IB/mthca: reset QP's last pointers when transitioning to reset state

last pointer is not updated when QP is modified to reset state.  This
causes data corruption if WQEs are already posted on the queue.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index dd4e13303e96e8f470e50c37e6d2a35377f1a373..f9c8eb9845c908660429cb03c296f417ad89c94d 100644 (file)
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -871,7 +871,10 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask)
                                       qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
 
                mthca_wq_init(&qp->sq);
+               qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
+
                mthca_wq_init(&qp->rq);
+               qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
 
                if (mthca_is_memfree(dev)) {
                        *qp->sq.db = 0;