linux-kernel - Re: [PATCH 8/9] i2c: imx-lpi2c: Use dev_err

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Date:   Mon, 7 Aug 2023 10:13:30 +0800
From:   "Liao, Chang" <liaochang1@...wei.com>
To:     Andi Shyti <andi.shyti@...nel.org>
CC:     <florian.fainelli@...adcom.com>,
        <bcm-kernel-feedback-list@...adcom.com>, <rjui@...adcom.com>,
        <sbranden@...adcom.com>, <yangyicong@...ilicon.com>,
        <aisheng.dong@....com>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>, <kernel@...gutronix.de>,
        <festevam@...il.com>, <linux-imx@....com>, <kblaiech@...dia.com>,
        <asmaa@...dia.com>, <loic.poulain@...aro.org>, <rfoss@...nel.org>,
        <ardb@...nel.org>, <gcherian@...vell.com>,
        <linux-i2c@...r.kernel.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 8/9] i2c: imx-lpi2c: Use dev_err_probe in probe function

Hi, Andi

在 2023/8/5 6:16, Andi Shyti 写道:
> On Wed, Aug 02, 2023 at 05:57:36PM +0800, Liao Chang wrote:
>> Use the dev_err_probe function instead of dev_err in the probe function
>> so that the printed messge includes the return value and also handles
>> -EPROBE_DEFER nicely.
>>
>> Signed-off-by: Liao Chang <liaochang1@...wei.com>
>> ---
>>  drivers/i2c/busses/i2c-imx-lpi2c.c | 12 ++++--------
>>  1 file changed, 4 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
>> index c3287c887c6f..bfa788b3775b 100644
>> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
>> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
>> @@ -569,10 +569,8 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
>>  		sizeof(lpi2c_imx->adapter.name));
>>  
>>  	ret = devm_clk_bulk_get_all(&pdev->dev, &lpi2c_imx->clks);
>> -	if (ret < 0) {
>> -		dev_err(&pdev->dev, "can't get I2C peripheral clock, ret=%d\n", ret);
>> -		return ret;
>> -	}
>> +	if (ret < 0)
>> +		return dev_err_probe(&pdev->dev, ret, "can't get I2C peripheral clock\n");
> 
> you cut on this because the line was going over 100 characters? :)
> 
> In theory you shouldn't change the print message when doing such
> changes and you can still split it as:
> 
> 		return dev_err_probe(&pdev->dev, ret,
> 				     "can't get I2C peripheral clock, ret=%d\n",
> 				     ret);
> 
> and you're even within the 80 characters.

Since dev_err_probe always print the second parameter that happens to be the return value,
I remove the "ret=%d" from the original message to avoid a redundant error message.

So is it better to keep the original message unchanged, even though dev_err_probe also prints
the return error value? Or is it better to make this change so that all error messages printed
in the probe function include the return value in a consistent style?

> 
> Sorry, I missed it in the previous version, mind resending it?

Sure, I will resend it in v3.

Thanks.

> 
> Andi

-- 
BR
Liao, Chang