Hi Lad, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [also build test WARNING on v5.8-rc6 next-20200724] [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/Lad-Prabhakar/media-i2c-ov772x-Enable-BT656-mode-and-test-pattern-support/20200724-231016 base: git://linuxtv.org/media_tree.git master config: x86_64-allyesconfig (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1d09ecf36175f7910ffedd6d497c07b5c74c22fb) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/media/i2c/ov772x.c:1425:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (!endpoint) { ^~~~~~~~~ drivers/media/i2c/ov772x.c:1471:9: note: uninitialized use occurs here return ret; ^~~ drivers/media/i2c/ov772x.c:1425:2: note: remove the 'if' if its condition is always false if (!endpoint) { ^~~~~~~~~~~~~~~~ drivers/media/i2c/ov772x.c:1363:11: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning generated. vim +1425 drivers/media/i2c/ov772x.c 1354 1355 /* 1356 * i2c_driver function 1357 */ 1358 1359 static int ov772x_probe(struct i2c_client *client) 1360 { 1361 struct fwnode_handle *endpoint; 1362 struct ov772x_priv *priv; 1363 int ret; 1364 static const struct regmap_config ov772x_regmap_config = { 1365 .reg_bits = 8, 1366 .val_bits = 8, 1367 .max_register = DSPAUTO, 1368 }; 1369 1370 if (!client->dev.of_node && !client->dev.platform_data) { 1371 dev_err(&client->dev, 1372 "Missing ov772x platform data for non-DT device\n"); 1373 return -EINVAL; 1374 } 1375 1376 priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); 1377 if (!priv) 1378 return -ENOMEM; 1379 1380 priv->regmap = devm_regmap_init_sccb(client, &ov772x_regmap_config); 1381 if (IS_ERR(priv->regmap)) { 1382 dev_err(&client->dev, "Failed to allocate register map\n"); 1383 return PTR_ERR(priv->regmap); 1384 } 1385 1386 priv->info = client->dev.platform_data; 1387 mutex_init(&priv->lock); 1388 1389 v4l2_i2c_subdev_init(&priv->subdev, client, &ov772x_subdev_ops); 1390 priv->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | 1391 V4L2_SUBDEV_FL_HAS_EVENTS; 1392 v4l2_ctrl_handler_init(&priv->hdl, 3); 1393 /* Use our mutex for the controls */ 1394 priv->hdl.lock = &priv->lock; 1395 priv->vflip_ctrl = v4l2_ctrl_new_std(&priv->hdl, &ov772x_ctrl_ops, 1396 V4L2_CID_VFLIP, 0, 1, 1, 0); 1397 priv->hflip_ctrl = v4l2_ctrl_new_std(&priv->hdl, &ov772x_ctrl_ops, 1398 V4L2_CID_HFLIP, 0, 1, 1, 0); 1399 priv->band_filter_ctrl = v4l2_ctrl_new_std(&priv->hdl, &ov772x_ctrl_ops, 1400 V4L2_CID_BAND_STOP_FILTER, 1401 0, 256, 1, 0); 1402 priv->subdev.ctrl_handler = &priv->hdl; 1403 if (priv->hdl.error) { 1404 ret = priv->hdl.error; 1405 goto error_mutex_destroy; 1406 } 1407 1408 priv->clk = clk_get(&client->dev, NULL); 1409 if (IS_ERR(priv->clk)) { 1410 dev_err(&client->dev, "Unable to get xclk clock\n"); 1411 ret = PTR_ERR(priv->clk); 1412 goto error_ctrl_free; 1413 } 1414 1415 priv->pwdn_gpio = gpiod_get_optional(&client->dev, "powerdown", 1416 GPIOD_OUT_LOW); 1417 if (IS_ERR(priv->pwdn_gpio)) { 1418 dev_info(&client->dev, "Unable to get GPIO \"powerdown\""); 1419 ret = PTR_ERR(priv->pwdn_gpio); 1420 goto error_clk_put; 1421 } 1422 1423 endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev), 1424 NULL); > 1425 if (!endpoint) { 1426 dev_err(&client->dev, "endpoint node not found\n"); 1427 goto error_clk_put; 1428 } 1429 1430 ret = v4l2_fwnode_endpoint_parse(endpoint, &priv->ep); 1431 fwnode_handle_put(endpoint); 1432 if (ret) { 1433 dev_err(&client->dev, "Could not parse endpoint\n"); 1434 goto error_clk_put; 1435 } 1436 1437 ret = ov772x_video_probe(priv); 1438 if (ret < 0) 1439 goto error_gpio_put; 1440 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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