[PATCH v2 1/2] ARM: mxc: Introduce imx_add_gpio_leds

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Tue, Apr 05, 2011 at 09:30:30AM +0200, Uwe Kleine-K?nig wrote:
> I like my approach better, without using mxc specific functions it would
> look as follows:
> 
> struct platform_device *__init gpio_led_register_device(
> 		const gpio_led_platform_data *pdata)
> {
> 	struct platform_device *ret = ERR_PTR(-ENOMEM);
> 	struct gpio_led_platform_data *_pdata = *pdata;
> 	_pdata->leds = kmemdup(pdata->leds,
> 			 pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
> 
> 	if (!_pdata->leds)
> 		return ERR_PTR(-ENOMEM);
> 
> 	ret = platform_device_register_resndata(NULL, "leds-gpio", -1,
> 		NULL, 0, _pdata, sizeof(_pdata));
> 
> 	if (IS_ERR(ret))
> 		kfree(_pdata->leds);
> 
> 	return ret;
> }

But this is inconsistent.  The gpio_led_platform_data isn't copied,
but a sub-structure is - which makes this a candidate for people adding
__initdata to the wrong thing.  Also marking the LEDs array as __initdata
but leaving the gpio_led_platform_data without __initdata will lead to
warnings.