Re: [PATCH 10/15] iio: sx9310: Simplify error return handling

[Stephen Boyd]

Quoting Daniel Campello (2020-07-28 08:12:53)
> @@ -368,13 +368,13 @@ static int sx9310_wait_for_sample(struct sx9310_data *data)
>  static int sx9310_read_proximity(struct sx9310_data *data,
>                                  const struct iio_chan_spec *chan, int *val)
>  {
> -       int ret = 0;
> +       int ret;
>         __be16 rawval;
>  
>         mutex_lock(&data->mutex);
>  
>         ret = sx9310_get_read_channel(data, chan->channel);
> -       if (ret < 0)
> +       if (ret)
>                 goto out;
>  
>         if (data->client->irq) {
> @@ -394,11 +394,11 @@ static int sx9310_read_proximity(struct sx9310_data *data,
>  
>         mutex_lock(&data->mutex);
>  
> -       if (ret < 0)
> +       if (ret)
>                 goto out_disable_irq;

Why is this condition checked after grabbing the mutex? Shouldn't it be
checked before grabbing the mutex? Or is that supposed to be a
mutex_unlock()?

>  
>         ret = sx9310_read_prox_data(data, chan, &rawval);
> -       if (ret < 0)
> +       if (ret)
>                 goto out_disable_irq;
>  
>         *val = sign_extend32(be16_to_cpu(rawval),