linux-kernel - Re: [PATCH for-next 20/20] IB/hns: Delete the redundant lines in hns_roce_v1_m

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Message-ID: <20160915101529.GY26069@leon.nu>
Date:   Thu, 15 Sep 2016 13:15:29 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     dledford@...hat.com, xavier.huwei@...wei.com, oulijun@...wei.com,
        yisen.zhuang@...wei.com, xuwei5@...ilicon.com,
        mehta.salil.lnk@...il.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com
Subject: Re: [PATCH for-next 20/20] IB/hns: Delete the redundant lines in
 hns_roce_v1_m_qp()

On Fri, Sep 09, 2016 at 06:30:51PM +0800, Salil Mehta wrote:
> From: Lijun Ou <oulijun@...wei.com>
>
> It doesn't need to assign for the filed of qp state in qpc separately
> when qp happen to migrate state which supported in RoCE engine v1.
>
> Signed-off-by: Lijun Ou <oulijun@...wei.com>
> Reviewed-by:  Wei Hu (Xavier) <xavier.huwei@...wei.com>
> Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c |   14 +++-----------
>  1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 7a61d7e..3bc32fc 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -2405,11 +2405,6 @@ static int hns_roce_v1_m_qp(struct ib_qp *ibqp, const struct ib_qp_attr *attr,
>  		roce_set_bit(context->qpc_bytes_140,
>  			     QP_CONTEXT_QPC_BYTES_140_RNR_RETRY_FLG_S, 0);
>
> -		roce_set_field(context->qpc_bytes_144,
> -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_M,
> -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_S,
> -			       attr->qp_state);
> -
>  		roce_set_field(context->qpc_bytes_148,
>  			       QP_CONTEXT_QPC_BYTES_148_CHECK_FLAG_M,
>  			       QP_CONTEXT_QPC_BYTES_148_CHECK_FLAG_S, 0);
> @@ -2524,13 +2519,10 @@ static int hns_roce_v1_m_qp(struct ib_qp *ibqp, const struct ib_qp_attr *attr,
>  		   (cur_state == IB_QPS_RTS && new_state == IB_QPS_ERR) ||
>  		   (cur_state == IB_QPS_ERR && new_state == IB_QPS_RESET) ||
>  		   (cur_state == IB_QPS_ERR && new_state == IB_QPS_ERR)) {
> -		roce_set_field(context->qpc_bytes_144,
> -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_M,
> -			       QP_CONTEXT_QPC_BYTES_144_QP_STATE_S,
> -			       attr->qp_state);
> -
> +		/* It will not do additional options in engine v1 */
> +		;

It will leave empty if() {..}, it is worth to rewrite to have one if for
error path only.

>  	} else {
> -		dev_err(dev, "not support this modify\n");
> +		dev_err(dev, "not support this status migration\n");
>  		goto out;
>  	}
>
> --
> 1.7.9.5
>
> --
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