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

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