linux-kernel - Re: [PATCH -next v2 2/4] soc: ti: knav_dma: Use dev_err

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Message-ID: <8a02ecd3-4e3d-4332-85da-8a0bdf4b9ed2@kernel.org>
Date: Sat, 31 Aug 2024 07:21:52 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jinjie Ruan <ruanjinjie@...wei.com>, Nishanth Menon <nm@...com>
Cc: ssantosh@...nel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, jic23@...nel.org
Subject: Re: [PATCH -next v2 2/4] soc: ti: knav_dma: Use dev_err_probe() to
 simplfy code

On 31/08/2024 03:59, Jinjie Ruan wrote:
> 
> 
> On 2024/8/30 18:31, Nishanth Menon wrote:
>> On 14:32-20240830, Jinjie Ruan wrote:
>>> Use the dev_err_probe() helper to simplify error handling
>>> during probe.
>>>
>>> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
>>> ---
>>> v2:
>>> - Split into 2 patches.
>>> ---
>>>  drivers/soc/ti/knav_dma.c | 12 ++++--------
>>>  1 file changed, 4 insertions(+), 8 deletions(-)
>>>
>>> diff --git a/drivers/soc/ti/knav_dma.c b/drivers/soc/ti/knav_dma.c
>>> index 15e41d3a5e22..eeec422a46f0 100644
>>> --- a/drivers/soc/ti/knav_dma.c
>>> +++ b/drivers/soc/ti/knav_dma.c
>>> @@ -708,17 +708,13 @@ static int knav_dma_probe(struct platform_device *pdev)
>>>  	struct device_node *node = pdev->dev.of_node;
>>>  	int ret = 0;
>>>  
>>> -	if (!node) {
>>> -		dev_err(&pdev->dev, "could not find device info\n");
>>> -		return -EINVAL;
>>> -	}
>>> +	if (!node)
>>> +		return dev_err_probe(&pdev->dev, -EINVAL, "could not find device info\n");
>>>  
>>>  	kdev = devm_kzalloc(dev,
>>>  			sizeof(struct knav_dma_pool_device), GFP_KERNEL);
>>> -	if (!kdev) {
>>> -		dev_err(dev, "could not allocate driver mem\n");
>>> -		return -ENOMEM;
>>> -	}
>>> +	if (!kdev)
>>> +		return dev_err_probe(dev, -ENOMEM, "could not allocate driver mem\n");
>>
>> These make no sense to me :( -> just using dev_err_probe when there is
>> no chance of -EPROBE_DEFER ?
> 
> I noticed a change in dev_err_probe() this year, which is described in
> this patch:
> 
> For an out-of-memory error there should be no additional output. Adapt
> dev_err_probe() to not emit the error message when err is -ENOMEM.
> This simplifies handling errors that might among others be -ENOMEM.
> 
> 
> And the comment of dev_err_probe() said below:
> 
> * Using this helper in your probe function is totally fine even if @err

Fine but not much useful and at the same time huge churn from @vivo.com.

Best regards,
Krzysztof