linux-kernel - Re: [PATCH v3 1/7] usb: misc: onboard_hub: rename to onboard

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Date: Tue, 13 Feb 2024 11:36:25 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Matthias Kaehlcke <mka@...omium.org>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
 Matthias Kaehlcke <matthias@...hlcke.net>
Subject: Re: [PATCH v3 1/7] usb: misc: onboard_hub: rename to onboard_dev

Hi Matthias,

On 06.02.24 18:55, Matthias Kaehlcke wrote:
> Hi Javier,
>
> a few comments inline
>
> On Tue, Feb 06, 2024 at 02:59:29PM +0100, Javier Carrasco wrote:
>> +static struct onboard_dev *_find_onboard_dev(struct device *dev)
>> +{
>> +	struct platform_device *pdev;
>> +	struct device_node *np;
>> +	struct onboard_dev *onboard_dev;
>> +
>> +	pdev = of_find_device_by_node(dev->of_node);
>> +	if (!pdev) {
>> +		np = of_parse_phandle(dev->of_node, "peer-hub", 0);
>> +		if (!np) {
>> +			dev_err(dev, "failed to find device node for peer hub\n");
>> +			return ERR_PTR(-EINVAL);
>> +		}
>> +
>> +		pdev = of_find_device_by_node(np);
>> +		of_node_put(np);
>> +
>> +		if (!pdev)
>> +			return ERR_PTR(-ENODEV);
>> +	}
>
> The above branch should probably be guarded by 'if (!onboard_dev->pdata->is_hub)',
> this is also a change for ""usb: misc: onboard_dev: add support for non-hub devices"
>
I am not sure how to guard the branch like that because onboard_dev is
retrieved by means of pdev->dev, which is not available if
of_find_device_by_node returns NULL. The non-hub device will not have a
peer-hub property according to its bindings anyway, right?

Thanks again for your feedback and best regards,
Javier Carrasco