linux-kernel - Re: [PATCH v8 net-next 05/10] net: dsa: microchip: add DSA support for microchip lan937x

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Date:   Mon, 7 Feb 2022 19:28:00 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
Cc:     andrew@...n.ch, netdev@...r.kernel.org, robh+dt@...nel.org,
        UNGLinuxDriver@...rochip.com, woojung.huh@...rochip.com,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v8 net-next 05/10] net: dsa: microchip: add DSA support
 for microchip lan937x

On Mon, Feb 07, 2022 at 10:51:59PM +0530, Prasanna Vengateshan wrote:
> +static int lan937x_parse_dt_rgmii_delay(struct ksz_device *dev)
> +{
> +	struct device_node *ports, *port;
> +	int err, p;
> +	u32 val;
> +
> +	ports = of_get_child_by_name(dev->dev->of_node, "ports");
> +	if (!ports)
> +		ports = of_get_child_by_name(dev->dev->of_node,
> +					     "ethernet-ports");
> +	if (!ports) {
> +		dev_err(dev->dev, "no ports child node found\n");
> +		return -EINVAL;
> +	}
> +
> +	for_each_available_child_of_node(ports, port) {
> +		err = of_property_read_u32(port, "reg", &p);
> +		if (err) {
> +			dev_err(dev->dev, "Port num not defined in the DT, \"reg\" property\n");
> +			of_node_put(ports);
> +			of_node_put(port);
> +			return err;
> +		}
> +
> +		/* skip for internal ports */
> +		if (lan937x_is_internal_phy_port(dev, p))
> +			continue;
> +
> +		if (of_property_read_u32(port, "rx-internal-delay-ps", &val))
> +			val = 0;
> +
> +		err = lan937x_set_rgmii_delay(dev, p, val, false);
> +		if (err)

I think this call and the one below are missing calls to of_node_put()
on error.

> +			return err;
> +
> +		if (of_property_read_u32(port, "tx-internal-delay-ps", &val))
> +			val = 0;
> +
> +		err = lan937x_set_rgmii_delay(dev, p, val, true);
> +		if (err)
> +			return err;
> +	}
> +
> +	of_node_put(ports);
> +	return 0;
> +}