linux-kernel - Re: [net-next PATCH v6 05/16] net: dsa: qca8k: add support for cpu port 6

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Message-Id: <20211013041004.29805-1-dqfext@gmail.com>
Date:   Wed, 13 Oct 2021 12:10:04 +0800
From:   DENG Qingfang <dqfext@...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>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        John Crispin <john@...ozen.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [net-next PATCH v6 05/16] net: dsa: qca8k: add support for cpu port 6

On Wed, Oct 13, 2021 at 03:16:11AM +0200, Ansuel Smith wrote:
> @@ -1017,13 +1033,14 @@ static int
>  qca8k_setup(struct dsa_switch *ds)
>  {
>  	struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
> +	u8 cpu_port;
>  	int ret, i;
>  	u32 mask;
>  
> -	/* Make sure that port 0 is the cpu port */
> -	if (!dsa_is_cpu_port(ds, 0)) {
> -		dev_err(priv->dev, "port 0 is not the CPU port");
> -		return -EINVAL;
> +	cpu_port = qca8k_find_cpu_port(ds);
> +	if (cpu_port < 0) {

cpu_port should be of type int, otherwise this is always false.

> +		dev_err(priv->dev, "No cpu port configured in both cpu port0 and port6");
> +		return cpu_port;
>  	}