linux-kernel - Re: [PATCH for-next 03/20] IB/hns: Add the check for pointer ctrl

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Message-ID: <20160915100757.GW26069@leon.nu>
Date:   Thu, 15 Sep 2016 13:07:57 +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 03/20] IB/hns: Add the check for pointer ctrl

On Fri, Sep 09, 2016 at 06:30:34PM +0800, Salil Mehta wrote:
> From: Lijun Ou <oulijun@...wei.com>
>
> The pointer ctrl may be null, so we add check for it.
>
> Signed-off-by: Lijun Ou <oulijun@...wei.com>
> Reviewed-by: Wei Hu <xavier.huwei@...wei.com>
> Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> ---
>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c |    6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index 5f76fc1..ea47ec4 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -336,6 +336,12 @@ int hns_roce_v1_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
>  		}
>
>  		ctrl = get_recv_wqe(hr_qp, ind);
> +		if (unlikely(!ctrl)) {

Yes, as you wrote, this check and patch are redundant too.

> +			dev_err(dev, "Get recv wqe failed!\n");
> +			ret = -EINVAL;
> +			*bad_wr = wr;
> +			goto out;
> +		}
>
>  		roce_set_field(ctrl->rwqe_byte_12,
>  			       RQ_WQE_CTRL_RWQE_BYTE_12_RWQE_SGE_NUM_M,
> --
> 1.7.9.5
>
> --
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