Re: [PATCH v2 3/6] ata: libata-scsi: Remove redundant sense_buffer memsets

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

Hi Igor,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.10-rc5 next-20240625]
[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/Igor-Pylypiv/ata-libata-scsi-Do-not-overwrite-valid-sense-data-when-CK_COND-1/20240625-215527
base:   linus/master
patch link:    https://lore.kernel.org/r/20240624221211.2593736-4-ipylypiv%40google.com
patch subject: [PATCH v2 3/6] ata: libata-scsi: Remove redundant sense_buffer memsets
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20240626/202406261836.Q3sEjY8b-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240626/202406261836.Q3sEjY8b-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406261836.Q3sEjY8b-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/ata/libata-scsi.c: In function 'ata_gen_passthru_sense':
>> drivers/ata/libata-scsi.c:929:24: warning: unused variable 'sb' [-Wunused-variable]
     929 |         unsigned char *sb = cmd->sense_buffer;
         |                        ^~


vim +/sb +929 drivers/ata/libata-scsi.c

^1da177e4c3f41 drivers/scsi/libata-scsi.c Linus Torvalds  2005-04-16  909  
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  910  /*
750426aa1ad1dd drivers/ata/libata-scsi.c  Tejun Heo       2006-11-14  911   *	ata_gen_passthru_sense - Generate check condition sense block.
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  912   *	@qc: Command that completed.
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  913   *
2dc8b0ba527a4a drivers/ata/libata-scsi.c  Igor Pylypiv    2024-06-24  914   *	This function is specific to the ATA pass through commands.
2dc8b0ba527a4a drivers/ata/libata-scsi.c  Igor Pylypiv    2024-06-24  915   *	Regardless of whether the command errored or not, return a sense
84a9a8cd9d0aa9 drivers/ata/libata-scsi.c  Gwendal Grignou 2013-01-18  916   *	block. If there was no error, we get the request from an ATA
84a9a8cd9d0aa9 drivers/ata/libata-scsi.c  Gwendal Grignou 2013-01-18  917   *	passthrough command, so we use the following sense data:
84a9a8cd9d0aa9 drivers/ata/libata-scsi.c  Gwendal Grignou 2013-01-18  918   *	sk = RECOVERED ERROR
84a9a8cd9d0aa9 drivers/ata/libata-scsi.c  Gwendal Grignou 2013-01-18  919   *	asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
84a9a8cd9d0aa9 drivers/ata/libata-scsi.c  Gwendal Grignou 2013-01-18  920   *      
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  921   *
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  922   *	LOCKING:
750426aa1ad1dd drivers/ata/libata-scsi.c  Tejun Heo       2006-11-14  923   *	None.
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  924   */
750426aa1ad1dd drivers/ata/libata-scsi.c  Tejun Heo       2006-11-14  925  static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  926  {
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  927  	struct scsi_cmnd *cmd = qc->scsicmd;
e61e067227bc76 drivers/scsi/libata-scsi.c Tejun Heo       2006-05-15  928  	struct ata_taskfile *tf = &qc->result_tf;
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12 @929  	unsigned char *sb = cmd->sense_buffer;
b525e7731b90eb drivers/ata/libata-scsi.c  Hannes Reinecke 2016-04-04  930  	u8 sense_key, asc, ascq;
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  931  
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  932  	/*
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  933  	 * Use ata_to_sense_error() to map status register bits
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  934  	 * onto sense key, asc & ascq.
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  935  	 */
058e55e120ca59 drivers/scsi/libata-scsi.c Tejun Heo       2006-04-02  936  	if (qc->err_mask ||
efcef265fd83d9 drivers/ata/libata-scsi.c  Sergey Shtylyov 2022-02-15  937  	    tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
efcef265fd83d9 drivers/ata/libata-scsi.c  Sergey Shtylyov 2022-02-15  938  		ata_to_sense_error(qc->ap->print_id, tf->status, tf->error,
ff8072d589dcff drivers/ata/libata-scsi.c  Hannes Reinecke 2023-07-31  939  				   &sense_key, &asc, &ascq);
06dbde5f3a4424 drivers/ata/libata-scsi.c  Hannes Reinecke 2016-04-04  940  		ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);
84a9a8cd9d0aa9 drivers/ata/libata-scsi.c  Gwendal Grignou 2013-01-18  941  	} else {
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  942  		/*
11093cb1ef5614 drivers/ata/libata-scsi.c  Hannes Reinecke 2016-04-04  943  		 * ATA PASS-THROUGH INFORMATION AVAILABLE
11093cb1ef5614 drivers/ata/libata-scsi.c  Hannes Reinecke 2016-04-04  944  		 * Always in descriptor format sense.
b095518ef51c37 drivers/scsi/libata-scsi.c Jeff Garzik     2005-05-12  945  		 */
f2b1e9c6f867ec drivers/ata/libata-scsi.c  Hannes Reinecke 2021-04-27  946  		scsi_build_sense(cmd, 1, RECOVERED_ERROR, 0, 0x1D);
11093cb1ef5614 drivers/ata/libata-scsi.c  Hannes Reinecke 2016-04-04  947  	}
^1da177e4c3f41 drivers/scsi/libata-scsi.c Linus Torvalds  2005-04-16  948  }
^1da177e4c3f41 drivers/scsi/libata-scsi.c Linus Torvalds  2005-04-16  949  

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