linux-kernel - Re: drivers/net/ethernet/micrel/ks8851_common.c:995:6: warning: variable 'ret' set but not used

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Date:   Thu, 3 Jun 2021 01:29:18 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     kernel test robot <lkp@...el.com>, Marek Vasut <marex@...x.de>,
        kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: drivers/net/ethernet/micrel/ks8851_common.c:995:6: warning:
 variable 'ret' set but not used

On Wed, Jun 02, 2021 at 01:02:43PM -0700, Nathan Chancellor wrote:
> On 6/2/2021 12:32 PM, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   231bc539066760aaa44d46818c85b14ca2f56d9f
> > commit: 797047f875b5463719cc70ba213eb691d453c946 net: ks8851: Implement Parallel bus operations
> > date:   1 year ago
> > config: x86_64-randconfig-a004-20210601 (attached as .config)
> > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d41cb6bb2607fa5c7a9df2b3dab361353657d225)
> > reproduce (this is a W=1 build):
> >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >          chmod +x ~/bin/make.cross
> >          # install x86_64 cross compiling tool for clang build
> >          # apt-get install binutils-x86-64-linux-gnu
> >          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=797047f875b5463719cc70ba213eb691d453c946
> >          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >          git fetch --no-tags linus master
> >          git checkout 797047f875b5463719cc70ba213eb691d453c946
> >          # save the attached .config to linux build tree
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All warnings (new ones prefixed by >>):
> > 
> > > > drivers/net/ethernet/micrel/ks8851_common.c:995:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
> >             int ret = 0;
> >                 ^
> >     1 warning generated.
> 
> This warning is newly implemented in clang, it was not caused by the above
> commit. As you can see from the blame below, this has been an issue since
> this driver's introduction. I wonder if it was intended to return ret in the
> places that return 0?

The return value from s8851_read_selftest() is ignored by the
caller. Probably ret could be removed and the function made to return
void.

	Andrew