1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c
index 503992d9c5ce..3e9828be5010 100644
--- a/drivers/infiniband/hw/qib/qib_iba7322.c
+++ b/drivers/infiniband/hw/qib/qib_iba7322.c
@@ -6119,9 +6119,25 @@ static int qib_init_7322_variables(struct qib_devdata *dd)
         qib_set_ctxtcnt(dd);
 
         if (qib_wc_pat) {
-                ret = init_chip_wc_pat(dd, NUM_VL15_BUFS * dd->align4k);
+                resource_size_t vl15off;
+                /*
+                 * We do not set WC on the VL15 buffers to avoid
+                 * a rare problem with unaligned writes from
+                 * interrupt-flushed store buffers, so we need
+                 * to map those separately here.  We can't solve
+                 * this for the rarely used mtrr case.
+                 */
+                ret = init_chip_wc_pat(dd, 0);
                 if (ret)
                         goto bail;
+
+                /* vl15 buffers start just after the 4k buffers */
+                vl15off = dd->physaddr + (dd->piobufbase >> 32) +
+                        dd->piobcnt4k * dd->align4k;
+                dd->piovl15base = ioremap_nocache(vl15off,
+                                                  NUM_VL15_BUFS * dd->align4k);
+                if (!dd->piovl15base)
+                        goto bail;
         }
         qib_7322_set_baseaddrs(dd); /* set chip access pointers now */