linux-kernel - Re: [PATCH v4] hwmon: add POWER-Z driver

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Date:   Sat, 2 Sep 2023 18:36:17 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     linux@...ssschuh.net >> Thomas Weißschuh 
        <linux@...ssschuh.net>
Cc:     dgilbert@...erlog.com, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux@...ck-us.net
Subject: Re: [PATCH v4] hwmon: add POWER-Z driver

Le 02/09/2023 à 09:47, Thomas Weißschuh a écrit :
> POWER-Z is a series of devices to monitor power characteristics of
> USB-C connections and display those on a on-device display.
> Some of the devices, notably KM002C and KM003C, contain an additional
> port which exposes the measurements via USB.
> 
> This is a driver for this monitor port.
> 
> It was developed and tested with the KM003C.
> 
> Signed-off-by: Thomas Weißschuh <linux-9XfqOkM5JgxKQ7RDE2T8Pw@...lic.gmane.org>
> ---

...

> +static int powerz_probe(struct usb_interface *intf,
> +			const struct usb_device_id *id)
> +{
> +	struct powerz_priv *priv;
> +	struct device *hwmon_dev;
> +	struct device *parent;
> +
> +	parent = &intf->dev;
> +
> +	priv = devm_kzalloc(parent, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->urb = usb_alloc_urb(0, GFP_KERNEL);
> +	if (!priv->urb)
> +		return -ENOMEM;
> +	mutex_init(&priv->mutex);
> +	priv->status = -ETIMEDOUT;
> +	init_completion(&priv->completion);
> +
> +	hwmon_dev =
> +	    devm_hwmon_device_register_with_info(parent, DRIVER_NAME, priv,
> +						 &powerz_chip_info, NULL);
> +	usb_set_intfdata(intf, priv);
> +
> +	return PTR_ERR_OR_ZERO(hwmon_dev);

Hi,

If 'hwmon_dev' is an PTR_ERR, priv->urb leaks.

CJ

> +}
> +

...