linux-kernel - Re: [PATCH V1 2/3] taging: android: ion: Add ion driver for Hi6220 SoC platform

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Message-ID: <561B0995.8080204@hisilicon.com>
Date:	Mon, 12 Oct 2015 09:15:01 +0800
From:	chenfeng <puck.chen@...ilicon.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	<gregkh@...uxfoundation.org>, <arve@...roid.com>,
	<riandrews@...roid.com>, <tranmanphong@...il.com>,
	<mitchelh@...eaurora.org>, <tapaswenipathak@...il.com>,
	<sumit.semwal@...aro.org>, <paul.gortmaker@...driver.com>,
	<gioh.kim@....com>, <devel@...verdev.osuosl.org>,
	<linux-kernel@...r.kernel.org>, <yudongbin@...ilicon.com>,
	<saberlily.xia@...ilicon.com>, <suzhuangluan@...ilicon.com>,
	<kong.kongxinwei@...ilicon.com>, <xuyiping@...ilicon.com>,
	<z.liuxinliang@...ilicon.com>, <weidong2@...ilicon.com>,
	<w.f@...wei.com>, <qijiwen@...ilicon.com>,
	<peter.panshilin@...ilicon.com>, <dan.zhao@...ilicon.com>,
	<linuxarm@...wei.com>
Subject: Re: [PATCH V1 2/3] taging: android: ion: Add ion driver for Hi6220
 SoC platform



On 2015/10/10 23:00, Dan Carpenter wrote:
> On Sat, Oct 10, 2015 at 02:48:22PM +0800, Chen Feng wrote:
>> +static int hi6220_ion_probe(struct platform_device *pdev)
>> +{
>> +	int i;
>> +	int err = 0;
>> +	static struct ion_platform_heap *p_heap;
>> +
>> +	idev = ion_device_create(NULL);
>> +	hi6220_set_platform_data(pdev);
>> +	heaps = devm_kzalloc(&pdev->dev,
>> +			     sizeof(struct ion_heap *) * num_heaps,
>> +			     GFP_KERNEL);
>> +	if (!heaps)
>> +		return -ENOMEM;
>> +
>> +	/*
>> +	 * create the heaps as specified in the dts file
>> +	 */
>> +	for (i = 0; i < num_heaps; i++) {
>> +		p_heap = heaps_data[i];
>> +		heaps[i] = ion_heap_create(p_heap);
>> +		if (IS_ERR_OR_NULL(heaps[i])) {
>> +			err = PTR_ERR(heaps[i]);
>> +			goto err_free_heaps;
>> +		}
>> +
>> +		ion_device_add_heap(idev, heaps[i]);
>> +
>> +		pr_info("%s: adding heap %s of type %d with %lx@%lx\n",
>> +			__func__, p_heap->name, p_heap->type,
>> +			p_heap->base, (unsigned long)p_heap->size);
>> +	}
>> +	return err;
>> +
>> +err_free_heaps:
>> +	ion_device_destroy(idev);
>> +	for (i = 0; i < num_heaps; ++i) {
>> +		ion_heap_destroy(heaps[i]);
>> +		heaps[i] = NULL;
>> +	}
>> +
>> +	return err;
>> +}
> 
> Thanks this is better but still not quite right.  You have to unwind in
> the reverse order from how you allocated things.
> 
> err_free_heaps:
> 	for (i = 0; i < num_heaps; ++i) {
> 		ion_heap_destroy(heaps[i]);
> 		heaps[i] = NULL;
> 	}
> err_destroy_idev:
> 	ion_device_destroy(idev);
> 
> 	return err;
> 
> And earlier it should be:
> 
>  	idev = ion_device_create(NULL);
>  	hi6220_set_platform_data(pdev);
>  	heaps = devm_kzalloc(&pdev->dev,
>  			     sizeof(struct ion_heap *) * num_heaps,
>  			     GFP_KERNEL);
> -	if (!heaps)
> -		return -ENOMEM;
> +	if (!heaps) {
> +		err = -ENOMEM;
> +		goto err_destroy_idev;
> +	}
> 
> Otherwise we leak some resources if we can't allocate "heaps".
> 
Yeah,it's right. I will fix this.

> regards,
> dan carpenter
> 
> 
> .
> 

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