Hi Sean, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on mtd/mtd/next] [also build test ERROR on mtd/mtd/fixes mtd/nand/next v5.15-rc4 next-20211008] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Sean-Nyekjaer/mtd-core-protect-access-to-mtd-devices-while-in-suspend/20211008-224107 base: https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next config: x86_64-buildonly-randconfig-r005-20211008 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 8ed2e8e04ff42eb4d8009999ae1fd341a30bf6c0) 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 # https://github.com/0day-ci/linux/commit/d83ca808e3d10c716b9ba1bab5a34a6f20875041 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Nyekjaer/mtd-core-protect-access-to-mtd-devices-while-in-suspend/20211008-224107 git checkout d83ca808e3d10c716b9ba1bab5a34a6f20875041 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): >> drivers/mtd/nand/raw/nand_base.c:4347:2: error: variable 'ret' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized] default: ^~~~~~~ drivers/mtd/nand/raw/nand_base.c:4358:9: note: uninitialized use occurs here return ret; ^~~ drivers/mtd/nand/raw/nand_base.c:4335:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 error generated. vim +/ret +4347 drivers/mtd/nand/raw/nand_base.c 2af7c653993199 drivers/mtd/nand/nand_base.c Simon Kagstrom 2009-10-05 4324 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4325 /** 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4326 * nand_write_oob - [MTD Interface] NAND write data and/or out-of-band 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4327 * @mtd: MTD device structure 844d3b427ef1a4 drivers/mtd/nand/nand_base.c Randy Dunlap 2006-06-28 4328 * @to: offset to write to 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4329 * @ops: oob operation description structure 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4330 */ 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4331 static int nand_write_oob(struct mtd_info *mtd, loff_t to, 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4332 struct mtd_oob_ops *ops) 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4333 { 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4334 struct nand_chip *chip = mtd_to_nand(mtd); 80107e764846a6 drivers/mtd/nand/raw/nand_base.c Colin Ian King 2019-07-31 4335 int ret; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4336 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4337 ops->retlen = 0; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4338 d83ca808e3d10c drivers/mtd/nand/raw/nand_base.c Sean Nyekjaer 2021-10-08 4339 nand_get_device(chip); 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4340 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4341 switch (ops->mode) { 0612b9ddc2eeda drivers/mtd/nand/nand_base.c Brian Norris 2011-08-30 4342 case MTD_OPS_PLACE_OOB: 0612b9ddc2eeda drivers/mtd/nand/nand_base.c Brian Norris 2011-08-30 4343 case MTD_OPS_AUTO_OOB: 0612b9ddc2eeda drivers/mtd/nand/nand_base.c Brian Norris 2011-08-30 4344 case MTD_OPS_RAW: 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4345 break; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4346 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 @4347 default: 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4348 goto out; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4349 } 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4350 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4351 if (!ops->datbuf) 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4352 ret = nand_do_write_oob(chip, to, ops); 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4353 else 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4354 ret = nand_do_write_ops(chip, to, ops); 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4355 ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4356 out: 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4357 nand_release_device(chip); ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4358 return ret; ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4359 } ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4360 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org