netdev - Re: [PATCH net-next v5 07/13] net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver

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Message-ID: <20220519180851.chpqhou7ykt45oty@skbuf>
Date:   Thu, 19 May 2022 21:08:51 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Clément Léger <clement.leger@...tlin.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>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        Pascal Eberhard <pascal.eberhard@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        Jean-Pierre Geslin <jean-pierre.geslin@....se.com>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: Re: [PATCH net-next v5 07/13] net: dsa: rzn1-a5psw: add Renesas
 RZ/N1 advanced 5 port switch driver

On Thu, May 19, 2022 at 05:31:01PM +0200, Clément Léger wrote:
> +static int a5psw_pcs_get(struct a5psw *a5psw)
> +{
> +	struct device_node *ports, *port, *pcs_node;
> +	struct phylink_pcs *pcs;
> +	int ret;
> +	u32 reg;
> +
> +	ports = of_get_child_by_name(a5psw->dev->of_node, "ethernet-ports");
> +	if (!ports)
> +		return -EINVAL;
> +
> +	for_each_available_child_of_node(ports, port) {
> +		pcs_node = of_parse_phandle(port, "pcs-handle", 0);
> +		if (!pcs_node)
> +			continue;
> +
> +		if (of_property_read_u32(port, "reg", &reg)) {
> +			ret = -EINVAL;
> +			goto free_pcs;

I think when you exit the for_each_available_child_of_node() loop you
need to manually call of_node_put(port).

> +		}
> +
> +		if (reg >= ARRAY_SIZE(a5psw->pcs)) {
> +			ret = -ENODEV;
> +			goto free_pcs;
> +		}
> +
> +		pcs = miic_create(pcs_node);
> +		if (IS_ERR(pcs)) {
> +			dev_err(a5psw->dev, "Failed to create PCS for port %d\n",
> +				reg);
> +			ret = PTR_ERR(pcs);
> +			goto free_pcs;
> +		}
> +
> +		a5psw->pcs[reg] = pcs;
> +	}
> +	of_node_put(ports);
> +
> +	return 0;
> +
> +free_pcs:
> +	a5psw_pcs_free(a5psw);
> +	of_node_put(ports);
> +
> +	return ret;
> +}