From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eli Cohen Subject: [PATCH for-next 07/14] IB/mlx5: Make sure doorbell record is visible before doorbell Date: Tue, 14 Jan 2014 17:45:16 +0200 Message-ID: <1389714323-20130-8-git-send-email-eli@mellanox.com> References: <1389714323-20130-1-git-send-email-eli@mellanox.com> Return-path: In-Reply-To: <1389714323-20130-1-git-send-email-eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org, ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org, Eli Cohen List-Id: linux-rdma@vger.kernel.org Put a wmb() to make sure the doorbell record is visible to the HCA before we hit doorbell. Signed-off-by: Eli Cohen --- drivers/infiniband/hw/mlx5/qp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c index a056c24..87b7fb1 100644 --- a/drivers/infiniband/hw/mlx5/qp.c +++ b/drivers/infiniband/hw/mlx5/qp.c @@ -2251,6 +2251,10 @@ out: qp->db.db[MLX5_SND_DBR] = cpu_to_be32(qp->sq.cur_post); + /* Make sure doorbell record is visible to the HCA before + * we hit doorbell */ + wmb(); + if (bf->need_lock) spin_lock(&bf->lock); -- 1.8.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html