linux-kernel - Re: [PATCH net-next 2/4] net: phy: dp83869: Set opmode from straps

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Date:   Tue, 19 May 2020 12:40:37 -0500
From:   Dan Murphy <dmurphy@...com>
To:     kbuild test robot <lkp@...el.com>, <andrew@...n.ch>,
        <f.fainelli@...il.com>, <hkallweit1@...il.com>,
        <davem@...emloft.net>
CC:     <kbuild-all@...ts.01.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next 2/4] net: phy: dp83869: Set opmode from straps

kbuild

On 5/19/20 12:19 PM, kbuild test robot wrote:
> Hi Dan,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on net-next/master]
> [also build test WARNING on robh/for-next sparc-next/master net/master linus/master v5.7-rc6 next-20200518]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url:    https://github.com/0day-ci/linux/commits/Dan-Murphy/DP83869-Enhancements/20200519-222047
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 5cdfe8306631b2224e3f81fc5a1e2721c7a1948b
> config: sh-allmodconfig (attached as .config)
> compiler: sh4-linux-gcc (GCC) 9.3.0
> reproduce:
>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>          chmod +x ~/bin/make.cross
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sh
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
> drivers/net/phy/dp83869.c: In function 'dp83869_set_strapped_mode':
>>> drivers/net/phy/dp83869.c:171:10: warning: comparison is always false due to limited range of data type [-Wtype-limits]
> 171 |  if (val < 0)

This looks to be a false positive.

phy_read_mmd will return an errno or a value from 0->15

So if errno is returned then this will be true.

Unless I have to do IS_ERR.

Dan