Hi Maxime, I love your patch! Yet something to improve: [auto build test ERROR on next-20211020] [cannot apply to linus/master v5.15-rc6 v5.15-rc5 v5.15-rc4 v5.15-rc6] [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/Maxime-Ripard/drm-bridge-Make-pa... base: 51dba6e335ff9d1f6f50b5cacced8598956e1437 config: i386-randconfig-r033-20211021 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 3cea2505fd8d99a9ba0cb625aecfe28a47c4e3f8) 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 # https://github.com/0day-ci/linux/commit/585920edf3c968d2da5a1eeaa56a2a075... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Maxime-Ripard/drm-bridge-Make-panel-and-bridge-probe-order-consistent/20211021-154253 git checkout 585920edf3c968d2da5a1eeaa56a2a075d7067b9 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ret = drm_dp_aux_register(&ps_bridge->aux); ^ drivers/gpu/drm/bridge/parade-ps8640.c:408:6: error: use of undeclared identifier 'ret' if (ret) { ^ dev_err(dev, "failed to register DP AUX channel: %d\n", ret); ^ drivers/gpu/drm/bridge/parade-ps8640.c:409:59: error: use of undeclared identifier 'ret' dev_err(dev, "failed to register DP AUX channel: %d\n", ret); ^ drivers/gpu/drm/bridge/parade-ps8640.c:410:10: error: use of undeclared identifier 'ret' return ret; ^ 5 errors generated. vim +/ret +407 drivers/gpu/drm/bridge/parade-ps8640.c bc1aee7fc8f05b Jitao Shi 2019-12-30 398 a25b988ff83f3c Laurent Pinchart 2020-02-26 399 static int ps8640_bridge_attach(struct drm_bridge *bridge, a25b988ff83f3c Laurent Pinchart 2020-02-26 400 enum drm_bridge_attach_flags flags) bc1aee7fc8f05b Jitao Shi 2019-12-30 401 { bc1aee7fc8f05b Jitao Shi 2019-12-30 402 struct ps8640 *ps_bridge = bridge_to_ps8640(bridge); 812a65ba9411c5 Enric Balletbo i Serra 2020-08-26 403 812a65ba9411c5 Enric Balletbo i Serra 2020-08-26 404 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) 812a65ba9411c5 Enric Balletbo i Serra 2020-08-26 405 return -EINVAL; 812a65ba9411c5 Enric Balletbo i Serra 2020-08-26 406 13afcdd7277eff Philip Chen 2021-09-21 @407 ret = drm_dp_aux_register(&ps_bridge->aux); 13afcdd7277eff Philip Chen 2021-09-21 408 if (ret) { 13afcdd7277eff Philip Chen 2021-09-21 @409 dev_err(dev, "failed to register DP AUX channel: %d\n", ret); e1881ac0e79203 Maxime Ripard 2021-10-21 410 return ret; 13afcdd7277eff Philip Chen 2021-09-21 411 } bc1aee7fc8f05b Jitao Shi 2019-12-30 412 bc1aee7fc8f05b Jitao Shi 2019-12-30 413 /* Attach the panel-bridge to the dsi bridge */ bc1aee7fc8f05b Jitao Shi 2019-12-30 414 return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge, a25b988ff83f3c Laurent Pinchart 2020-02-26 415 &ps_bridge->bridge, flags); bc1aee7fc8f05b Jitao Shi 2019-12-30 416 } bc1aee7fc8f05b Jitao Shi 2019-12-30 417 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org