Re: [PATCH] ASoC: Intel: bytcht_es8316: Add missed put_device()

[Hans de Goede <hdegoede@xxxxxxxxxx>]

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@xxxxxxxxxx>
> >
> > Patch looks good to me:
> >
> > Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
>
> 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);