linux-kernel - Re: [net-next PATCH RFC v6 12/16] net: dsa: qca8k: add support for mdio read/write in Ethernet packet

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Date:   Wed, 15 Dec 2021 14:47:58 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [net-next PATCH RFC v6 12/16] net: dsa: qca8k: add support for
 mdio read/write in Ethernet packet

On Tue, Dec 14, 2021 at 11:44:05PM +0100, Ansuel Smith wrote:
> +static int qca8k_connect_tag_protocol(struct dsa_switch *ds,
> +				      enum dsa_tag_protocol proto)
> +{
> +	struct qca8k_priv *qca8k_priv = ds->priv;
> +
> +	switch (proto) {
> +	case DSA_TAG_PROTO_QCA:
> +		struct tag_qca_priv *priv;

Actually this fails to compile:

drivers/net/dsa/qca8k.c: In function ‘qca8k_connect_tag_protocol’:
drivers/net/dsa/qca8k.c:2893:3: error: a label can only be part of a statement and a declaration is not a statement
 2893 |   struct tag_qca_priv *priv;
      |   ^~~~~~
make[3]: *** [scripts/Makefile.build:287: drivers/net/dsa/qca8k.o] Error 1

This is what the {} brackets are for.

Also, while you're at this, please name "priv" "tagger_data".

> +
> +		priv = ds->tagger_data;
> +
> +		mutex_init(&qca8k_priv->mdio_hdr_data.mutex);
> +		init_completion(&qca8k_priv->mdio_hdr_data.rw_done);
> +
> +		priv->rw_reg_ack_handler = qca8k_rw_reg_ack_handler;
> +
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return 0;
>  }