Hi Dave,

I love your patch! Perhaps something to improve:

[auto build test WARNING on vkoul-dmaengine/next]
[also build test WARNING on v5.13-rc2]
[cannot apply to next-20210521]
[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]

url:    https://github.com/0day-ci/linux/commits/Dave-Jiang/Fix-idxd-sub-drivers-setup/20210522-230724
base:   https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next
config: x86_64-randconfig-a005-20210523 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project e84a9b9bb3051c35dea993cdad7b3d2575638f85)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/0day-ci/linux/commit/42d79fbe271bbc2b3790fc938d6e024a430700e8
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Dave-Jiang/Fix-idxd-sub-drivers-setup/20210522-230724
        git checkout 42d79fbe271bbc2b3790fc938d6e024a430700e8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/dma/idxd/device.c:1267:6: warning: variable 'rc' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/dma/idxd/device.c:1270:6: note: uninitialized use occurs here
           if (rc < 0)
               ^~
   drivers/dma/idxd/device.c:1267:2: note: remove the 'if' if its condition is always true
           if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/dma/idxd/device.c:1255:8: note: initialize the variable 'rc' to silence this warning
           int rc;
                 ^
                  = 0
   1 warning generated.


vim +1267 drivers/dma/idxd/device.c

  1250	
  1251	int idxd_device_drv_probe(struct idxd_dev *idxd_dev)
  1252	{
  1253		struct idxd_device *idxd = idxd_dev_to_idxd(idxd_dev);
  1254		unsigned long flags;
  1255		int rc;
  1256	
  1257		/*
  1258		 * Device should be in disabled state for the idxd_drv to load. If it's in
  1259		 * enabled state, then the device was altered outside of driver's control.
  1260		 * If the state is in halted state, then we don't want to proceed.
  1261		 */
  1262		if (idxd->state != IDXD_DEV_DISABLED)
  1263			return -ENXIO;
  1264	
  1265		/* Device configuration */
  1266		spin_lock_irqsave(&idxd->dev_lock, flags);
> 1267		if (test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org