netdev - Re: [PATCHv3 1/4] rds: ib: drop unnecessary rdma

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Date:   Mon, 13 Mar 2017 08:32:24 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Zhu Yanjun <yanjun.zhu@...cle.com>
Cc:     santosh.shilimkar@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, rds-devel@....oracle.com
Subject: Re: [PATCHv3 1/4] rds: ib: drop unnecessary rdma_reject

On Mon, Mar 13, 2017 at 01:43:45AM -0400, Zhu Yanjun wrote:
> When rdma_accept fails, rdma_reject is called in it. As such, it is
> not necessary to execute rdma_reject again.

It is not always correct, according to the code, rdma_accept can fail
and will return EINVAL and skip calling to rdma_reject.

3725 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3726 {
3727         struct rdma_id_private *id_priv;
3728         int ret;
3729
3730         id_priv = container_of(id, struct rdma_id_private, id);
3731
3732         id_priv->owner = task_pid_nr(current);
3733
3734         if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3735                 return -EINVAL;
3736


>
> Cc: Joe Jin <joe.jin@...cle.com>
> Cc: Junxiao Bi <junxiao.bi@...cle.com>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
> Signed-off-by: Zhu Yanjun <yanjun.zhu@...cle.com>
> ---
>  net/rds/ib_cm.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
> index ce3775a..4b9405c 100644
> --- a/net/rds/ib_cm.c
> +++ b/net/rds/ib_cm.c
> @@ -677,9 +677,8 @@ int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
>  		event->param.conn.initiator_depth);
>
>  	/* rdma_accept() calls rdma_reject() internally if it fails */
> -	err = rdma_accept(cm_id, &conn_param);
> -	if (err)
> -		rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
> +	if (rdma_accept(cm_id, &conn_param))
> +		rds_ib_conn_error(conn, "rdma_accept failed\n");
>
>  out:
>  	if (conn)
> --
> 2.7.4
>

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