linux-kernel - Re: [PATCH] hwmon: (amc6821) Fix unsigned expression compared with zero

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Message-ID: <a530b209-36bd-c2c3-8196-a9c5001f6333@infradead.org>
Date:   Thu, 3 Nov 2022 08:03:35 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     wangkailong@...i.cn, jdelvare@...e.com,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (amc6821) Fix unsigned expression compared with
 zero



On 11/3/22 07:17, Guenter Roeck wrote:
> On Wed, Nov 02, 2022 at 07:59:06PM -0700, Randy Dunlap wrote:
>>
>>
>> On 11/2/22 19:27, wangkailong@...i.cn wrote:
>>> Fix the following coccicheck warning:
>>>
>>> drivers/hwmon/amc6821.c:215: WARNING: Unsigned expression compared
>>> with zero: reg > 0
>>> drivers/hwmon/amc6821.c:228: WARNING: Unsigned expression compared
>>> with zero: reg > 0
>>>
>>> Signed-off-by: KaiLong Wang <wangkailong@...i.cn>
>>
>> Hm. IDGI. What's wrong with comparing an unsigned value to > 0?
>> I mean, it could be == 0 or > 0.
>> Please explain.
> 
> I don't get it either. The real problem with this driver is that error
> returns from i2c functions are not checked. However, that problem is not
> fixed by this patch. That means the patch would change behavior without
> fixing the actual problem.
> 
> I wonder what kind of (broken) compiler or analyzer produces above errors.
> We'll have to watch out for similar broken "fixes".

It says above that it's a coccicheck warning.

-- 
~Randy