Re: [PATCH v2 5/5] drivers: media: platform: Add NPCM Video Capture/Encode Engine driver

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

Hi Marvin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linux/master linus/master v5.18-rc6]
[cannot apply to media-tree/master next-20220513]
[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/intel-lab-lkp/linux/commits/Marvin-Lin/Support-Nuvoton-NPCM-Video-Capture-Encode-Engine/20220513-113806
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220514/202205141815.QVBWWaqM-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 38189438b69ca27b4c6ce707c52dbd217583d046)
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
        # https://github.com/intel-lab-lkp/linux/commit/7fa1f7750e7317479ce2c2c043b44fa19c46b1a8
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Marvin-Lin/Support-Nuvoton-NPCM-Video-Capture-Encode-Engine/20220513-113806
        git checkout 7fa1f7750e7317479ce2c2c043b44fa19c46b1a8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/media/platform/nuvoton/

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/media/platform/nuvoton/npcm-video.c:1776:6: warning: variable 'empty' set but not used [-Wunused-but-set-variable]
           int empty;
               ^
   1 warning generated.


vim +/empty +1776 drivers/media/platform/nuvoton/npcm-video.c

  1773	
  1774	static void nuvoton_video_buf_queue(struct vb2_buffer *vb)
  1775	{
> 1776		int empty;
  1777		struct nuvoton_video *video = vb2_get_drv_priv(vb->vb2_queue);
  1778		struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  1779		struct nuvoton_video_buffer *nvb = to_nuvoton_video_buffer(vbuf);
  1780		unsigned long flags;
  1781	
  1782		dev_dbg(video->dev, "%s\n", __func__);
  1783	
  1784		spin_lock_irqsave(&video->lock, flags);
  1785		empty = list_empty(&video->buffers);
  1786		list_add_tail(&nvb->link, &video->buffers);
  1787		spin_unlock_irqrestore(&video->lock, flags);
  1788	}
  1789	

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