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

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Message-ID: <1757c33c-a407-4a23-806d-658d9abe051f@kernel.org>
Date: Fri, 30 Aug 2024 12:36:43 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Nishanth Menon <nm@...com>, Jinjie Ruan <ruanjinjie@...wei.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 30/08/2024 12:31, 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 ?

Well, this does not make sense from other point of view - memory
allocation errors should have any printks...

This patchset - like several others from Jinjie - is some sort of
automation without careful consideration and without thinking whether
code makes sense.

Therefore I suggest to review it thoroughly and do not trust the
"innocent" look of such changes.

Best regards,
Krzysztof