[3.13.y.z extended stable] Patch "mptfusion: enable no_write_same for vmware scsi disks" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Oct 21 20:09:21 UTC 2014

This is a note to let you know that I have just added a patch titled

    mptfusion: enable no_write_same for vmware scsi disks

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:


This patch is scheduled to be released in version

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see



>From e1af51661d45f9b2ccc83832ee2f9900a29681d4 Mon Sep 17 00:00:00 2001
From: Chris J Arges <chris.j.arges at canonical.com>
Date: Tue, 23 Sep 2014 09:22:25 -0500
Subject: mptfusion: enable no_write_same for vmware scsi disks

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 at mongodb.com>
Tested-by: Chris J Arges <chris.j.arges at canonical.com>
Signed-off-by: Chris J Arges <chris.j.arges at canonical.com>
Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/message/fusion/mptspi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c
index 5653e50..424f51d 100644
--- a/drivers/message/fusion/mptspi.c
+++ b/drivers/message/fusion/mptspi.c
@@ -1422,6 +1422,11 @@ mptspi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		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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