Re: [PATCH net-next 4/8] pds_core: Prevent race issues involving the adminq

[kernel test robot]

Hi Brett,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Brett-Creeley/pds_core-Prevent-health-thread-from-running-during-reset-remove/20240105-011706
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240104171221.31399-5-brett.creeley%40amd.com
patch subject: [PATCH net-next 4/8] pds_core: Prevent race issues involving the adminq
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20240106/202401060952.4J8S3LbP-lkp@xxxxxxxxx/config)
compiler: s390-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240106/202401060952.4J8S3LbP-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401060952.4J8S3LbP-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/amd/pds_core/core.c:518:6: warning: no previous prototype for 'pdsc_adminq_wait_and_dec_once_unused' [-Wmissing-prototypes]
     518 | void pdsc_adminq_wait_and_dec_once_unused(struct pdsc *pdsc)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/pdsc_adminq_wait_and_dec_once_unused +518 drivers/net/ethernet/amd/pds_core/core.c

   517	
 > 518	void pdsc_adminq_wait_and_dec_once_unused(struct pdsc *pdsc)
   519	{
   520		/* The driver initializes the adminq_refcnt to 1 when the adminq is
   521		 * allocated and ready for use. Other users/requesters will increment
   522		 * the refcnt while in use. If the refcnt is down to 1 then the adminq
   523		 * is not in use and the refcnt can be cleared and adminq freed. Before
   524		 * calling this function the driver will set PDSC_S_FW_DEAD, which
   525		 * prevent subsequent attempts to use the adminq and increment the
   526		 * refcnt to fail. This guarantees that this function will eventually
   527		 * exit.
   528		 */
   529		while (!refcount_dec_if_one(&pdsc->adminq_refcnt)) {
   530			dev_dbg_ratelimited(pdsc->dev, "%s: adminq in use\n",
   531					    __func__);
   532			cpu_relax();
   533		}
   534	}
   535	

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