1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_ud.c b/drivers/infiniband/hw/ipath/ipath_ud.c
index 38ba771b3efe..f9a3338a5fb7 100644
--- a/drivers/infiniband/hw/ipath/ipath_ud.c
+++ b/drivers/infiniband/hw/ipath/ipath_ud.c
@@ -176,6 +176,8 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
                         dev->n_pkt_drops++;
                         goto bail_sge;
                 }
+                /* Make sure entry is read after head index is read. */
+                smp_rmb();
                 wqe = get_rwqe_ptr(rq, tail);
                 if (++tail >= rq->size)
                         tail = 0;