Hi Guenter, I love your patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [also build test WARNING on v5.9-rc3 next-20200828] [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/Guenter-Roeck/media-uvcvideo-Fix-race-conditions/20200830-230715 base: git://linuxtv.org/media_tree.git master config: x86_64-randconfig-s031-20200901 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-191-g10164920-dirty # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> sparse warnings: (new ones prefixed by >>) >> drivers/media/usb/uvc/uvc_queue.c:402:21: sparse: sparse: incorrect type in assignment (different base types) @@ expected restricted __poll_t [usertype] ret @@ got int @@ >> drivers/media/usb/uvc/uvc_queue.c:402:21: sparse: expected restricted __poll_t [usertype] ret >> drivers/media/usb/uvc/uvc_queue.c:402:21: sparse: got int # https://github.com/0day-ci/linux/commit/9128827e77bc077a6fefd3ca886a8466e84f7154 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Guenter-Roeck/media-uvcvideo-Fix-race-conditions/20200830-230715 git checkout 9128827e77bc077a6fefd3ca886a8466e84f7154 vim +402 drivers/media/usb/uvc/uvc_queue.c 393 394 __poll_t uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, 395 poll_table *wait) 396 { 397 struct uvc_streaming *stream = uvc_queue_to_stream(queue); 398 __poll_t ret; 399 400 mutex_lock(&queue->mutex); 401 if (!video_is_registered(&stream->vdev)) { > 402 ret = -ENODEV; 403 goto unlock; 404 } 405 ret = vb2_poll(&queue->queue, file, wait); 406 unlock: 407 mutex_unlock(&queue->mutex); 408 409 return ret; 410 } 411 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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