linux-kernel - Re: [PATCH v7 3/6] media: starfive: camss: Add basic driver

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Date:   Wed, 26 Jul 2023 11:55:53 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Jack Zhu <jack.zhu@...rfivetech.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Foss <rfoss@...nel.org>,
        Todor Tomov <todor.too@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Eugen Hristev <eugen.hristev@...labora.com>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, changhuang.liang@...rfivetech.com
Subject: Re: [PATCH v7 3/6] media: starfive: camss: Add basic driver

On 19/06/2023 12:28, Jack Zhu wrote:

> +static int stfcamss_of_parse_ports(struct stfcamss *stfcamss)
> +{
> +	struct device *dev = stfcamss->dev;
> +	struct device_node *node = NULL;
> +	int ret, num_subdevs = 0;
> +
> +	for_each_endpoint_of_node(dev->of_node, node) {
> +		struct stfcamss_async_subdev *csd;
> +
> +		if (!of_device_is_available(node))
> +			continue;
> +
> +		csd = v4l2_async_nf_add_fwnode_remote(&stfcamss->notifier,
> +						      of_fwnode_handle(node),
> +						      struct stfcamss_async_subdev);
> +		if (IS_ERR(csd)) {
> +			ret = PTR_ERR(csd);
> +			goto err_cleanup;
> +		}
> +
> +		ret = stfcamss_of_parse_endpoint_node(dev, node, csd);
> +		if (ret < 0)
> +			goto err_cleanup;
> +
> +		num_subdevs++;
> +	}
> +
> +	return num_subdevs;
> +
> +err_cleanup:
> +	of_node_put(node);

Where is the _get() for this and if you are releasing it on the error 
path when is the _get() released on the non-error path ?

> +	return ret;
> +}
> +
> +static int stfcamss_subdev_notifier_bound(struct v4l2_async_notifier *async,
> +					  struct v4l2_subdev *subdev,
> +					  struct v4l2_async_subdev *asd)
> +{
> +	struct media_pad *pad[STF_PADS_NUM];
> +	unsigned int i, pad_num = 0;
> +
> +	for (i = 0; i < pad_num; ++i) {

Does this loop ever run ?
I don't see how it can..

---
bod