Hi Arnaud, url: https://github.com/0day-ci/linux/commits/Arnaud-Pouliquen/introduce-a-gen... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f40ddce88593482919761f74910f42f4b84c004b config: riscv-randconfig-m031-20210215 (attached as .config) compiler: riscv32-linux-gcc (GCC) 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/rpmsg/rpmsg_char.c:429 rpmsg_chrdev_probe() error: we previously assumed 'rpdev->ept' could be null (see line 423) vim +429 drivers/rpmsg/rpmsg_char.c 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 413 static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 414 { 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 415 struct rpmsg_channel_info chinfo; 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 416 struct rpmsg_eptdev *eptdev; 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 417 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 418 memcpy(chinfo.name, RPMSG_CHAR_DEVNAME, sizeof(RPMSG_CHAR_DEVNAME)); 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 419 chinfo.src = rpdev->src; 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 420 chinfo.dst = rpdev->dst; 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 421 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 422 eptdev = __rpmsg_chrdev_create_eptdev(rpdev, &rpdev->dev, chinfo); 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 @423 if (IS_ERR(eptdev) && rpdev->ept) { ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This condition is strange. 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 424 rpmsg_destroy_ept(rpdev->ept); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ What? Why are we undoing this when it's not something that we created? This seems like a layering violation... 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 425 return PTR_ERR(eptdev); 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 426 } 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 427 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 428 /* Set the private field of the default endpoint to retrieve context on callback. */ 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 @429 rpdev->ept->priv = eptdev; ^^^^^^^^^^^^^^^^^^^^^^^^^ If "rpdev->ept" is NULL this will Oops. If "eptdev" is an error pointer that seems wrong as well. 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 430 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 431 return 0; 7337f30f7a4426 Arnaud Pouliquen 2021-02-17 432 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org