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SubjectRe: [PATCH v5 2/2] drm/bridge: Introduce LT8912B DSI to HDMI bridge
Hi Adrien,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.11 next-20210226]
[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/Adrien-Grassein/Add-support-of-Lontium-lt8912-MIPI-to-HDMI-bridge/20210228-001438
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3fb6d0e00efc958d01c2f109c8453033a2d96796
config: arm64-randconfig-r025-20210228 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 83bc7815c4235786111aa2abf7193292e4a602f5)
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 arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://github.com/0day-ci/linux/commit/2d98eba25528e00389795ddc110f56ac6adfde4c
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Adrien-Grassein/Add-support-of-Lontium-lt8912-MIPI-to-HDMI-bridge/20210228-001438
git checkout 2d98eba25528e00389795ddc110f56ac6adfde4c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/lontium-lt8912b.c:461:10: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
return ret;
^~~
drivers/gpu/drm/bridge/lontium-lt8912b.c:452:9: note: initialize the variable 'ret' to silence this warning
int ret, num = 0;
^
= 0
1 warning generated.


vim +/ret +461 drivers/gpu/drm/bridge/lontium-lt8912b.c

448
449 static int lt8912_connector_get_modes(struct drm_connector *connector)
450 {
451 struct edid *edid;
452 int ret, num = 0;
453 struct lt8912 *lt = connector_to_lt8912(connector);
454 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
455
456 edid = drm_bridge_get_edid(lt->hdmi_port, connector);
457 if (edid) {
458 drm_connector_update_edid_property(connector, edid);
459 num = drm_add_edid_modes(connector, edid);
460 } else
> 461 return ret;
462
463 ret = drm_display_info_set_bus_formats(&connector->display_info,
464 &bus_format, 1);
465 if (ret)
466 num = ret;
467
468 kfree(edid);
469 return num;
470 }
471

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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