linux-kernel - Re: [PATCH v3] mfd: ch341: add driver for the WCH CH341 in I2C/GPIO mode

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Date:   Tue, 15 Mar 2022 15:30:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     frank zago <frank@...o.net>
Cc:     linux-kernel@...r.kernel.org,
        Jan-Niklas Burfeind <kernel@...ionpri.me>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>, Johan Hovold <johan@...nel.org>,
        linux-usb@...r.kernel.org, gunar@...orcht.net,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v3] mfd: ch341: add driver for the WCH CH341 in I2C/GPIO
 mode

On Sun, Mar 13, 2022 at 10:09:37PM -0500, frank zago wrote:
> +static int ch341_usb_probe(struct usb_interface *iface,
> +			   const struct usb_device_id *usb_id)
> +{
> +	struct usb_host_endpoint *endpoints;
> +	struct ch341_device *dev;
> +	int rc;
> +
> +	dev = kzalloc(sizeof(struct ch341_device), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	dev->usb_dev = usb_get_dev(interface_to_usbdev(iface));
> +	dev->iface = iface;
> +	mutex_init(&dev->usb_lock);
> +
> +	if (iface->cur_altsetting->desc.bNumEndpoints != 3) {
> +		rc = -EIO;

-ENODEV is the proper one here.

> +		goto free_dev;
> +	}
> +
> +	endpoints = iface->cur_altsetting->endpoint;
> +	if (!usb_endpoint_is_bulk_in(&endpoints[0].desc) ||
> +	    !usb_endpoint_is_bulk_out(&endpoints[1].desc) ||
> +	    !usb_endpoint_xfer_int(&endpoints[2].desc)) {
> +		rc = -EIO;

Same here.

thanks,

greg k-h