linux-kernel - Re: [PATCH -next] driver core: switch to use dev_err

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Date:   Mon, 22 Aug 2022 10:10:22 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <rafael@...nel.org>
Subject: Re: [PATCH -next] driver core: switch to use dev_err_probe()

Hi,

On 2022/8/19 17:42, Greg KH wrote:
> On Fri, Aug 19, 2022 at 05:46:56PM +0800, Yang Yingliang wrote:
>> Use dev_err_probe() to simplify code and print error code.
>>
>> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
>> ---
>>   drivers/base/core.c | 8 +++-----
>>   1 file changed, 3 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/base/core.c b/drivers/base/core.c
>> index 753e7cca0f40..e51a09f9d0ec 100644
>> --- a/drivers/base/core.c
>> +++ b/drivers/base/core.c
>> @@ -2507,11 +2507,9 @@ static ssize_t uevent_store(struct device *dev, struct device_attribute *attr,
>>   	int rc;
>>   
>>   	rc = kobject_synth_uevent(&dev->kobj, buf, count);
>> -
>> -	if (rc) {
>> -		dev_err(dev, "uevent: failed to send synthetic uevent\n");
>> -		return rc;
>> -	}
>> +	if (rc)
>> +		return dev_err_probe(dev, rc,
>> +				     "uevent: failed to send synthetic uevent\n");
> I do not understand this at all, this is not on the probe path at all,
> so why is this function needed?
>
> Have you tested this?  What was the resulting output before and after
> this change?
Yes, after this change, the error code will be print.
>
> thanks,
>
> greg k-h
> .