Subject: [PATCH 13/13] IB/ehca: Improve latency by unlocking the SQ/RQ after triggering the hardware

From: Joachim Fenkes <[email-masked]>
Date: Mon, 9 Jul 2007 15:33:52 +0200

From: Hoang-Nam Nguyen <[email-masked]>

Signed-off-by: Joachim Fenkes <[email-masked]>
---
 drivers/infiniband/hw/ehca/ehca_reqs.c |    5 ++---
 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 fd3ba22..61da65e 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;
 }
 
-- 
1.5.2