[PATCH 3/4] iio: fix error return code

[PATCH 3/4] iio: fix error return code

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@lip6.fr>

Convert a zero return value on error to a negative one, as returned
elsewhere in the function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if at p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}

// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/iio/adc/xilinx-xadc-core.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index fd2745c..196e269 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1201,12 +1201,16 @@ static int xadc_probe(struct platform_device *pdev)
 			goto err_device_free;
 
 		xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst");
-		if (IS_ERR(xadc->convst_trigger))
+		if (IS_ERR(xadc->convst_trigger)) {
+			ret = PTR_ERR(xadc->convst_trigger);
 			goto err_triggered_buffer_cleanup;
+		}
 		xadc->samplerate_trigger = xadc_alloc_trigger(indio_dev,
 			"samplerate");
-		if (IS_ERR(xadc->samplerate_trigger))
+		if (IS_ERR(xadc->samplerate_trigger)) {
+			ret = PTR_ERR(xadc->samplerate_trigger);
 			goto err_free_convst_trigger;
+		}
 	}
 
 	xadc->clk = devm_clk_get(&pdev->dev, NULL);

[PATCH 3/4] iio: fix error return code

[Jonathan Cameron]

On 06/08/14 21:12, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> Convert a zero return value on error to a negative one, as returned
> elsewhere in the function.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> (
> if at p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret at p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> 
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
I'll take the view this one is 'obviously' right.  If it isn't
then anyone feel free to shout!

Applied to the togreg branch of iio.git.

Thanks,

Jonathan
> 
> ---
>  drivers/iio/adc/xilinx-xadc-core.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
> index fd2745c..196e269 100644
> --- a/drivers/iio/adc/xilinx-xadc-core.c
> +++ b/drivers/iio/adc/xilinx-xadc-core.c
> @@ -1201,12 +1201,16 @@ static int xadc_probe(struct platform_device *pdev)
>  			goto err_device_free;
>  
>  		xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst");
> -		if (IS_ERR(xadc->convst_trigger))
> +		if (IS_ERR(xadc->convst_trigger)) {
> +			ret = PTR_ERR(xadc->convst_trigger);
>  			goto err_triggered_buffer_cleanup;
> +		}
>  		xadc->samplerate_trigger = xadc_alloc_trigger(indio_dev,
>  			"samplerate");
> -		if (IS_ERR(xadc->samplerate_trigger))
> +		if (IS_ERR(xadc->samplerate_trigger)) {
> +			ret = PTR_ERR(xadc->samplerate_trigger);
>  			goto err_free_convst_trigger;
> +		}
>  	}
>  
>  	xadc->clk = devm_clk_get(&pdev->dev, NULL);
> 
> --
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