Subject: [PATCH v2] ARM: pxa: ssp: remove unnessary free for devm_xxx

From: [email-masked] (Firo Yang)
Date: Mon, 8 Jun 2015 16:19:36 +0800

On Mon, Jun 08, 2015 at 10:09:31AM +0200, Julia Lawall wrote:
>On Mon, 8 Jun 2015, Firo Yang wrote:
>
>> A Coccinelle warning.
>> It's not necessary to free memory allocated with devm_xxx
>> and using these free functions maybe lead to a double free that
>> will corrupt the resource subsys. So, I just remove them.
>>
>> By the way, I replace devm_request_mem_region and devm_ioremap with
>> devm_ioremap_resource as Julia's suggestion.
>
>I think they should be done separately.  The first patch fixes a bug.  The
>second one just simplifies/modernizes the code.

Ok, I will send another patch with simplified code separately.
But, what about this patch? Will it be discared?

>
>julia
>
>>
>> Signed-off-by: Firo Yang <[email-masked]>
>> ---
>>  arch/arm/plat-pxa/ssp.c | 24 +++---------------------
>>  1 file changed, 3 insertions(+), 21 deletions(-)
>>
>> diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c
>> index ad9529c..a278ea0 100644
>> --- a/arch/arm/plat-pxa/ssp.c
>> +++ b/arch/arm/plat-pxa/ssp.c
>> @@ -182,21 +182,12 @@ static int pxa_ssp_probe(struct platform_device *pdev)
>>  		return -ENODEV;
>>  	}
>>
>> -	res = devm_request_mem_region(dev, res->start, resource_size(res),
>> -				      pdev->name);
>> -	if (res == NULL) {
>> -		dev_err(dev, "failed to request memory resource\n");
>> -		return -EBUSY;
>> -	}
>> +	ssp->mmio_base = devm_ioremap_resource(dev, res);
>> +	if (IS_ERR(ssp->mmio_base))
>> +		return PTR_ERR(ssp->mmio_base);
>>
>>  	ssp->phys_base = res->start;
>>
>> -	ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
>> -	if (ssp->mmio_base == NULL) {
>> -		dev_err(dev, "failed to ioremap() registers\n");
>> -		return -ENODEV;
>> -	}
>> -
>>  	ssp->irq = platform_get_irq(pdev, 0);
>>  	if (ssp->irq < 0) {
>>  		dev_err(dev, "no IRQ resource defined\n");
>> @@ -232,25 +223,16 @@ static int pxa_ssp_probe(struct platform_device *pdev)
>>
>>  static int pxa_ssp_remove(struct platform_device *pdev)
>>  {
>> -	struct resource *res;
>>  	struct ssp_device *ssp;
>>
>>  	ssp = platform_get_drvdata(pdev);
>>  	if (ssp == NULL)
>>  		return -ENODEV;
>>
>> -	iounmap(ssp->mmio_base);
>> -
>> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	release_mem_region(res->start, resource_size(res));
>> -
>> -	clk_put(ssp->clk);
>> -
>>  	mutex_lock(&ssp_lock);
>>  	list_del(&ssp->node);
>>  	mutex_unlock(&ssp_lock);
>>
>> -	kfree(ssp);
>>  	return 0;
>>  }
>>
>> --
>> 2.4.2
>>
>> --
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