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Subject[PATCH v2] mptfusion: enable no_write_same for vmware scsi disks
Date
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>
---
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) {
--
1.9.1


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