Hi Can, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mkp-scsi/for-next] [also build test WARNING on next-20210524] [cannot apply to scsi/for-next v5.13-rc3] [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/Can-Guo/Optimize-host-lock-on-TR... base: https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next config: arm64-randconfig-r011-20210524 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 93d1e5822ed64abd777eb94ea9899e96c4c39fbe) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/efe94162bf7973be4ed6496871b9bc9ea... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Can-Guo/Optimize-host-lock-on-TR-send-compl-paths-and-utilize-UTRLCNR/20210524-163847 git checkout efe94162bf7973be4ed6496871b9bc9ea54e2819 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 >>): if (unlikely(test_bit(tag, &hba->outstanding_reqs))) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:78:22: note: expanded from macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/ufs/ufshcd.c:2981:32: note: uninitialized use occurs here (struct utp_upiu_req *)lrbp->ucd_rsp_ptr); ^~~~ drivers/scsi/ufs/ufshcd.c:2959:2: note: remove the 'if' if its condition is always false if (unlikely(test_bit(tag, &hba->outstanding_reqs))) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/scsi/ufs/ufshcd.c:2939:25: note: initialize the variable 'lrbp' to silence this warning struct ufshcd_lrb *lrbp; ^ = NULL 1 warning generated. vim +2959 drivers/scsi/ufs/ufshcd.c 2924 2925 /** 2926 * ufshcd_exec_dev_cmd - API for sending device management requests 2927 * @hba: UFS hba 2928 * @cmd_type: specifies the type (NOP, Query...) 2929 * @timeout: time in seconds 2930 * 2931 * NOTE: Since there is only one available tag for device management commands, 2932 * it is expected you hold the hba->dev_cmd.lock mutex. 2933 */ 2934 static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, 2935 enum dev_cmd_type cmd_type, int timeout) 2936 { 2937 struct request_queue *q = hba->cmd_queue; 2938 struct request *req; 2939 struct ufshcd_lrb *lrbp; 2940 int err; 2941 int tag; 2942 struct completion wait; 2943 2944 down_read(&hba->clk_scaling_lock); 2945 2946 /* 2947 * Get free slot, sleep if slots are unavailable. 2948 * Even though we use wait_event() which sleeps indefinitely, 2949 * the maximum wait time is bounded by SCSI request timeout. 2950 */ 2951 req = blk_get_request(q, REQ_OP_DRV_OUT, 0); 2952 if (IS_ERR(req)) { 2953 err = PTR_ERR(req); 2954 goto out_unlock; 2955 } 2956 tag = req->tag; 2957 WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag)); 2958 2960 err = -EBUSY; 2961 goto out; 2962 } 2963 2964 init_completion(&wait); 2965 lrbp = &hba->lrb[tag]; 2966 WARN_ON(lrbp->cmd); 2967 err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag); 2968 if (unlikely(err)) 2969 goto out_put_tag; 2970 2971 hba->dev_cmd.complete = &wait; 2972 2973 ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp->ucd_req_ptr); 2974 /* Make sure descriptors are ready before ringing the doorbell */ 2975 wmb(); 2976 2977 ufshcd_send_command(hba, tag); 2978 err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout); 2979 out: 2980 ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP, 2981 (struct utp_upiu_req *)lrbp->ucd_rsp_ptr); 2982 2983 out_put_tag: 2984 blk_put_request(req); 2985 out_unlock: 2986 up_read(&hba->clk_scaling_lock); 2987 return err; 2988 } 2989 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org