linux-kernel - [superna9999:amlogic/v5.18/g12-dsi-wip 13/14] drivers/gpu/drm/meson/meson_encoder_dsi.c:122:69: warning: variable 'ret' is uninitialized when used here

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Date:   Sat, 22 Jan 2022 02:50:45 +0800
From:   kernel test robot <lkp@...el.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: [superna9999:amlogic/v5.18/g12-dsi-wip 13/14]
 drivers/gpu/drm/meson/meson_encoder_dsi.c:122:69: warning: variable 'ret' is
 uninitialized when used here

tree:   https://github.com/superna9999/linux amlogic/v5.18/g12-dsi-wip
head:   fbcc0a7f53880919dc415da44339313dd59768f0
commit: 69065af6f6c3f3c1a6a29ab765c02e8371be3a42 [13/14] drm/meson: add DSI encoder
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20220122/202201220231.SSLn9QGA-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce)
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/superna9999/linux/commit/69065af6f6c3f3c1a6a29ab765c02e8371be3a42
        git remote add superna9999 https://github.com/superna9999/linux
        git fetch --no-tags superna9999 amlogic/v5.18/g12-dsi-wip
        git checkout 69065af6f6c3f3c1a6a29ab765c02e8371be3a42
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/meson/

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/meson/meson_encoder_dsi.c:122:69: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
                   dev_dbg(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret);
                                                                                     ^~~
   include/linux/dev_printk.h:155:39: note: expanded from macro 'dev_dbg'
           dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
                                                ^~~~~~~~~~~
   include/linux/dynamic_debug.h:167:19: note: expanded from macro 'dynamic_dev_dbg'
                              dev, fmt, ##__VA_ARGS__)
                                          ^~~~~~~~~~~
   include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call'
           __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__)
                                                                 ^~~~~~~~~~~
   include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call'
                   func(&id, ##__VA_ARGS__);               \
                               ^~~~~~~~~~~
   drivers/gpu/drm/meson/meson_encoder_dsi.c:107:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +/ret +122 drivers/gpu/drm/meson/meson_encoder_dsi.c

   102	
   103	int meson_encoder_dsi_init(struct meson_drm *priv)
   104	{
   105		struct meson_encoder_dsi *meson_encoder_dsi;
   106		struct device_node *remote;
   107		int ret;
   108	
   109		meson_encoder_dsi = devm_kzalloc(priv->dev, sizeof(*meson_encoder_dsi), GFP_KERNEL);
   110		if (!meson_encoder_dsi)
   111			return -ENOMEM;
   112	
   113		/* DSI Transceiver Bridge */
   114		remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
   115		if (!remote) {
   116			dev_err(priv->dev, "DSI transceiver device is disabled");
   117			return 0;
   118		}
   119	
   120		meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
   121		if (!meson_encoder_dsi->next_bridge) {
 > 122			dev_dbg(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret);

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