linux-kernel - [PATCH 3.16 028/127] mptfusion: enable no_write

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Message-Id: <20141028033422.147345492@linuxfoundation.org>
Date:	Tue, 28 Oct 2014 11:34:23 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Bruce Lucas <bruce.lucas@...godb.com>,
	Chris J Arges <chris.j.arges@...onical.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>
Subject: [PATCH 3.16 028/127] mptfusion: enable no_write_same for vmware scsi disks

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris J Arges <chris.j.arges@...onical.com>

commit 4089b71cc820a426d601283c92fcd4ffeb5139c2 upstream.

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>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/message/fusion/mptspi.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/message/fusion/mptspi.c
+++ b/drivers/message/fusion/mptspi.c
@@ -1420,6 +1420,11 @@ mptspi_probe(struct pci_dev *pdev, const
 		goto out_mptspi_probe;
         }

+	/* VMWare emulation doesn't properly implement WRITE_SAME
+	 */
+	if (pdev->subsystem_vendor == 0x15AD)
+		sh->no_write_same = 1;
+
 	spin_lock_irqsave(&ioc->FreeQlock, flags);

 	/* Attach the SCSI Host to the IOC structure

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