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Date:   Thu, 11 May 2023 14:02:27 +0300
From:   Dan Carpenter <dan.carpenter@linaro.org>
To:     oe-kbuild@lists.linux.dev, Wenchao Hao <haowenchao2@huawei.com>,
        "James E . J . Bottomley" <jejb@linux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Douglas Gilbert <dgilbert@interlog.com>,
        linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     lkp@intel.com, oe-kbuild-all@lists.linux.dev,
        linfeilong@huawei.com, louhongxiang@huawei.com,
        Wenchao Hao <haowenchao2@huawei.com>
Subject: Re: [PATCH v2 6/6] scsi:scsi_debug: set command's result and sense
 data if the error is injected
Message-ID: <ea5ec1a0-7f4c-426a-86a0-03ce2a6233ed@kili.mountain>
MIME-Version: 1.0
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In-Reply-To: <20230428013320.347050-7-haowenchao2@huawei.com>
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Hi Wenchao,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Wenchao-Hao/scsi-scsi_debug-create-scsi_debug-directory-in-the-debugfs-filesystem/20230427-201534
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next
patch link:    https://lore.kernel.org/r/20230428013320.347050-7-haowenchao2%40huawei.com
patch subject: [PATCH v2 6/6] scsi:scsi_debug: set command's result and sense data if the error is injected
config: mips-randconfig-m041-20230509 (https://download.01.org/0day-ci/archive/20230511/202305111419.HegopAw8-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 12.1.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Link: https://lore.kernel.org/r/202305111419.HegopAw8-lkp@intel.com/

New smatch warnings:
drivers/scsi/scsi_debug.c:7880 scsi_debug_queuecommand() warn: missing error code? 'ret'

Old smatch warnings:
drivers/scsi/scsi_debug.c:5389 scsi_debug_slave_destroy() warn: variable dereferenced before check 'devip' (see line 5388)

vim +/ret +7880 drivers/scsi/scsi_debug.c

70abb3e2434633 Wenchao Hao     2023-04-28  7861  	if (sdebug_timeout_cmd(scp)) {
70abb3e2434633 Wenchao Hao     2023-04-28  7862  		scmd_printk(KERN_INFO, scp, "timeout command 0x%x\n", opcode);
70abb3e2434633 Wenchao Hao     2023-04-28  7863  		return 0;
70abb3e2434633 Wenchao Hao     2023-04-28  7864  	}
70abb3e2434633 Wenchao Hao     2023-04-28  7865  
b3f5d28c11bee2 Wenchao Hao     2023-04-28  7866  	ret = sdebug_fail_queue_cmd(scp);
b3f5d28c11bee2 Wenchao Hao     2023-04-28  7867  	if (ret) {
                                                            ^^^

b3f5d28c11bee2 Wenchao Hao     2023-04-28  7868  		scmd_printk(KERN_INFO, scp, "fail queue command 0x%x with 0x%x\n",
b3f5d28c11bee2 Wenchao Hao     2023-04-28  7869  				opcode, ret);
b3f5d28c11bee2 Wenchao Hao     2023-04-28  7870  		return ret;
b3f5d28c11bee2 Wenchao Hao     2023-04-28  7871  	}
b3f5d28c11bee2 Wenchao Hao     2023-04-28  7872  
ef1cd466d439a1 Wenchao Hao     2023-04-28  7873  	if (sdebug_fail_cmd(scp, &ret, &err)) {
ef1cd466d439a1 Wenchao Hao     2023-04-28  7874  		scmd_printk(KERN_INFO, scp,
ef1cd466d439a1 Wenchao Hao     2023-04-28  7875  			"fail command 0x%x with hostbyte=0x%x, "
ef1cd466d439a1 Wenchao Hao     2023-04-28  7876  			"driverbyte=0x%x, statusbyte=0x%x, "
ef1cd466d439a1 Wenchao Hao     2023-04-28  7877  			"sense_key=0x%x, asc=0x%x, asq=0x%x\n",
ef1cd466d439a1 Wenchao Hao     2023-04-28  7878  			opcode, err.host_byte, err.driver_byte,
ef1cd466d439a1 Wenchao Hao     2023-04-28  7879  			err.status_byte, err.sense_key, err.asc, err.asq);
ef1cd466d439a1 Wenchao Hao     2023-04-28 @7880  		return ret;

ret is success.

ef1cd466d439a1 Wenchao Hao     2023-04-28  7881  	}
ef1cd466d439a1 Wenchao Hao     2023-04-28  7882  
3a90a63d02b8b7 Douglas Gilbert 2020-07-12  7883  	if (unlikely(inject_now && !atomic_read(&sdeb_inject_pending)))
3a90a63d02b8b7 Douglas Gilbert 2020-07-12  7884  		atomic_set(&sdeb_inject_pending, 1);
3a90a63d02b8b7 Douglas Gilbert 2020-07-12  7885  
c2248fc974df7b Douglas Gilbert 2014-11-24  7886  	na = oip->num_attached;
c2248fc974df7b Douglas Gilbert 2014-11-24  7887  	r_pfp = oip->pfp;

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