linux-kernel - Re: [PATCH 2.6.27-rc3] led: driver for LEDs on PCEngines ALIX.2 and ALIX.3 boards

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Message-ID: <48B044DC.5040700@const.mimas.ru>
Date:	Sat, 23 Aug 2008 22:11:56 +0500
From:	Constantin Baranov <const@...st.mimas.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, rpurdie@...ys.net
Subject: Re: [PATCH 2.6.27-rc3] led: driver for LEDs on PCEngines ALIX.2 and
 ALIX.3 boards

Andrew Morton wrote:
> On Sat, 23 Aug 2008 02:08:15 +0500
> Constantin Baranov <const@...st.mimas.ru> wrote:
> 
>>>  static int alix_led_resume(struct platform_device *dev)
>>>  {
>>>  	int i;
>>> +
>>>  	for (i = 0; i < ARRAY_SIZE(alix_leds); i++)
>>>  		led_classdev_resume(&alix_leds[i].cdev);
>>>  	return 0;
>>> @@ -92,7 +95,7 @@ static int __init alix_led_probe(struct 
>>>  		ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
>>>  
>>>  	if (ret < 0) {
>>> -		for (i = i - 2; i >= 0; i--)
>>> +		while (--i >= 0)
>>>  			led_classdev_unregister(&alix_leds[i].cdev);
>>>  	}
>> At the first iteration this while-loop will attempt to unregister
>> device that has failed and thus is not registered.
>> My for-loop starts from device immediately before failed one.
> 
> ug, OK, the complex expression in that for-loop is to blame.
> 
> For maintinability we should aim for code which is as simple and as
> straightfroward as possible and which adheres to oft-used and
> well-understood kernel idioms.
> 
> For example, this?
> 
> static int __init alix_led_probe(struct platform_device *pdev)
> {
> 	int i;
> 	int ret;
> 
> 	for (i = 0; i < ARRAY_SIZE(alix_leds); i++) {
> 		ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev);
> 		if (ret < 0)
> 			goto fail;
> 	}
> 	return 0;
> 
> fail:
> 	while (--i >= 0)
> 		led_classdev_unregister(&alix_leds[i].cdev);
> 	return ret;
> }
> 
> (note there's no longer a need for a fake initalisation of `ret')
> 
>> Note that probe routine originates from leds-ams-delta.c.
> 
> That's what you get for copying stuff :(

Well, this variant looks better and correct and still works.
Should I post again patch or fix-patch?
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