Re: [PATCH v2 4/4] leds: no longer use unnamed gpios

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Olliver,

On Wed, Jan 21, 2015 at 10:33:48PM +0100, Olliver Schinagl wrote:
> diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
> index 097d721..eadb472 100644
> --- a/drivers/input/keyboard/gpio_keys_polled.c
> +++ b/drivers/input/keyboard/gpio_keys_polled.c
> @@ -125,15 +125,19 @@ static struct gpio_keys_platform_data *gpio_keys_polled_get_devtree_pdata(struct
>  	device_for_each_child_node(dev, child) {
>  		struct gpio_desc *desc;
>  
> -		desc = devm_get_gpiod_from_child(dev, NULL, child);
> +		desc = devm_get_gpiod_from_child(dev, "gpio_keys_polled",
> +						 child);
>  		if (IS_ERR(desc)) {
> -			error = PTR_ERR(desc);
> -			if (error != -EPROBE_DEFER)
> -				dev_err(dev,
> -					"Failed to get gpio flags, error: %d\n",
> -					error);
> -			fwnode_handle_put(child);
> -			return ERR_PTR(error);
> +			desc = devm_get_gpiod_from_child(dev, NULL, child);
> +			if (IS_ERR(desc)) {
> +				error = PTR_ERR(desc);
> +				if (error != -EPROBE_DEFER)
> +					dev_err(dev,
> +						"Failed to get gpio flags, error: %d\n",
> +						error);
> +				fwnode_handle_put(child);
> +				return ERR_PTR(error);
> +			}
>  		}
>  

I do not think this is correct. If devm_get_gpiod_from_child(dev,
"gpio_keys_polled", child) retruns -EPROBE_DEFER we'll try
devm_get_gpiod_from_child(dev, NULL, child). If that returns some other
error we'll fail probing entire driver.

Did I mention how *I HATE* the -EPROBE_DEFER (the error that is not an
error)?

Thanks.

-- 
Dmitry