tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 52e44129fba5cfc4e351fdb5e45849afc74d9a53 commit: 556bbb442bbb44f429dbaa9f8b48e0b4cda6e088 bus: mhi: core: Separate system error and power down handling date: 5 months ago config: powerpc-randconfig-r024-20210411 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dd453a1389b6a7e6d9214b449d3c54981b1a89b6) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 556bbb442bbb44f429dbaa9f8b48e0b4cda6e088 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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 >>): void mhi_pm_st_worker(struct work_struct *work) ^ 1 warning generated. vim +/mhi_pm_st_worker +740 drivers/bus/mhi/core/pm.c a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 738 a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 739 /* Device State Transition worker */ a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 @740 void mhi_pm_st_worker(struct work_struct *work) a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 741 { a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 742 struct state_transition *itr, *tmp; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 743 LIST_HEAD(head); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 744 struct mhi_controller *mhi_cntrl = container_of(work, a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 745 struct mhi_controller, a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 746 st_worker); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 747 struct device *dev = &mhi_cntrl->mhi_dev->dev; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 748 a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 749 spin_lock_irq(&mhi_cntrl->transition_lock); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 750 list_splice_tail_init(&mhi_cntrl->transition_list, &head); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 751 spin_unlock_irq(&mhi_cntrl->transition_lock); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 752 a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 753 list_for_each_entry_safe(itr, tmp, &head, node) { a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 754 list_del(&itr->node); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 755 dev_dbg(dev, "Handling state transition: %s\n", a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 756 TO_DEV_STATE_TRANS_STR(itr->state)); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 757 a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 758 switch (itr->state) { a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 759 case DEV_ST_TRANSITION_PBL: a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 760 write_lock_irq(&mhi_cntrl->pm_lock); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 761 if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 762 mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 763 write_unlock_irq(&mhi_cntrl->pm_lock); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 764 if (MHI_IN_PBL(mhi_cntrl->ee)) 560e3a045961ed Bhaumik Bhatt 2020-05-21 765 mhi_fw_load_handler(mhi_cntrl); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 766 break; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 767 case DEV_ST_TRANSITION_SBL: a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 768 write_lock_irq(&mhi_cntrl->pm_lock); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 769 mhi_cntrl->ee = MHI_EE_SBL; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 770 write_unlock_irq(&mhi_cntrl->pm_lock); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 771 /* a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 772 * The MHI devices are only created when the client a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 773 * device switches its Execution Environment (EE) to a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 774 * either SBL or AMSS states a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 775 */ a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 776 mhi_create_devices(mhi_cntrl); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 777 break; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 778 case DEV_ST_TRANSITION_MISSION_MODE: a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 779 mhi_pm_mission_mode_transition(mhi_cntrl); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 780 break; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 781 case DEV_ST_TRANSITION_READY: a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 782 mhi_ready_state_transition(mhi_cntrl); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 783 break; bc7ccce5a5192c Hemant Kumar 2020-05-21 784 case DEV_ST_TRANSITION_SYS_ERR: 556bbb442bbb44 Bhaumik Bhatt 2020-11-09 785 mhi_pm_sys_error_transition(mhi_cntrl); bc7ccce5a5192c Hemant Kumar 2020-05-21 786 break; 3c1bd0047124f5 Hemant Kumar 2020-05-21 787 case DEV_ST_TRANSITION_DISABLE: 3c1bd0047124f5 Hemant Kumar 2020-05-21 788 mhi_pm_disable_transition 3c1bd0047124f5 Hemant Kumar 2020-05-21 789 (mhi_cntrl, MHI_PM_SHUTDOWN_PROCESS); 3c1bd0047124f5 Hemant Kumar 2020-05-21 790 break; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 791 default: a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 792 break; a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 793 } a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 794 kfree(itr); a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 795 } a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 796 } a6e2e3522f2914 Manivannan Sadhasivam 2020-02-20 797 :::::: The code at line 740 was first introduced by commit :::::: a6e2e3522f29141b95c1ef8580c665a3582b3e66 bus: mhi: core: Add support for PM state transitions :::::: TO: Manivannan Sadhasivam <manivannan.sadhasivam(a)linaro.org&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org