netdev - Re: [PATCH net-next v3 1/5] devlink: Reduce struct devlink exposure

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Message-ID: <20211007155800.1ff26948@gandalf.local.home>
Date:   Thu, 7 Oct 2021 15:58:00 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Leon Romanovsky <leonro@...dia.com>,
        Ido Schimmel <idosch@...dia.com>,
        Ingo Molnar <mingo@...hat.com>, Jiri Pirko <jiri@...dia.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        mlxsw@...dia.com, Moshe Shemesh <moshe@...dia.com>,
        netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Shay Drory <shayd@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>
Subject: Re: [PATCH net-next v3 1/5] devlink: Reduce struct devlink exposure

On Thu,  7 Oct 2021 09:55:15 +0300
Leon Romanovsky <leon@...nel.org> wrote:

> +void *devlink_priv(struct devlink *devlink)
> +{
> +	BUG_ON(!devlink);

Do we really want to bring down the kernel in this case?

Can't we just have:

	if (WARN_ON(!devlink))
		return NULL;
?

Same for the below as well.

-- Steve

> +	return &devlink->priv;
> +}
> +EXPORT_SYMBOL_GPL(devlink_priv);
> +
> +struct devlink *priv_to_devlink(void *priv)
> +{
> +	BUG_ON(!priv);
> +	return container_of(priv, struct devlink, priv);
> +}
> +EXPORT_SYMBOL_GPL(priv_to_devlink);
> +
> +struct device *devlink_to_dev(const struct devlink *devlink)
> +{
> +	return devlink->dev;
> +}
> +EXPORT_SYMBOL_GPL(devlink_to_dev);
> +