Commit ada388f7 authored Jan 14, 2014 by Eli Cohen Committed by Roland Dreier Jan 22, 2014

IB/mlx5: Make sure doorbell record is visible before doorbell



Put a wmb() to make sure the doorbell record is visible to the HCA before we
hit doorbell.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

parent 042b9ada

drivers/infiniband/hw/mlx5/qp.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -2251,6 +2251,10 @@ int mlx5_ib_post_send(struct ib_qp ibqp, struct ib_send_wr wr,

		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);