Re: [PATCH v4 4/7] ufs: mcq: Add support for clean up mcq resources

[kernel test robot <lkp@intel.com>]

Hi Bao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on jejb-scsi/for-next]
[also build test WARNING on mkp-scsi/for-next linus/master v6.4-rc1 next-20230511]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Bao-D-Nguyen/ufs-core-Combine-32-bit-command_desc_base_addr_lo-hi/20230512-060009
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next
patch link:    https://lore.kernel.org/r/33fe3d5bd6223d0ca1b5002efb7efc7bb90f3495.1683841772.git.quic_nguyenb%40quicinc.com
patch subject: [PATCH v4 4/7] ufs: mcq: Add support for clean up mcq resources
config: x86_64-randconfig-a014 (https://download.01.org/0day-ci/archive/20230512/202305121245.uSA6swAd-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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/intel-lab-lkp/linux/commit/e05a8eb3fd257b04965c2333d4bf0161177ef504
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Bao-D-Nguyen/ufs-core-Combine-32-bit-command_desc_base_addr_lo-hi/20230512-060009
        git checkout e05a8eb3fd257b04965c2333d4bf0161177ef504
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305121245.uSA6swAd-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/ufs/core/ufshcd.c:7526:32: warning: variable 'reg' is uninitialized when used here [-Wuninitialized]
           if (!is_mcq_enabled(hba) && !(reg & (1 << tag))) {
                                         ^~~
   drivers/ufs/core/ufshcd.c:7489:9: note: initialize the variable 'reg' to silence this warning
           u32 reg;
                  ^
                   = 0
   1 warning generated.


vim +/reg +7526 drivers/ufs/core/ufshcd.c

  7473	
  7474	/**
  7475	 * ufshcd_abort - scsi host template eh_abort_handler callback
  7476	 * @cmd: SCSI command pointer
  7477	 *
  7478	 * Returns SUCCESS/FAILED
  7479	 */
  7480	static int ufshcd_abort(struct scsi_cmnd *cmd)
  7481	{
  7482		struct Scsi_Host *host = cmd->device->host;
  7483		struct ufs_hba *hba = shost_priv(host);
  7484		int tag = scsi_cmd_to_rq(cmd)->tag;
  7485		struct ufshcd_lrb *lrbp = &hba->lrb[tag];
  7486		unsigned long flags;
  7487		int err = FAILED;
  7488		bool outstanding;
  7489		u32 reg;
  7490	
  7491		WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);
  7492	
  7493		ufshcd_hold(hba, false);
  7494	
  7495		if (!is_mcq_enabled(hba) && !test_bit(tag, &hba->outstanding_reqs)) {
  7496			reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
  7497			/* If command is already aborted/completed, return FAILED. */
  7498			dev_err(hba->dev,
  7499				"%s: cmd at tag %d already completed, outstanding=0x%lx, doorbell=0x%x\n",
  7500				__func__, tag, hba->outstanding_reqs, reg);
  7501			goto release;
  7502		}
  7503	
  7504		/* Print Transfer Request of aborted task */
  7505		dev_info(hba->dev, "%s: Device abort task at tag %d\n", __func__, tag);
  7506	
  7507		/*
  7508		 * Print detailed info about aborted request.
  7509		 * As more than one request might get aborted at the same time,
  7510		 * print full information only for the first aborted request in order
  7511		 * to reduce repeated printouts. For other aborted requests only print
  7512		 * basic details.
  7513		 */
  7514		scsi_print_command(cmd);
  7515		if (!hba->req_abort_count) {
  7516			ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, tag);
  7517			ufshcd_print_evt_hist(hba);
  7518			ufshcd_print_host_state(hba);
  7519			ufshcd_print_pwr_info(hba);
  7520			ufshcd_print_tr(hba, tag, true);
  7521		} else {
  7522			ufshcd_print_tr(hba, tag, false);
  7523		}
  7524		hba->req_abort_count++;
  7525	
> 7526		if (!is_mcq_enabled(hba) && !(reg & (1 << tag))) {
  7527			/* only execute this code in single doorbell mode */
  7528			dev_err(hba->dev,
  7529			"%s: cmd was completed, but without a notifying intr, tag = %d",
  7530			__func__, tag);
  7531			__ufshcd_transfer_req_compl(hba, 1UL << tag);
  7532			goto release;
  7533		}
  7534	
  7535		/*
  7536		 * Task abort to the device W-LUN is illegal. When this command
  7537		 * will fail, due to spec violation, scsi err handling next step
  7538		 * will be to send LU reset which, again, is a spec violation.
  7539		 * To avoid these unnecessary/illegal steps, first we clean up
  7540		 * the lrb taken by this cmd and re-set it in outstanding_reqs,
  7541		 * then queue the eh_work and bail.
  7542		 */
  7543		if (lrbp->lun == UFS_UPIU_UFS_DEVICE_WLUN) {
  7544			ufshcd_update_evt_hist(hba, UFS_EVT_ABORT, lrbp->lun);
  7545	
  7546			spin_lock_irqsave(host->host_lock, flags);
  7547			hba->force_reset = true;
  7548			ufshcd_schedule_eh_work(hba);
  7549			spin_unlock_irqrestore(host->host_lock, flags);
  7550			goto release;
  7551		}
  7552	
  7553		/* Skip task abort in case previous aborts failed and report failure */
  7554		if (lrbp->req_abort_skip) {
  7555			dev_err(hba->dev, "%s: skipping abort\n", __func__);
  7556			ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
  7557			goto release;
  7558		}
  7559	
  7560		err = ufshcd_try_to_abort_task(hba, tag);
  7561		if (err) {
  7562			dev_err(hba->dev, "%s: failed with err %d\n", __func__, err);
  7563			ufshcd_set_req_abort_skip(hba, hba->outstanding_reqs);
  7564			err = FAILED;
  7565			goto release;
  7566		}
  7567	
  7568		/*
  7569		 * Clear the corresponding bit from outstanding_reqs since the command
  7570		 * has been aborted successfully.
  7571		 */
  7572		spin_lock_irqsave(&hba->outstanding_lock, flags);
  7573		outstanding = __test_and_clear_bit(tag, &hba->outstanding_reqs);
  7574		spin_unlock_irqrestore(&hba->outstanding_lock, flags);
  7575	
  7576		if (outstanding)
  7577			ufshcd_release_scsi_cmd(hba, lrbp);
  7578	
  7579		err = SUCCESS;
  7580	
  7581	release:
  7582		/* Matches the ufshcd_hold() call at the start of this function. */
  7583		ufshcd_release(hba);
  7584		return err;
  7585	}
  7586	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests