linux-kernel - Re: [PATCH] leds: leds-gpio: Pass on error codes unmodified

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Date:	Sun, 1 Feb 2015 08:59:54 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	Andreas Färber <afaerber@...e.de>
Cc:	linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH] leds: leds-gpio: Pass on error codes unmodified

+ Andreas who actually reported this issue and also tested the patch.

On Sat, 2015-01-31 at 07:15PM -0800, Soren Brinkmann wrote:
> Instead of overriding error codes, pass them on unmodified. This
> way a EPROBE_DEFER is correctly passed to the driver core. This results
> in the LED driver correctly requesting probe deferral in cases the GPIO
> controller is not yet available.
> 
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>

Here should be a:
Reported-and-tested-by: Andreas Färber <afaerber@...e.de>

> ---
> Adding pinctrl on Zynq shuffled with probing order quite a bit and a lot
> of deferred probing is going on. With those changes I saw the LEDs
> failing to probe due to the GPIO controller deferring probe until the
> pincontroller is available. With this patch things work again:
> 
> dmesg | grep -i led:
>   of_get_named_gpiod_flags: parsed 'gpios' property of node '/leds/ds23[0]' - status (-517)
>   platform leds: Driver leds-gpio requests probe deferral
>   of_get_named_gpiod_flags: parsed 'gpios' property of node '/leds/ds23[0]' - status (0)
> 
>   	Soren
> ---
>  drivers/leds/leds-gpio.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
> index 7ea1ea42c2d2..d26af0a79a90 100644
> --- a/drivers/leds/leds-gpio.c
> +++ b/drivers/leds/leds-gpio.c
> @@ -187,6 +187,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
>  		led.gpiod = devm_get_gpiod_from_child(dev, child);
>  		if (IS_ERR(led.gpiod)) {
>  			fwnode_handle_put(child);
> +			ret = PTR_ERR(led.gpiod);
>  			goto err;
>  		}
>  
> @@ -229,7 +230,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
>  err:
>  	for (count = priv->num_leds - 2; count >= 0; count--)
>  		delete_gpio_led(&priv->leds[count]);
> -	return ERR_PTR(-ENODEV);
> +	return ERR_PTR(ret);
>  }
>  
>  static const struct of_device_id of_gpio_leds_match[] = {
> -- 
> 2.2.2.1.g63c5777
> 
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