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>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c
index fd3ba22467e8..61da65e6e5e0 100644
--- 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;
 }