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dkim=pass header.d=intel.com header.s=Intel header.b=irLGLgFp; spf=none (imf10.hostedemail.com: domain of yujie.liu@intel.com has no SPF policy when checking 192.55.52.136) smtp.mailfrom=yujie.liu@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Rspam-User: X-Stat-Signature: f71apf7ogwenfg676k8uzb9whhhdk6ka X-HE-Tag: 1652066752-527761 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 38a288f5941ef03752887ad86f2d85442358c99a commit: 86116c2f6fee81a0be72a71cc2f1f7c087df8efa [9659/9759] nvme: wire-up uring-cmd support for io-passthru on char-device. config: i386-randconfig-c001 (https://download.01.org/0day-ci/archive/20220508/202205081711.ssgxsL9Z-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5e004fb787698440a387750db7f8028e7cb14cfc) 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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=86116c2f6fee81a0be72a71cc2f1f7c087df8efa git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 86116c2f6fee81a0be72a71cc2f1f7c087df8efa # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot clang-analyzer warnings: (new ones prefixed by >>) >> drivers/nvme/host/ioctl.c:693:2: warning: Undefined or garbage value returned to caller [clang-analyzer-core.uninitialized.UndefReturn] return ret; ^ ~~~ drivers/nvme/host/ioctl.c:688:2: note: 'ret' declared without an initial value int ret; ^~~~~~~ drivers/nvme/host/ioctl.c:690:2: note: Assuming 'ns' is null if (ns) ^ drivers/nvme/host/ioctl.c:690:2: note: Taking false branch if (ns) ^ drivers/nvme/host/ioctl.c:693:2: note: Undefined or garbage value returned to caller return ret; ^ ~~~ vim +693 drivers/nvme/host/ioctl.c 86116c2f6fee81 Kanchan Joshi 2022-05-05 680 86116c2f6fee81 Kanchan Joshi 2022-05-05 681 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, 86116c2f6fee81 Kanchan Joshi 2022-05-05 682 unsigned int issue_flags) 86116c2f6fee81 Kanchan Joshi 2022-05-05 683 { 86116c2f6fee81 Kanchan Joshi 2022-05-05 684 struct cdev *cdev = file_inode(ioucmd->file)->i_cdev; 86116c2f6fee81 Kanchan Joshi 2022-05-05 685 struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev); 86116c2f6fee81 Kanchan Joshi 2022-05-05 686 int srcu_idx = srcu_read_lock(&head->srcu); 86116c2f6fee81 Kanchan Joshi 2022-05-05 687 struct nvme_ns *ns = nvme_find_path(head); 86116c2f6fee81 Kanchan Joshi 2022-05-05 688 int ret; 86116c2f6fee81 Kanchan Joshi 2022-05-05 689 86116c2f6fee81 Kanchan Joshi 2022-05-05 690 if (ns) 86116c2f6fee81 Kanchan Joshi 2022-05-05 691 ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 86116c2f6fee81 Kanchan Joshi 2022-05-05 692 srcu_read_unlock(&head->srcu, srcu_idx); 86116c2f6fee81 Kanchan Joshi 2022-05-05 @693 return ret; 86116c2f6fee81 Kanchan Joshi 2022-05-05 694 } 2405252a680e21 Christoph Hellwig 2021-04-10 695 #endif /* CONFIG_NVME_MULTIPATH */ 2405252a680e21 Christoph Hellwig 2021-04-10 696 -- 0-DAY CI Kernel Test Service https://01.org/lkp