netdev - Re: [PATCH v1] ieee802154: at86rf230: Simplify with dev_err

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Message-ID: <c87f7ab7-2c8c-4c08-b686-12c56fe3edeb@kernel.org>
Date: Fri, 30 Aug 2024 19:43:30 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Simon Horman <horms@...nel.org>, Shen Lichuan <shenlichuan@...o.com>
Cc: alex.aring@...il.com, stefan@...enfreihafen.org,
 miquel.raynal@...tlin.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, linux-wpan@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 opensource.kernel@...o.com
Subject: Re: [PATCH v1] ieee802154: at86rf230: Simplify with dev_err_probe()

On 30/08/2024 18:02, Simon Horman wrote:
> On Fri, Aug 30, 2024 at 04:14:02PM +0800, Shen Lichuan wrote:
>> Use dev_err_probe() to simplify the error path and unify a message
>> template.
>>
>> Using this helper is totally fine even if err is known to never
>> be -EPROBE_DEFER.
>>
>> The benefit compared to a normal dev_err() is the standardized format
>> of the error code, it being emitted symbolically and the fact that
>> the error code is returned which allows more compact error paths.
>>
>> Signed-off-by: Shen Lichuan <shenlichuan@...o.com>
> 
> ...
> 
>> @@ -1576,9 +1574,8 @@ static int at86rf230_probe(struct spi_device *spi)
>>  
>>  	lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
>>  	if (IS_ERR(lp->regmap)) {
>> -		rc = PTR_ERR(lp->regmap);
>> -		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
>> -			rc);
>> +		dev_err_probe(&spi->dev, PTR_ERR(lp->regmap),
>> +			      "Failed to allocate register map\n");
>>  		goto free_dev;
> 
> After branching to dev_free the function will return rc.
> So I think it still needs to be set a in this error path.

Another bug introduced by @vivo.com.

Since ~2 weeks there is tremendous amount of trivial patches coming from
vivo.com. I identified at least 5 buggy, where the contributor did not
understand the code.

All these "trivial" improvements should be really double-checked.

Best regards,
Krzysztof