thread.

Thanks,
--chris j arges
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