[PATCH] input: misc: soc_button_array: use platform_device_register_resndata()

[PATCH] input: misc: soc_button_array: use platform_device_register_resndata()

[Enrico Weigelt, metux IT consult]

From: Enrico Weigelt <info@metux.net>

The registration of gpio-keys device can be written much shorter
by using the platform_device_register_resndata() helper.

Signed-off-by: Enrico Weigelt <info@metux.net>
---
 drivers/input/misc/soc_button_array.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index 5e59f8e5..f5e148b 100644
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -110,25 +110,21 @@ static int soc_button_lookup_gpio(struct device *dev, int acpi_index)
 	gpio_keys_pdata->nbuttons = n_buttons;
 	gpio_keys_pdata->rep = autorepeat;
 
-	pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO);
-	if (!pd) {
-		error = -ENOMEM;
+	pd = platform_device_register_resndata(NULL,
+		"gpio-keys",
+		PLATFORM_DEVID_AUTO,
+		NULL,
+		0,
+		gpio_keys_pdata,
+		sizeof(*gpio_keys_pdata));
+
+	if (IS_ERR(pd)) {
+		dev_err(&pdev->dev, "failed registering gpio-keys: %ld\n", PTR_ERR(pd));
 		goto err_free_mem;
 	}
 
-	error = platform_device_add_data(pd, gpio_keys_pdata,
-					 sizeof(*gpio_keys_pdata));
-	if (error)
-		goto err_free_pdev;
-
-	error = platform_device_add(pd);
-	if (error)
-		goto err_free_pdev;
-
 	return pd;
 
-err_free_pdev:
-	platform_device_put(pd);
 err_free_mem:
 	devm_kfree(&pdev->dev, gpio_keys_pdata);
 	return ERR_PTR(error);
-- 
1.9.1

Re: [PATCH] input: misc: soc_button_array: use platform_device_register_resndata()

[Dmitry Torokhov]

On Mon, Jul 29, 2019 at 04:26:12PM +0200, Enrico Weigelt, metux IT consult wrote:
> From: Enrico Weigelt <info@metux.net>
> 
> The registration of gpio-keys device can be written much shorter
> by using the platform_device_register_resndata() helper.
> 
> Signed-off-by: Enrico Weigelt <info@metux.net>
> ---
>  drivers/input/misc/soc_button_array.c | 24 ++++++++++--------------
>  1 file changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
> index 5e59f8e5..f5e148b 100644
> --- a/drivers/input/misc/soc_button_array.c
> +++ b/drivers/input/misc/soc_button_array.c
> @@ -110,25 +110,21 @@ static int soc_button_lookup_gpio(struct device *dev, int acpi_index)
>  	gpio_keys_pdata->nbuttons = n_buttons;
>  	gpio_keys_pdata->rep = autorepeat;
>  
> -	pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO);
> -	if (!pd) {
> -		error = -ENOMEM;
> +	pd = platform_device_register_resndata(NULL,

I wonder if we should pass &pdev->dev instead of NULL here to form
proper device hierarchy, now that we have this option.

> +		"gpio-keys",
> +		PLATFORM_DEVID_AUTO,
> +		NULL,
> +		0,
> +		gpio_keys_pdata,
> +		sizeof(*gpio_keys_pdata));
> +
> +	if (IS_ERR(pd)) {
> +		dev_err(&pdev->dev, "failed registering gpio-keys: %ld\n", PTR_ERR(pd));
>  		goto err_free_mem;

Since you did not assign 'error' value here this goto will result in the
function returning 0 even if platform_device_register_resndata() failed.
I'd doing:

	pd = platform_device_register_resndata(NULL, ...);
	error = PTR_ERR_OR_ZERO(pd);
	if (error) {
		dev_err(...);
		goto err_free_mem;
	}

Thanks.

-- 
Dmitry

Re: [PATCH] input: misc: soc_button_array: use platform_device_register_resndata()

[Enrico Weigelt, metux IT consult]

On 29.07.19 19:23, Dmitry Torokhov wrote:

Hi,

> I wonder if we should pass &pdev->dev instead of NULL here to form
> proper device hierarchy, now that we have this option.

good point, thanks, fixed in v2.


>> +		"gpio-keys",
>> +		PLATFORM_DEVID_AUTO,
>> +		NULL,
>> +		0,
>> +		gpio_keys_pdata,
>> +		sizeof(*gpio_keys_pdata));
>> +
>> +	if (IS_ERR(pd)) {
>> +		dev_err(&pdev->dev, "failed registering gpio-keys: %ld\n", PTR_ERR(pd));
>>   		goto err_free_mem;
> 
> Since you did not assign 'error' value here this goto will result in the
> function returning 0 even if platform_device_register_resndata() failed.

Uh, thanks. IMHO it's even worse: 'error' could be uninitialized.


I'm sending v2 separately.


Thanks for your review.

--mtx

-- 
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287