linux-kernel - 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 03:32:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Marek Vasut <marex@...x.de>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>
Subject: drivers/net/ethernet/micrel/ks8851_common.c:995:6: warning: variable
 'ret' set but not used

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.


vim +/ret +995 drivers/net/ethernet/micrel/ks8851_common.c

3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   985  
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   986  /**
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   987   * ks8851_read_selftest - read the selftest memory info.
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   988   * @ks: The device state
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   989   *
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   990   * Read and check the TX/RX memory selftest information.
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   991   */
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   992  static int ks8851_read_selftest(struct ks8851_net *ks)
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   993  {
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   994  	unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  @995  	int ret = 0;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   996  	unsigned rd;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   997  
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   998  	rd = ks8851_rdreg16(ks, KS_MBIR);
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16   999  
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1000  	if ((rd & both_done) != both_done) {
0dc7d2b3cbfcf4 drivers/net/ks8851.c Joe Perches 2010-02-27  1001  		netdev_warn(ks->netdev, "Memory selftest not finished\n");
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1002  		return 0;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1003  	}
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1004  
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1005  	if (rd & MBIR_TXMBFA) {
0dc7d2b3cbfcf4 drivers/net/ks8851.c Joe Perches 2010-02-27  1006  		netdev_err(ks->netdev, "TX memory selftest fail\n");
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1007  		ret |= 1;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1008  	}
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1009  
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1010  	if (rd & MBIR_RXMBFA) {
0dc7d2b3cbfcf4 drivers/net/ks8851.c Joe Perches 2010-02-27  1011  		netdev_err(ks->netdev, "RX memory selftest fail\n");
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1012  		ret |= 2;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1013  	}
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1014  
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1015  	return 0;
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1016  }
3ba81f3ece3cfa drivers/net/ks8851.c Ben Dooks   2009-07-16  1017  

:::::: The code at line 995 was first introduced by commit
:::::: 3ba81f3ece3cfa4ffb06d21ac93b8cad7fbe6a73 net: Micrel KS8851 SPI network driver

:::::: TO: Ben Dooks <ben@...tec.co.uk>
:::::: CC: David S. Miller <davem@...emloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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