tree: https://github.com/intel/linux-intel-lts.git 5.4/yocto head: eeb611e5394c56d45c5cc8f7dc484c9f19e93143 commit: 5e9e6d86fe729cf81e8a0df5c53d326b9f2ec791 [415/1142] xlink-usb: XLink USB Remote and Local Host driver 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; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/misc/xlink-usb/local_host/u_xlink.c:1002 vpu_read_swid() error: uninitialized symbol 'BUF4'. vim +/BUF4 +1002 drivers/misc/xlink-usb/local_host/u_xlink.c 5e9e6d86fe729c Lai Jun Ann 2020-07-03 987 int *vpu_read_swid(void *data) 5e9e6d86fe729c Lai Jun Ann 2020-07-03 988 { 5e9e6d86fe729c Lai Jun Ann 2020-07-03 989 struct gs_port *port; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 990 5e9e6d86fe729c Lai Jun Ann 2020-07-03 991 port = ports[PORT_NUM].port; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 992 struct list_head *pool = &port->read_pool; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 993 int *BUF4; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 994 struct usb_request *req; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 995 5e9e6d86fe729c Lai Jun Ann 2020-07-03 996 while (!list_empty(pool)) { 5e9e6d86fe729c Lai Jun Ann 2020-07-03 997 req = list_entry(pool->next, struct usb_request, list); 5e9e6d86fe729c Lai Jun Ann 2020-07-03 998 list_del(&req->list); 5e9e6d86fe729c Lai Jun Ann 2020-07-03 999 BUF4 = req->buf; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 1000 break; 5e9e6d86fe729c Lai Jun Ann 2020-07-03 1001 } 5e9e6d86fe729c Lai Jun Ann 2020-07-03 @1002 return BUF4; ^^^^^^^^^^^ Can this be called when the pool list is empty? 5e9e6d86fe729c Lai Jun Ann 2020-07-03 1003 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org