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

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Message-ID: <995e6991-6635-0c0e-d50c-5b6fe2ce6655@starfivetech.com>
Date:   Thu, 27 Jul 2023 06:14:41 +0800
From:   Jack Zhu <jack.zhu@...rfivetech.com>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        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

Hi Bryan,

Thank you for your comments.

On 2023/7/26 18:55, Bryan O'Donoghue wrote:
> 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 ?
> 

OK, I will fix it.

>> +    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..
> 

OK, I will fix it, although there are modifications to this code in patch 5 and patch 6.

> ---
> bod

-- 
Regards,

Jack Zhu