netdev - Re: [PATCH mlx5-next v1 1/4] {IB/net}/mlx5: Simplify don't trap code

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Date:   Fri, 8 May 2020 16:58:38 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Maor Gottlieb <maorg@...lanox.com>, linux-rdma@...r.kernel.org,
        Mark Bloch <markb@...lanox.com>,
        Mark Zhang <markz@...lanox.com>, netdev@...r.kernel.org,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [PATCH mlx5-next v1 1/4] {IB/net}/mlx5: Simplify don't trap code

On Mon, May 04, 2020 at 08:30:09AM +0300, Leon Romanovsky wrote:
> +	flow_act->action &=
> +		~MLX5_FLOW_CONTEXT_ACTION_FWD_NEXT_PRIO;
> +	flow_act->action |= MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
> +	handle = _mlx5_add_flow_rules(ft, spec, flow_act, dest, num_dest);
> +	if (IS_ERR_OR_NULL(handle))
> +		goto unlock;

I never like seeing IS_ERR_OR_NULL()..

In this case I see callers of mlx5_add_flow_rules() that crash if it
returns NULL, so this can't be right.

Also, I don't see an obvious place where _mlx5_add_flow_rules()
returns NULL, does it?

Jason