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

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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>
This commit is contained in:
Eli Cohen 2014-01-14 17:45:16 +02:00 committed by Roland Dreier
parent 042b9adae8
commit ada388f7af
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/mlx5/qp.c
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@ -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);