linux-kernel - Re: [PATCH -next v2] dmaengine: ste_dma40: fix error return code in d40

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Date:	Fri, 31 May 2013 09:07:36 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	andy.shevchenko@...il.com
Cc:	srinidhi.kasagar@...ricsson.com, linus.walleij@...aro.org,
	vinod.koul@...el.com, djbw@...com, grant.likely@...aro.org,
	rob.herring@...xeda.com, yongjun_wei@...ndmicro.com.cn,
	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v2] dmaengine: ste_dma40: fix error return code in d40_probe()

On 05/31/2013 02:29 AM, Andy Shevchenko wrote:
> On Thu, May 30, 2013 at 7:32 AM, Wei Yongjun <weiyj.lk@...il.com> wrote:
>> In many of the error handling case, the return value 'ret' not set
>> and 0 will be return from d40_probe() even if error, but we should
>> return a negative error code instead in those error handling case.
>> This patch fixed them, and also removed useless variable 'err'.
> Hold on, please.
>
>> --- a/drivers/dma/ste_dma40.c
>> +++ b/drivers/dma/ste_dma40.c
>> @@ -3619,6 +3618,7 @@ static int __init d40_probe(struct platform_device *pdev)
>>                 if (IS_ERR(base->lcpa_regulator)) {
>>                         d40_err(&pdev->dev, "Failed to get lcpa_regulator\n");
>>                         base->lcpa_regulator = NULL;
>> +                       ret = PTR_ERR(base->lcpa_regulator);
> Is it really what we want?
>
> I thixh you may remove that NULL assignment.

Ohh, I will move the ret = PTR_ERR(base->lcpa_regulator) above the NULL
assignment, the failure path test for base->lcpa_regulator to release regulator.

        if (base->lcpa_regulator) {
            regulator_disable(base->lcpa_regulator);
            regulator_put(base->lcpa_regulator);
        }

>
>
>>                         goto failure;
>>                 }
>>
>> @@ -3647,8 +3647,8 @@ static int __init d40_probe(struct platform_device *pdev)
>>         d40_hw_init(base);
>>
>>         if (np) {
>> -               err = of_dma_controller_register(np, d40_xlate, NULL);
>> -               if (err && err != -ENODEV)
>> +               ret = of_dma_controller_register(np, d40_xlate, NULL);
>> +               if (ret && ret != -ENODEV)
> >From the discussion of dw_dmac I remember we decide that ENODEV check
> is redundant.

Get it, I will remove the ENODEV check.

Thanks,
Yongjun Wei

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