1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_rc.c b/drivers/infiniband/hw/ipath/ipath_rc.c
index 5c29b2bfea17..120a61b03bc4 100644
--- a/drivers/infiniband/hw/ipath/ipath_rc.c
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c
@@ -959,8 +959,9 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode,
                 /* If this is a partial ACK, reset the retransmit timer. */
                 if (qp->s_last != qp->s_tail) {
                         spin_lock(&dev->pending_lock);
-                        list_add_tail(&qp->timerwait,
-                                      &dev->pending[dev->pending_index]);
+                        if (list_empty(&qp->timerwait))
+                                list_add_tail(&qp->timerwait,
+                                        &dev->pending[dev->pending_index]);
                         spin_unlock(&dev->pending_lock);
                         /*
                          * If we get a partial ACK for a resent operation,