IB/ehca: Improve latency by unlocking after triggering the hardware

Kick the hardware before unlocking the send/receive queue to overlap
processing a little more.

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c
index fd3ba22467e85bf9144cbf3bd8b980210d1a4344..61da65e6e5e09957868d2097808d77ad809b5baf 100644 (file)
--- a/drivers/infiniband/hw/ehca/ehca_reqs.c
+++ b/drivers/infiniband/hw/ehca/ehca_reqs.c
@@ -407,10 +407,9 @@ int ehca_post_send(struct ib_qp *qp,
        } /* eof for cur_send_wr */
 
 post_send_exit0:
-       /* UNLOCK the QUEUE */
-       spin_unlock_irqrestore(&my_qp->spinlock_s, flags);
        iosync(); /* serialize GAL register access */
        hipz_update_sqa(my_qp, wqe_cnt);
+       spin_unlock_irqrestore(&my_qp->spinlock_s, flags);
        return ret;
 }
 
@@ -473,9 +472,9 @@ static int internal_post_recv(struct ehca_qp *my_qp,
        } /* eof for cur_recv_wr */
 
 post_recv_exit0:
-       spin_unlock_irqrestore(&my_qp->spinlock_r, flags);
        iosync(); /* serialize GAL register access */
        hipz_update_rqa(my_qp, wqe_cnt);
+       spin_unlock_irqrestore(&my_qp->spinlock_r, flags);
        return ret;
 }