netdev - Re: [RFC PATCH net-next v4 08/28] net: dsa: qca8k: handle error with qca8k

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Date:   Sat, 8 May 2021 19:46:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v4 08/28] net: dsa: qca8k: handle error with
 qca8k_read operation

>  static int
>  qca8k_fdb_next(struct qca8k_priv *priv, struct qca8k_fdb *fdb, int port)
>  {
> -	int ret;
> +	int ret, ret_read;
>  
>  	qca8k_fdb_write(priv, fdb->vid, fdb->port_mask, fdb->mac, fdb->aging);
>  	ret = qca8k_fdb_access(priv, QCA8K_FDB_NEXT, port);
> -	if (ret >= 0)
> -		qca8k_fdb_read(priv, fdb);
> +	if (ret >= 0) {
> +		ret_read = qca8k_fdb_read(priv, fdb);
> +		if (ret_read < 0)
> +			return ret_read;
> +	}

This is O.K, but it is a bit of an odd structure. How about

  	qca8k_fdb_write(priv, fdb->vid, fdb->port_mask, fdb->mac, fdb->aging);
	ret = qca8k_fdb_access(priv, QCA8K_FDB_NEXT, port);
	if (ret < 0)
		return ret;

	return qca8k_fdb_read(priv, fdb);
}

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew