linux-kernel - Re: [PATCH] iio: dln2-adc: fix iio_triggered_buffer

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Date:   Sun, 27 Oct 2019 16:56:51 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jack Andersen <jackoalan@...il.com>
Subject: Re: [PATCH] iio: dln2-adc: fix iio_triggered_buffer_postenable()
 position

On Wed, 23 Oct 2019 11:26:34 +0300
Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:

> The iio_triggered_buffer_postenable() hook should be called first to
> attach the poll function. The iio_triggered_buffer_predisable() hook is
> called last (as is it should).
> 
> This change moves iio_triggered_buffer_postenable() to be called first. It
> adds iio_triggered_buffer_predisable() on the error paths of the postenable
> hook.
> For the predisable hook, some code-paths have been changed to make sure
> that the iio_triggered_buffer_predisable() hook gets called in case there
> is an error before it.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
+CC Jack who wrote the driver.

Looks fine to me, but I always like these to sit for a while and ideally get
review from the authors / maintainers of the drivers.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/dln2-adc.c | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/adc/dln2-adc.c b/drivers/iio/adc/dln2-adc.c
> index 5fa78c273a25..65c7c9329b1c 100644
> --- a/drivers/iio/adc/dln2-adc.c
> +++ b/drivers/iio/adc/dln2-adc.c
> @@ -524,6 +524,10 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
>  	u16 conflict;
>  	unsigned int trigger_chan;
>  
> +	ret = iio_triggered_buffer_postenable(indio_dev);
> +	if (ret)
> +		return ret;
> +
>  	mutex_lock(&dln2->mutex);
>  
>  	/* Enable ADC */
> @@ -537,6 +541,7 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
>  				(int)conflict);
>  			ret = -EBUSY;
>  		}
> +		iio_triggered_buffer_predisable(indio_dev);
>  		return ret;
>  	}
>  
> @@ -550,6 +555,7 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
>  		mutex_unlock(&dln2->mutex);
>  		if (ret < 0) {
>  			dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
> +			iio_triggered_buffer_predisable(indio_dev);
>  			return ret;
>  		}
>  	} else {
> @@ -557,12 +563,12 @@ static int dln2_adc_triggered_buffer_postenable(struct iio_dev *indio_dev)
>  		mutex_unlock(&dln2->mutex);
>  	}
>  
> -	return iio_triggered_buffer_postenable(indio_dev);
> +	return 0;
>  }
>  
>  static int dln2_adc_triggered_buffer_predisable(struct iio_dev *indio_dev)
>  {
> -	int ret;
> +	int ret, ret2;
>  	struct dln2_adc *dln2 = iio_priv(indio_dev);
>  
>  	mutex_lock(&dln2->mutex);
> @@ -577,12 +583,14 @@ static int dln2_adc_triggered_buffer_predisable(struct iio_dev *indio_dev)
>  	ret = dln2_adc_set_port_enabled(dln2, false, NULL);
>  
>  	mutex_unlock(&dln2->mutex);
> -	if (ret < 0) {
> +	if (ret < 0)
>  		dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
> -		return ret;
> -	}
>  
> -	return iio_triggered_buffer_predisable(indio_dev);
> +	ret2 = iio_triggered_buffer_predisable(indio_dev);
> +	if (ret == 0)
> +		ret = ret2;
> +
> +	return ret;
>  }
>  
>  static const struct iio_buffer_setup_ops dln2_adc_buffer_setup_ops = {