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.lu...@mongodb.com> Tested-by: Chris J Arges <chris.j.ar...@canonical.com> Signed-off-by: Chris J Arges <chris.j.ar...@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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
