[PATCH 09/26] media: v4l2-dev: Add video_device_context_from_file()

[kernel test robot]

Hi Jacopo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on d968e50b5c26642754492dea23cbd3592bde62d8]

url:    https://github.com/intel-lab-lkp/linux/commits/Jacopo-Mondi/media-mc-Add-per-file-handle-data-support/20250717-190546
base:   d968e50b5c26642754492dea23cbd3592bde62d8
patch link:    https://lore.kernel.org/r/20250717-multicontext-mainline-2025-v1-9-81ac18979c03%40ideasonboard.com
patch subject: [PATCH 09/26] media: v4l2-dev: Add video_device_context_from_file()
config: x86_64-buildonly-randconfig-004-20250718 (https://download.01.org/0day-ci/archive/20250718/202507181702.W5iinHRF-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250718/202507181702.W5iinHRF-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507181702.W5iinHRF-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/media/v4l2-core/v4l2-dev.c:1184:1: warning: no previous prototype for function 'video_device_context_from_file' [-Wmissing-prototypes]
    1184 | video_device_context_from_file(struct file *filp, struct video_device *vfd)
         | ^
   drivers/media/v4l2-core/v4l2-dev.c:1183:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1183 | struct video_device_context *
         | ^
         | static 
   1 warning generated.


vim +/video_device_context_from_file +1184 drivers/media/v4l2-core/v4l2-dev.c

  1182	
  1183	struct video_device_context *
> 1184	video_device_context_from_file(struct file *filp, struct video_device *vfd)
  1185	{
  1186		struct v4l2_fh *vfh =
  1187			test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? filp->private_data
  1188								    : NULL;
  1189	
  1190		/* If the file handle has been bound to a context return it. */
  1191		if (vfh && vfh->context)
  1192			return vfh->context;
  1193	
  1194		return vfd->default_context;
  1195	}
  1196	EXPORT_SYMBOL_GPL(video_device_context_from_file);
  1197	

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