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

From: kernel test robot
Date: Wed Jun 02 2021 - 15:33:57 EST

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@xxxxxxxxx>

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@xxxxxxxxxxxx>
:::::: CC: David S. Miller <davem@xxxxxxxxxxxxx>

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

Attachment: .config.gz
Description: application/gzip