tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 2c4a98833ded50c324a6c5e7c949f93cca137acf [120/1142] misc: vpusmm: add alloc/import DMABuf for VPU config: i386-randconfig-m021-20201211 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; New smatch warnings: drivers/misc/vpusmm/vpusmm_driver.c:274 vpusmm_session_unimport_dmabuf() warn: inconsistent indenting drivers/misc/vpusmm/vpusmm_driver.c:301 vpusmm_open() warn: passing zero to 'PTR_ERR' drivers/misc/vpusmm/vpusmm_driver.c:842 vpusmm_probe() warn: passing zero to 'PTR_ERR' drivers/misc/vpusmm/vpusmm_driver.c:1047 vpusmm_init() warn: passing zero to 'PTR_ERR' Old smatch warnings: drivers/misc/vpusmm/vpusmm_driver.c:1061 vpusmm_init() warn: passing zero to 'PTR_ERR' vim +274 drivers/misc/vpusmm/vpusmm_driver.c 265 266 267 static void vpusmm_session_unimport_dmabuf( 268 struct vpusmm_session *sess, 269 struct dma_buf *dmabuf) 270 { 271 struct vpusmm_imported_dmabuf *item = NULL; 272 273 mutex_lock(&sess->imp_rb_lock); 275 if (item) { 276 item->refcount--; 277 if (item->refcount <= 0) { 278 rb_erase(&item->node, &sess->imp_rb); 279 dma_buf_unmap_attachment(item->attach, item->sgt, item->direction); 280 dma_buf_detach(item->dmabuf, item->attach); 281 dma_buf_put(item->dmabuf); 282 kfree(item); 283 } 284 } 285 mutex_unlock(&sess->imp_rb_lock); 286 } 287 288 /****************************** 289 * driver's open/release fops * 290 ******************************/ 291 static int vpusmm_open(struct inode *inode, struct file *filp) 292 { 293 int retval = 0; 294 struct vpusmm_session *sess; 295 struct vpusmm_device *dev; 296 297 dev = container_of(inode->i_cdev, struct vpusmm_device, cdev); 298 299 sess = kzalloc(sizeof(*sess), GFP_KERNEL); 300 if (IS_ERR_OR_NULL(sess)) { 302 sess = NULL; 303 goto failed; 304 } 305 sess->dev = dev; 306 sess->imp_rb = RB_ROOT; 307 308 mutex_init(&sess->imp_rb_lock); 309 310 // create session 311 filp->private_data = sess; 312 313 return retval; 314 failed: 315 return retval; 316 } 317 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org