linux-kernel - Re: [PATCH v1 1/2] hwmon: introduce hwmon_sanitize

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Date:   Mon, 28 Mar 2022 09:42:17 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Tom Rix <trix@...hat.com>, Michael Walle <michael@...le.cc>,
        Xu Yilun <yilun.xu@...el.com>,
        Jean Delvare <jdelvare@...e.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v1 1/2] hwmon: introduce hwmon_sanitize_name()

On 3/28/22 05:25, Tom Rix wrote:
> 
> On 3/28/22 4:52 AM, Michael Walle wrote:
>> More and more drivers will check for bad characters in the hwmon name
>> and all are using the same code snippet. Consolidate that code by adding
>> a new hwmon_sanitize_name() function.
>>
>> Signed-off-by: Michael Walle <michael@...le.cc>
>> ---
>>   drivers/hwmon/intel-m10-bmc-hwmon.c |  5 +----
>>   include/linux/hwmon.h               | 16 ++++++++++++++++
>>   2 files changed, 17 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/hwmon/intel-m10-bmc-hwmon.c b/drivers/hwmon/intel-m10-bmc-hwmon.c
>> index 7a08e4c44a4b..e6e55fc30153 100644
>> --- a/drivers/hwmon/intel-m10-bmc-hwmon.c
>> +++ b/drivers/hwmon/intel-m10-bmc-hwmon.c
>> @@ -515,7 +515,6 @@ static int m10bmc_hwmon_probe(struct platform_device *pdev)
>>       struct intel_m10bmc *m10bmc = dev_get_drvdata(pdev->dev.parent);
>>       struct device *hwmon_dev, *dev = &pdev->dev;
>>       struct m10bmc_hwmon *hw;
>> -    int i;
>>       hw = devm_kzalloc(dev, sizeof(*hw), GFP_KERNEL);
>>       if (!hw)
>> @@ -532,9 +531,7 @@ static int m10bmc_hwmon_probe(struct platform_device *pdev)
>>       if (!hw->hw_name)
>>           return -ENOMEM;
>> -    for (i = 0; hw->hw_name[i]; i++)
>> -        if (hwmon_is_bad_char(hw->hw_name[i]))
>> -            hw->hw_name[i] = '_';
>> +    hwmon_sanitize_name(hw->hw_name);
>>       hwmon_dev = devm_hwmon_device_register_with_info(dev, hw->hw_name,
>>                                hw, &hw->chip, NULL);
>> diff --git a/include/linux/hwmon.h b/include/linux/hwmon.h
>> index eba380b76d15..210b8c0b2827 100644
>> --- a/include/linux/hwmon.h
>> +++ b/include/linux/hwmon.h
>> @@ -484,4 +484,20 @@ static inline bool hwmon_is_bad_char(const char ch)
>>       }
>>   }
> 
> hwmon_is_bad_char is now only used by hwmon_sanitize_name.
> 
> as patch 3, consolidate into only hwmon_sanitize_name.
> 

That would make the code look messy.

The function isn't execution-time critical, and neither is hwmon_sanitize_name().
I would suggest to implement hwmon_sanitize_name() in the hwmon core.
The existing static inline can then be removed from the include file
after all callers have been converted.

Thanks,
Guenter