Hi Sean, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mtd/nand/next] [also build test WARNING on linux/master linus/master v5.16-rc6 next-20211220] [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-rawnand-protec... base: https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next config: mips-randconfig-r002-20211220 (https://download.01.org/0day-ci/archive/20211221/202112210255.fmm6tiKT-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 555eacf75f21cd1dfc6363d73ad187b730349543) 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 mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://github.com/0day-ci/linux/commit/4820bae9bf9bca82933f29066b18ea85f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Nyekjaer/mtd-rawnand-protect-access-to-rawnand-devices-while-in-suspend/20211220-210300 git checkout 4820bae9bf9bca82933f29066b18ea85f8c06178 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/mtd/nand/raw/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): default: ^~~~~~~ drivers/mtd/nand/raw/nand_base.c:4437:9: note: uninitialized use occurs here return ret; ^~~ drivers/mtd/nand/raw/nand_base.c:4414:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning generated. vim +/ret +4426 drivers/mtd/nand/raw/nand_base.c 2af7c653993199 drivers/mtd/nand/nand_base.c Simon Kagstrom 2009-10-05 4403 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4404 /** 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4405 * 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 4406 * @mtd: MTD device structure 844d3b427ef1a4 drivers/mtd/nand/nand_base.c Randy Dunlap 2006-06-28 4407 * @to: offset to write to 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4408 * @ops: oob operation description structure 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4409 */ 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4410 static int nand_write_oob(struct mtd_info *mtd, loff_t to, 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4411 struct mtd_oob_ops *ops) 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4412 { 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4413 struct nand_chip *chip = mtd_to_nand(mtd); 80107e764846a6 drivers/mtd/nand/raw/nand_base.c Colin Ian King 2019-07-31 4414 int ret; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4415 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4416 ops->retlen = 0; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4417 4820bae9bf9bca drivers/mtd/nand/raw/nand_base.c Sean Nyekjaer 2021-12-20 4418 nand_get_device(chip); 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4419 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4420 switch (ops->mode) { 0612b9ddc2eeda drivers/mtd/nand/nand_base.c Brian Norris 2011-08-30 4421 case MTD_OPS_PLACE_OOB: 0612b9ddc2eeda drivers/mtd/nand/nand_base.c Brian Norris 2011-08-30 4422 case MTD_OPS_AUTO_OOB: 0612b9ddc2eeda drivers/mtd/nand/nand_base.c Brian Norris 2011-08-30 4423 case MTD_OPS_RAW: 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4424 break; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4425 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 @4426 default: 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4427 goto out; 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4428 } 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4429 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4430 if (!ops->datbuf) 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4431 ret = nand_do_write_oob(chip, to, ops); 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4432 else 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4433 ret = nand_do_write_ops(chip, to, ops); 8593fbc68b0df1 drivers/mtd/nand/nand_base.c Thomas Gleixner 2006-05-29 4434 ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4435 out: 0813621ba898aa drivers/mtd/nand/raw/nand_base.c Boris Brezillon 2018-11-11 4436 nand_release_device(chip); ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4437 return ret; ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4438 } ^1da177e4c3f41 drivers/mtd/nand/nand_base.c Linus Torvalds 2005-04-16 4439 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org