linux-kernel - Re: [PATCH v2 5/9] ASoC: tegra: add Tegra210 based AHUB driver

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Date:   Tue, 4 Feb 2020 10:04:37 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <robh+dt@...nel.org>
CC:     <spujar@...dia.com>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>
Subject: Re: [PATCH v2 5/9] ASoC: tegra: add Tegra210 based AHUB driver



On 1/30/2020 10:39 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
>
>
> 30.01.2020 13:33, Sameer Pujar пишет:
> ...
>> +     ret = devm_snd_soc_register_component(&pdev->dev,
>> +                                           ahub->soc_data->cmpnt_drv,
>> +                                           ahub->soc_data->dai_drv,
>> +                                           ahub->soc_data->num_dais);
>> +     if (ret < 0) {
>> +             dev_err(&pdev->dev, "failed to register component, err: %d\n",
>> +                     ret);
>> +             return ret;
>> +     }
> In the the patch #4 ("ASoC: tegra: add Tegra210 based I2S driver") I see
> the following:
>
>          ret = devm_snd_soc_register_component(dev, &tegra210_i2s_cmpnt,
>                                          tegra210_i2s_dais,
>                                          ARRAY_SIZE(tegra210_i2s_dais));
>          if (ret != 0) {
>                  dev_err(dev, "can't register I2S component, err: %d\n", ret);
>                  return ret;
>          }
>
> Please be consistent in regards to errors checking. The correct variant
> should be: if (ret != 0). Usually error codes are a negative value, but
> it is much safer to check whether value isn't 0 in all cases where
> positive value isn't expected to happen.

yes "if (ret)" is good enough in such cases.
>
> I'd also recommend to rename all "ret" variables to "err" everywhere in
> the code where returned value is used only for errors checking. This
> will make code more explicit, and hence, easier to read and follow.

OK, I will update it to 'err' for better.
>
> So, it will be nicer to write it as:
>
>          err = devm_snd_soc_register_component(&pdev->dev,
>                                          ahub->soc_data->cmpnt_drv,
>                                          ahub->soc_data->dai_drv,
>                                          ahub->soc_data->num_dais);
>          if (err) {
>                  dev_err(&pdev->dev, "failed to register component: %d\n", err);
>                  return err;
>          }