Re: [PATCH 2/2] scsi: mpi3mr: Add initialization for ATTO 24Gb SAS HBAs

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

Hi Steve,

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 v6.16-rc1 next-20250613]
[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/Steve-Siwinski/scsi-mpi3mr-Add-initialization-for-ATTO-24Gb-SAS-HBAs/20250614-043438
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi.git for-next
patch link:    https://lore.kernel.org/r/20250613202941.62114-2-ssiwinski%40atto.com
patch subject: [PATCH 2/2] scsi: mpi3mr: Add initialization for ATTO 24Gb SAS HBAs
config: x86_64-buildonly-randconfig-002-20250614 (https://download.01.org/0day-ci/archive/20250614/202506142037.j39pVyE8-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250614/202506142037.j39pVyE8-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/202506142037.j39pVyE8-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/scsi/mpi3mr/mpi3mr_fw.c:1644:47: warning: variable 'scratch_pad0' set but not used [-Wunused-but-set-variable]
    1644 |         u32 host_diagnostic, ioc_status, ioc_config, scratch_pad0;
         |                                                      ^
>> drivers/scsi/mpi3mr/mpi3mr_fw.c:4272:6: warning: variable 'r' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
    4272 |         if (!driver_pg2)
         |             ^~~~~~~~~~~
   drivers/scsi/mpi3mr/mpi3mr_fw.c:4290:9: note: uninitialized use occurs here
    4290 |         return r;
         |                ^
   drivers/scsi/mpi3mr/mpi3mr_fw.c:4272:2: note: remove the 'if' if its condition is always false
    4272 |         if (!driver_pg2)
         |         ^~~~~~~~~~~~~~~~
    4273 |                 goto out;
         |                 ~~~~~~~~
   drivers/scsi/mpi3mr/mpi3mr_fw.c:4267:7: note: initialize the variable 'r' to silence this warning
    4267 |         int r;
         |              ^
         |               = 0
   2 warnings generated.
--
>> Warning: drivers/scsi/mpi3mr/mpi3mr_fw.c:4262 function parameter 'sas_address' not described in 'mpi3mr_atto_get_sas_addr'
>> Warning: drivers/scsi/mpi3mr/mpi3mr_fw.c:6468 function parameter 'man_pg5' not described in 'mpi3mr_cfg_get_man_pg5'
>> Warning: drivers/scsi/mpi3mr/mpi3mr_fw.c:6468 Excess function parameter 'io_unit_pg5' description in 'mpi3mr_cfg_get_man_pg5'
>> Warning: drivers/scsi/mpi3mr/mpi3mr_fw.c:6524 function parameter 'man_pg5' not described in 'mpi3mr_cfg_set_man_pg5'
>> Warning: drivers/scsi/mpi3mr/mpi3mr_fw.c:6524 Excess function parameter 'io_unit_pg5' description in 'mpi3mr_cfg_set_man_pg5'


vim +4272 drivers/scsi/mpi3mr/mpi3mr_fw.c

  4254	
  4255	/**
  4256	 * mpi3mr_atto_get_sas_addr - get the ATTO SAS address from driver page 2
  4257	 *
  4258	 * @mrioc: Adapter instance reference
  4259	 * @*sas_address: return sas address
  4260	 * Return: 0 for success, non-zero for failure.
  4261	 */
> 4262	static int mpi3mr_atto_get_sas_addr(struct mpi3mr_ioc *mrioc, union ATTO_SAS_ADDRESS *sas_address)
  4263	{
  4264		struct mpi3_driver_page2 *driver_pg2 = NULL;
  4265		struct ATTO_SAS_NVRAM *nvram;
  4266		u16 sz;
  4267		int r;
  4268		__be64 addr;
  4269	
  4270		sz = mpi3mr_cfg_get_page_size(mrioc, MPI3_CONFIG_PAGETYPE_DRIVER, 2);
  4271		driver_pg2 = kzalloc(sz, GFP_KERNEL);
> 4272		if (!driver_pg2)
  4273			goto out;
  4274	
  4275		r = mpi3mr_cfg_get_driver_pg2(mrioc, driver_pg2, sz, MPI3_CONFIG_ACTION_READ_PERSISTENT);
  4276		if (r)
  4277			goto out;
  4278	
  4279		nvram = (struct ATTO_SAS_NVRAM *) &driver_pg2->trigger;
  4280	
  4281		r = mpi3mr_atto_validate_nvram(mrioc, nvram);
  4282		if (r)
  4283			goto out;
  4284	
  4285		addr = *((__be64 *) nvram->sasaddr);
  4286		sas_address->q = cpu_to_le64(be64_to_cpu(addr));
  4287	
  4288	out:
  4289		kfree(driver_pg2);
  4290		return r;
  4291	}
  4292	

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