linux-kernel - Re: [PATCH] ASoC: Intel: bytcht_es8316: Add missed put

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Date:   Tue, 14 Jul 2020 21:29:33 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jing Xiangfeng <jingxiangfeng@...wei.com>,
        cezary.rojewski@...el.com, liam.r.girdwood@...ux.intel.com,
        yang.jie@...ux.intel.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, kuninori.morimoto.gx@...esas.com,
        paul@...pouillou.net
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: Intel: bytcht_es8316: Add missed put_device()

Hi,

On 7/14/20 5:32 PM, Pierre-Louis Bossart wrote:
> 
> 
> On 7/14/20 8:33 AM, Hans de Goede wrote:
>> Hi,
>>
>> On 7/14/20 10:09 AM, Jing Xiangfeng wrote:
>>> snd_byt_cht_es8316_mc_probe() misses to call put_device() in an error
>>> path. Add the missed function call to fix it.
>>>
>>> Fixes: ba49cf6f8e4a ("ASoC: Intel: bytcht_es8316: Add quirk for inverted jack detect")
>>> Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
>>
>> Patch looks good to me:
>>
>> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> 
> Actually the existing code looks quite odd to me:
> 
> if (cnt) {
>      ret = device_add_properties(codec_dev, props);
>      if (ret)
>          return ret;
> }
> 
> devm_acpi_dev_add_driver_gpios(codec_dev, byt_cht_es8316_gpios);
> priv->speaker_en_gpio =
>      gpiod_get_index(codec_dev, "speaker-enable", 0,
>              /* see comment in byt_cht_es8316_resume */
>              GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
> put_device(codec_dev);
> 
> if the first branch is not taken the put_device() will not be balanced.

The get_device() does not come from the device_add_properties, it comes
from the earlier:

codec_dev = bus_find_device_by_name(&i2c_bus_type, NULL, codec_name);

call.

Regards,

Hans



> 
> Shouldn't this be:
> 
> if (cnt) {
>      ret = device_add_properties(codec_dev, props);
>      put_device(codec_dev);
>      if (ret)
>          return ret;
> }
> 
> devm_acpi_dev_add_driver_gpios(codec_dev, byt_cht_es8316_gpios);
> priv->speaker_en_gpio =
>      gpiod_get_index(codec_dev, "speaker-enable", 0,
>              /* see comment in byt_cht_es8316_resume */
>              GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
> /* removed put_device(codec_dev); */
> 
>>
>> Regards,
>>
>> Hans
>>
>>
>>> ---
>>>   sound/soc/intel/boards/bytcht_es8316.c | 4 +++-
>>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/sound/soc/intel/boards/bytcht_es8316.c b/sound/soc/intel/boards/bytcht_es8316.c
>>> index 9e5fc9430628..ecbc58e8a37f 100644
>>> --- a/sound/soc/intel/boards/bytcht_es8316.c
>>> +++ b/sound/soc/intel/boards/bytcht_es8316.c
>>> @@ -543,8 +543,10 @@ static int snd_byt_cht_es8316_mc_probe(struct platform_device *pdev)
>>>       if (cnt) {
>>>           ret = device_add_properties(codec_dev, props);
>>> -        if (ret)
>>> +        if (ret) {
>>> +            put_device(codec_dev);
>>>               return ret;
>>> +        }
>>>       }
>>>       devm_acpi_dev_add_driver_gpios(codec_dev, byt_cht_es8316_gpios);
>>>
>>
>