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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@mongodb.com>
Tested-by: Chris J Arges <chris.j.arges@canonical.com>
Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris J Arges 2014-09-23 09:22:25 -05:00 committed by Greg Kroah-Hartman
parent 39d6457473
commit e6f0636b61
1 changed files with 5 additions and 0 deletions
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5
drivers/message/fusion/mptspi.c
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@ -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