IB/qib: Don't mark VL15 bufs as WC to avoid a rare 7322 chip problem

Don't set write combining via PAT on the VL15 buffers to avoid a rare
problem with unaligned writes from interrupt-flushed store buffers.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/qib/qib_pcie.c b/drivers/infiniband/hw/qib/qib_pcie.c
index c926bf4..7fa6e55 100644
--- a/drivers/infiniband/hw/qib/qib_pcie.c
+++ b/drivers/infiniband/hw/qib/qib_pcie.c
@@ -179,6 +179,8 @@
 		iounmap(dd->piobase);
 	if (dd->userbase)
 		iounmap(dd->userbase);
+	if (dd->piovl15base)
+		iounmap(dd->piovl15base);
 
 	pci_disable_device(dd->pcidev);
 	pci_release_regions(dd->pcidev);