tree: https://github.com/jgunthorpe/linux iommufd head: 6b5b3f20ed6b64824c2d447b4f4555fcb390bf3b commit: ae38950aefd81c9648c5416ec4a5003e4ec03e42 [18/31] drm/tegra: Use the iommu dma_owner mechanism config: arm-randconfig-c002-20220210 (https://download.01.org/0day-ci/archive/20220216/202202160335.Mb5DqLiM-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e8bff9ae54a55b4dbfeb6ba55f723abbd81bf494) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/jgunthorpe/linux/commit/ae38950aefd81c9648c5416ec4a500... git remote add jgunthorpe https://github.com/jgunthorpe/linux git fetch --no-tags jgunthorpe iommufd git checkout ae38950aefd81c9648c5416ec4a5003e4ec03e42 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <yujie.liu(a)intel.com&gt; clang-analyzer warnings: (new ones prefixed by >>) struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev); ^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/domain +998 drivers/gpu/drm/tegra/drm.c 0c407de5ed1a329 Thierry Reding 2018-05-04 995 aacdf19849734d1 Thierry Reding 2019-02-08 996 void host1x_client_iommu_detach(struct host1x_client *client) 0c407de5ed1a329 Thierry Reding 2018-05-04 997 { ae38950aefd81c9 Jason Gunthorpe 2021-11-18 @998 struct iommu_domain *domain = iommu_get_domain_for_dev(client->dev); 608f43ad27ab267 Thierry Reding 2019-12-02 999 struct drm_device *drm = dev_get_drvdata(client->host); 0c407de5ed1a329 Thierry Reding 2018-05-04 1000 struct tegra_drm *tegra = drm->dev_private; 0c407de5ed1a329 Thierry Reding 2018-05-04 1001 aacdf19849734d1 Thierry Reding 2019-02-08 1002 if (client->group) { ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1003 iommu_detach_device_shared(tegra->domain, client->dev); ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1004 iommu_device_release_dma_owner(client->dev, ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1005 DMA_OWNER_PRIVATE_DOMAIN); fa6661b7aa0b520 Thierry Reding 2019-10-28 1006 client->group = NULL; ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1007 } else { ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1008 iommu_device_release_dma_owner(client->dev, DMA_OWNER_DMA_API); 0c407de5ed1a329 Thierry Reding 2018-05-04 1009 } 0c407de5ed1a329 Thierry Reding 2018-05-04 1010 } 0c407de5ed1a329 Thierry Reding 2018-05-04 1011 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org