netdev - Re: [PATCH net-next 3/4] net: phy: marvell10g: Add LED support for 88X3310

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Date: Mon, 18 Dec 2023 15:55:40 +0000
From: Simon Horman <horms@...nel.org>
To: Tobias Waldekranz <tobias@...dekranz.com>
Cc: davem@...emloft.net, kuba@...nel.org, linux@...linux.org.uk,
	kabel@...nel.org, andrew@...n.ch, hkallweit1@...il.com,
	robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 3/4] net: phy: marvell10g: Add LED support for
 88X3310

On Thu, Dec 14, 2023 at 09:14:41PM +0100, Tobias Waldekranz wrote:
> Pickup the LEDs from the state in which the hardware reset or
> bootloader left them, but also support further configuration via
> device tree. This is primarily needed because the electrical polarity
> and drive behavior is software controlled and not possible to set via
> hardware strapping.
> 
> Trigger support:
> - "none"
> - "timer": Map 60-100 ms periods to the fast rate (81ms) and 1000-1600
>   	   ms periods to the slow rate (1300ms). Defer everything else to
> 	   software blinking
> - "netdev": Offload link or duplex information to the solid behavior;
>   	    tx and/or rx activity to blink behavior.
> 
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>

...

> +static int mv3310_leds_probe(struct phy_device *phydev)
> +{
> +	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
> +	struct device_node *node = phydev->mdio.dev.of_node;
> +	struct device_node *pnp, *np;
> +	int err, val, index;
> +
> +	/* Save the config left by HW reset or bootloader, to make
> +	 * sure that we do not loose any polarity config made by
> +	 * firmware. This will be overridden by info from DT, if
> +	 * available.
> +	 */
> +	for (index = 0; index < MV3310_N_LEDS; index++) {
> +		val = phy_read_mmd(phydev, MDIO_MMD_VEND2,
> +				   MV_V2_LED0_CONTROL + index);
> +		if (val < 0)
> +			return val;
> +
> +		priv->led[index] = (struct mv3310_led) {
> +			.index = index,
> +			.fw_ctrl = val,
> +		};
> +	}
> +
> +	if (!node)
> +		return 0;
> +
> +	pnp = of_get_child_by_name(node, "leds");
> +	if (!pnp)
> +		return 0;
> +
> +	for_each_available_child_of_node(pnp, np) {
> +		err = mv3310_led_probe_of(phydev, np);
> +		if (err)

Hi Tobias,

I think a call to of_node_put(np) is required here to avoid leaking a
reference.

Flagged by Coccinelle.

> +			return err;
> +	}
> +
> +	return 0;
> +}

...