[PATCH] rtc: at91rm9200: fix error return code in at91_rtc_probe()

[PATCH] rtc: at91rm9200: fix error return code in at91_rtc_probe()

[Gustavo A. R. Silva]

platform_get_irq() returns an error code, but the at91rm9200 driver
ignores it and always returns -ENXIO. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Print and propagate the return value of platform_get_irq on failure.

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/rtc/rtc-at91rm9200.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index e221b78..09bc2e0 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -398,8 +398,8 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "no irq resource defined\n");
-		return -ENXIO;
+		dev_err(&pdev->dev, "no irq resource defined: %d\n", irq);
+		return irq;
 	}
 
 	at91_rtc_regs = devm_ioremap(&pdev->dev, regs->start,
-- 
2.5.0

Re: [PATCH] rtc: at91rm9200: fix error return code in at91_rtc_probe()

[Alexandre Belloni]

On 09/08/2017 at 10:52:44 -0500, Gustavo A. R. Silva wrote:
> platform_get_irq() returns an error code, but the at91rm9200 driver
> ignores it and always returns -ENXIO. This is not correct and,
> prevents -EPROBE_DEFER from being propagated properly.
> 
> Print and propagate the return value of platform_get_irq on failure.
> 
> This issue was detected with the help of Coccinelle.
> 

This will never happen and is not an actual issue. I will not take such
a patch until you
1/ prove there is an issue
2/ test your patch on real hardware

> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
>  drivers/rtc/rtc-at91rm9200.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
> index e221b78..09bc2e0 100644
> --- a/drivers/rtc/rtc-at91rm9200.c
> +++ b/drivers/rtc/rtc-at91rm9200.c
> @@ -398,8 +398,8 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
>  
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq < 0) {
> -		dev_err(&pdev->dev, "no irq resource defined\n");
> -		return -ENXIO;
> +		dev_err(&pdev->dev, "no irq resource defined: %d\n", irq);
> +		return irq;
>  	}
>  
>  	at91_rtc_regs = devm_ioremap(&pdev->dev, regs->start,
> -- 
> 2.5.0
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com