linux-kernel - Re: [PATCH 2/2] gpio: msm7200a: Add irq support to msm-gpiolib.

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Message-ID: <4C12C567.3060704@codeaurora.org>
Date:	Fri, 11 Jun 2010 16:23:19 -0700
From:	Greg Bean <gbean@...eaurora.org>
To:	Daniel Walker <dwalker@...eaurora.org>
CC:	akpm@...ux-foundation.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Brown <davidb@...eaurora.org>,
	Bryan Huntsman <bryanh@...eaurora.org>
Subject: Re: [PATCH 2/2] gpio: msm7200a: Add irq support to msm-gpiolib.

>> +	/*
>> +	 * Under no circumstances should a line be held on a gpiochip
>> +	 * which hasn't finished probing.
>> +	 */
>> +	BUG_ON(gpiochip_remove(&msm_gpio->gpio_chip)<  0);
>> +err_post_malloc:
>
> It looks like some of this should go in the prior patch. Like this
> BUG_ON() above.

I would argue against that.  If you look at the previous patch, you'll 
see that the last thing that probe() does is gpiochip_add, which means 
it never has a need to call gpiochip_remove(), and thus no need to 
complain if gpiochip_remove behaves unexpectedly.

>> @@ -160,12 +360,16 @@ err:
>>   static int msm_gpio_remove(struct platform_device *dev)
>>   {
>>   	struct msm_gpio_dev *msm_gpio = platform_get_drvdata(dev);
>> -	int ret = gpiochip_remove(&msm_gpio->gpio_chip);
>> +	int ret;
>>
>> -	if (ret == 0)
>> -		kfree(msm_gpio);
>> +	ret = gpiochip_remove(&msm_gpio->gpio_chip);
>> +	if (ret<  0)
>> +		return ret;
>>
>> -	return ret;
>> +	free_irq(msm_gpio->irq_summary, msm_gpio);
>> +	kfree(msm_gpio);
>> +
>> +	return 0;
>>   }
>
> Also some of the code here (msm_gpio_remove) seems like it's cleaning up
> the prior patch to some degree. So it should potentially get moved into
> that patch.

Point taken.  There is definitely some stuff in here that is just 
"housecleaning" - I will sort that out.

---
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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