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Fri, 03 Oct 2025 03:57:15 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-46e619b7e37sm121671965e9.1.2025.10.03.03.57.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Oct 2025 03:57:15 -0700 (PDT) Date: Fri, 3 Oct 2025 13:57:11 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Marcus Folkesson , Wolfram Sang , Peter Rosin , Michael Hennerich , Bartosz Golaszewski , Andi Shyti Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Marcus Folkesson Subject: Re: [PATCH v2 2/5] i2c: mux: add support for per channel bus frequency Message-ID: <202510031735.TE7FVj0R-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251002-i2c-mux-v2-2-b698564cd956@gmail.com> Hi Marcus, kernel test robot noticed the following build warnings: url: https://github.com/intel-lab-lkp/linux/commits/Marcus-Folkesson/i2c-core-add-callback-to-change-bus-frequency/20251002-224414 base: 22f20375f5b71f30c0d6896583b93b6e4bba7279 patch link: https://lore.kernel.org/r/20251002-i2c-mux-v2-2-b698564cd956%40gmail.com patch subject: [PATCH v2 2/5] i2c: mux: add support for per channel bus frequency config: i386-randconfig-141-20251003 (https://download.01.org/0day-ci/archive/20251003/202510031735.TE7FVj0R-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202510031735.TE7FVj0R-lkp@intel.com/ smatch warnings: drivers/i2c/i2c-mux.c:506 i2c_mux_add_adapter() error: uninitialized symbol 'ret'. vim +/ret +506 drivers/i2c/i2c-mux.c a7ab72390b7706 Peter Rosin 2016-04-20 336 int i2c_mux_add_adapter(struct i2c_mux_core *muxc, fec1982d70721c Heiner Kallweit 2024-04-18 337 u32 force_nr, u32 chan_id) a7ab72390b7706 Peter Rosin 2016-04-20 338 { a7ab72390b7706 Peter Rosin 2016-04-20 339 struct i2c_adapter *parent = muxc->parent; 0826374bff5741 Michael Lawnick 2010-08-11 340 struct i2c_mux_priv *priv; c9449affad2ae0 Gerlando Falauto 2014-11-13 341 char symlink_name[20]; 0826374bff5741 Michael Lawnick 2010-08-11 342 int ret; 0826374bff5741 Michael Lawnick 2010-08-11 343 a7ab72390b7706 Peter Rosin 2016-04-20 344 if (muxc->num_adapters >= muxc->max_adapters) { a7ab72390b7706 Peter Rosin 2016-04-20 345 dev_err(muxc->dev, "No room for more i2c-mux adapters\n"); a7ab72390b7706 Peter Rosin 2016-04-20 346 return -EINVAL; a7ab72390b7706 Peter Rosin 2016-04-20 347 } a7ab72390b7706 Peter Rosin 2016-04-20 348 a7ab72390b7706 Peter Rosin 2016-04-20 349 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 0826374bff5741 Michael Lawnick 2010-08-11 350 if (!priv) a7ab72390b7706 Peter Rosin 2016-04-20 351 return -ENOMEM; 0826374bff5741 Michael Lawnick 2010-08-11 352 0826374bff5741 Michael Lawnick 2010-08-11 353 /* Set up private adapter data */ a7ab72390b7706 Peter Rosin 2016-04-20 354 priv->muxc = muxc; 0826374bff5741 Michael Lawnick 2010-08-11 355 priv->chan_id = chan_id; 0826374bff5741 Michael Lawnick 2010-08-11 356 0826374bff5741 Michael Lawnick 2010-08-11 357 /* Need to do algo dynamically because we don't know ahead 0826374bff5741 Michael Lawnick 2010-08-11 358 * of time what sort of physical adapter we'll be dealing with. 0826374bff5741 Michael Lawnick 2010-08-11 359 */ 6ef91fcca8a8ba Peter Rosin 2016-05-04 360 if (parent->algo->master_xfer) { 6ef91fcca8a8ba Peter Rosin 2016-05-04 361 if (muxc->mux_locked) 614b1c3cbfb0ec Wolfram Sang 2025-06-12 362 priv->algo.xfer = i2c_mux_master_xfer; 6ef91fcca8a8ba Peter Rosin 2016-05-04 363 else 614b1c3cbfb0ec Wolfram Sang 2025-06-12 364 priv->algo.xfer = __i2c_mux_master_xfer; 6ef91fcca8a8ba Peter Rosin 2016-05-04 365 } 7168bff2cfd710 Wolfram Sang 2019-04-03 366 if (parent->algo->master_xfer_atomic) 614b1c3cbfb0ec Wolfram Sang 2025-06-12 367 priv->algo.xfer_atomic = priv->algo.master_xfer; 7168bff2cfd710 Wolfram Sang 2019-04-03 368 6ef91fcca8a8ba Peter Rosin 2016-05-04 369 if (parent->algo->smbus_xfer) { 6ef91fcca8a8ba Peter Rosin 2016-05-04 370 if (muxc->mux_locked) 0826374bff5741 Michael Lawnick 2010-08-11 371 priv->algo.smbus_xfer = i2c_mux_smbus_xfer; 6ef91fcca8a8ba Peter Rosin 2016-05-04 372 else 6ef91fcca8a8ba Peter Rosin 2016-05-04 373 priv->algo.smbus_xfer = __i2c_mux_smbus_xfer; 6ef91fcca8a8ba Peter Rosin 2016-05-04 374 } 7168bff2cfd710 Wolfram Sang 2019-04-03 375 if (parent->algo->smbus_xfer_atomic) 7168bff2cfd710 Wolfram Sang 2019-04-03 376 priv->algo.smbus_xfer_atomic = priv->algo.smbus_xfer; 7168bff2cfd710 Wolfram Sang 2019-04-03 377 0826374bff5741 Michael Lawnick 2010-08-11 378 priv->algo.functionality = i2c_mux_functionality; 0826374bff5741 Michael Lawnick 2010-08-11 379 0826374bff5741 Michael Lawnick 2010-08-11 380 /* Now fill out new adapter structure */ 0826374bff5741 Michael Lawnick 2010-08-11 381 snprintf(priv->adap.name, sizeof(priv->adap.name), 0826374bff5741 Michael Lawnick 2010-08-11 382 "i2c-%d-mux (chan_id %d)", i2c_adapter_id(parent), chan_id); 0826374bff5741 Michael Lawnick 2010-08-11 383 priv->adap.owner = THIS_MODULE; 0826374bff5741 Michael Lawnick 2010-08-11 384 priv->adap.algo = &priv->algo; 0826374bff5741 Michael Lawnick 2010-08-11 385 priv->adap.algo_data = priv; 0826374bff5741 Michael Lawnick 2010-08-11 386 priv->adap.dev.parent = &parent->dev; 2212a8529eb06c Elie De Brauwer 2013-12-09 387 priv->adap.retries = parent->retries; 2212a8529eb06c Elie De Brauwer 2013-12-09 388 priv->adap.timeout = parent->timeout; dc362d50ba94ea Alexander Sverdlin 2015-06-12 389 priv->adap.quirks = parent->quirks; d1ed7985b9a6b8 Peter Rosin 2016-08-25 390 if (muxc->mux_locked) d1ed7985b9a6b8 Peter Rosin 2016-08-25 391 priv->adap.lock_ops = &i2c_mux_lock_ops; d1ed7985b9a6b8 Peter Rosin 2016-08-25 392 else d1ed7985b9a6b8 Peter Rosin 2016-08-25 393 priv->adap.lock_ops = &i2c_parent_lock_ops; 0826374bff5741 Michael Lawnick 2010-08-11 394 bc45449b144461 David Daney 2012-04-12 395 /* bc45449b144461 David Daney 2012-04-12 396 * Try to populate the mux adapter's of_node, expands to bc45449b144461 David Daney 2012-04-12 397 * nothing if !CONFIG_OF. bc45449b144461 David Daney 2012-04-12 398 */ a7ab72390b7706 Peter Rosin 2016-04-20 399 if (muxc->dev->of_node) { b2d57b56047b99 Peter Rosin 2016-07-09 400 struct device_node *dev_node = muxc->dev->of_node; b2d57b56047b99 Peter Rosin 2016-07-09 401 struct device_node *mux_node, *child = NULL; bc45449b144461 David Daney 2012-04-12 402 u32 reg; bc45449b144461 David Daney 2012-04-12 403 b2d57b56047b99 Peter Rosin 2016-07-09 404 if (muxc->arbitrator) b2d57b56047b99 Peter Rosin 2016-07-09 405 mux_node = of_get_child_by_name(dev_node, "i2c-arb"); b2d57b56047b99 Peter Rosin 2016-07-09 406 else if (muxc->gate) b2d57b56047b99 Peter Rosin 2016-07-09 407 mux_node = of_get_child_by_name(dev_node, "i2c-gate"); b2d57b56047b99 Peter Rosin 2016-07-09 408 else b2d57b56047b99 Peter Rosin 2016-07-09 409 mux_node = of_get_child_by_name(dev_node, "i2c-mux"); b2d57b56047b99 Peter Rosin 2016-07-09 410 b2d57b56047b99 Peter Rosin 2016-07-09 411 if (mux_node) { b2d57b56047b99 Peter Rosin 2016-07-09 412 /* A "reg" property indicates an old-style DT entry */ b2d57b56047b99 Peter Rosin 2016-07-09 413 if (!of_property_read_u32(mux_node, "reg", ®)) { b2d57b56047b99 Peter Rosin 2016-07-09 414 of_node_put(mux_node); b2d57b56047b99 Peter Rosin 2016-07-09 415 mux_node = NULL; b2d57b56047b99 Peter Rosin 2016-07-09 416 } b2d57b56047b99 Peter Rosin 2016-07-09 417 } b2d57b56047b99 Peter Rosin 2016-07-09 418 b2d57b56047b99 Peter Rosin 2016-07-09 419 if (!mux_node) b2d57b56047b99 Peter Rosin 2016-07-09 420 mux_node = of_node_get(dev_node); b2d57b56047b99 Peter Rosin 2016-07-09 421 else if (muxc->arbitrator || muxc->gate) b2d57b56047b99 Peter Rosin 2016-07-09 422 child = of_node_get(mux_node); b2d57b56047b99 Peter Rosin 2016-07-09 423 b2d57b56047b99 Peter Rosin 2016-07-09 424 if (!child) { b2d57b56047b99 Peter Rosin 2016-07-09 425 for_each_child_of_node(mux_node, child) { bc45449b144461 David Daney 2012-04-12 426 ret = of_property_read_u32(child, "reg", ®); bc45449b144461 David Daney 2012-04-12 427 if (ret) bc45449b144461 David Daney 2012-04-12 428 continue; b2d57b56047b99 Peter Rosin 2016-07-09 429 if (chan_id == reg) bc45449b144461 David Daney 2012-04-12 430 break; bc45449b144461 David Daney 2012-04-12 431 } 64f0150a54ef60 Marcus Folkesson 2025-10-02 432 } 64f0150a54ef60 Marcus Folkesson 2025-10-02 433 64f0150a54ef60 Marcus Folkesson 2025-10-02 434 of_property_read_u32(child, "clock-frequency", &priv->adap.clock_hz); 64f0150a54ef60 Marcus Folkesson 2025-10-02 435 64f0150a54ef60 Marcus Folkesson 2025-10-02 436 /* 64f0150a54ef60 Marcus Folkesson 2025-10-02 437 * Warn if the mux adapter is not parent-locked as 64f0150a54ef60 Marcus Folkesson 2025-10-02 438 * this may cause issues for some hardware topologies. 64f0150a54ef60 Marcus Folkesson 2025-10-02 439 */ 64f0150a54ef60 Marcus Folkesson 2025-10-02 440 if ((priv->adap.clock_hz < parent->clock_hz) && muxc->mux_locked) 64f0150a54ef60 Marcus Folkesson 2025-10-02 441 dev_warn(muxc->dev, 64f0150a54ef60 Marcus Folkesson 2025-10-02 442 "channel %u is slower than parent on a non parent-locked mux\n", 64f0150a54ef60 Marcus Folkesson 2025-10-02 443 chan_id); 64f0150a54ef60 Marcus Folkesson 2025-10-02 444 64f0150a54ef60 Marcus Folkesson 2025-10-02 445 /* If the mux adapter has no clock-frequency property, inherit from parent */ 64f0150a54ef60 Marcus Folkesson 2025-10-02 446 if (!priv->adap.clock_hz) 64f0150a54ef60 Marcus Folkesson 2025-10-02 447 priv->adap.clock_hz = parent->clock_hz; 64f0150a54ef60 Marcus Folkesson 2025-10-02 448 64f0150a54ef60 Marcus Folkesson 2025-10-02 449 /* We don't support mux adapters faster than their parent */ 64f0150a54ef60 Marcus Folkesson 2025-10-02 450 if (priv->adap.clock_hz > parent->clock_hz) { 64f0150a54ef60 Marcus Folkesson 2025-10-02 451 dev_err(muxc->dev, 64f0150a54ef60 Marcus Folkesson 2025-10-02 452 "channel (%u) is faster (%u) than parent (%u)\n", 64f0150a54ef60 Marcus Folkesson 2025-10-02 453 chan_id, priv->adap.clock_hz, parent->clock_hz); 64f0150a54ef60 Marcus Folkesson 2025-10-02 454 64f0150a54ef60 Marcus Folkesson 2025-10-02 455 of_node_put(mux_node); 64f0150a54ef60 Marcus Folkesson 2025-10-02 456 goto err_free_priv; ret = -EINVAL; bc45449b144461 David Daney 2012-04-12 457 } b2d57b56047b99 Peter Rosin 2016-07-09 458 b2d57b56047b99 Peter Rosin 2016-07-09 459 priv->adap.dev.of_node = child; b2d57b56047b99 Peter Rosin 2016-07-09 460 of_node_put(mux_node); bc45449b144461 David Daney 2012-04-12 461 } bc45449b144461 David Daney 2012-04-12 462 8eb5c87a92c065 Dustin Byford 2015-10-23 463 /* 8eb5c87a92c065 Dustin Byford 2015-10-23 464 * Associate the mux channel with an ACPI node. 8eb5c87a92c065 Dustin Byford 2015-10-23 465 */ a7ab72390b7706 Peter Rosin 2016-04-20 466 if (has_acpi_companion(muxc->dev)) a7ab72390b7706 Peter Rosin 2016-04-20 467 acpi_preset_companion(&priv->adap.dev, a7ab72390b7706 Peter Rosin 2016-04-20 468 ACPI_COMPANION(muxc->dev), 8eb5c87a92c065 Dustin Byford 2015-10-23 469 chan_id); 8eb5c87a92c065 Dustin Byford 2015-10-23 470 0826374bff5741 Michael Lawnick 2010-08-11 471 if (force_nr) { 0826374bff5741 Michael Lawnick 2010-08-11 472 priv->adap.nr = force_nr; 0826374bff5741 Michael Lawnick 2010-08-11 473 ret = i2c_add_numbered_adapter(&priv->adap); 9fce894d03a98e Peter Rosin 2017-05-15 474 if (ret < 0) { 8d4d159f25a79b Peter Rosin 2017-04-03 475 dev_err(&parent->dev, 8d4d159f25a79b Peter Rosin 2017-04-03 476 "failed to add mux-adapter %u as bus %u (error=%d)\n", 8d4d159f25a79b Peter Rosin 2017-04-03 477 chan_id, force_nr, ret); 9fce894d03a98e Peter Rosin 2017-05-15 478 goto err_free_priv; 9fce894d03a98e Peter Rosin 2017-05-15 479 } 0826374bff5741 Michael Lawnick 2010-08-11 480 } else { 0826374bff5741 Michael Lawnick 2010-08-11 481 ret = i2c_add_adapter(&priv->adap); 9fce894d03a98e Peter Rosin 2017-05-15 482 if (ret < 0) { 8d4d159f25a79b Peter Rosin 2017-04-03 483 dev_err(&parent->dev, 8d4d159f25a79b Peter Rosin 2017-04-03 484 "failed to add mux-adapter %u (error=%d)\n", 8d4d159f25a79b Peter Rosin 2017-04-03 485 chan_id, ret); 9fce894d03a98e Peter Rosin 2017-05-15 486 goto err_free_priv; 0826374bff5741 Michael Lawnick 2010-08-11 487 } 0826374bff5741 Michael Lawnick 2010-08-11 488 } 0826374bff5741 Michael Lawnick 2010-08-11 489 a7ab72390b7706 Peter Rosin 2016-04-20 490 WARN(sysfs_create_link(&priv->adap.dev.kobj, &muxc->dev->kobj, a7ab72390b7706 Peter Rosin 2016-04-20 491 "mux_device"), 51cf3b0e2a72bb Wolfram Sang 2014-11-13 492 "can't create symlink to mux device\n"); 51cf3b0e2a72bb Wolfram Sang 2014-11-13 493 c9449affad2ae0 Gerlando Falauto 2014-11-13 494 snprintf(symlink_name, sizeof(symlink_name), "channel-%u", chan_id); a7ab72390b7706 Peter Rosin 2016-04-20 495 WARN(sysfs_create_link(&muxc->dev->kobj, &priv->adap.dev.kobj, a7ab72390b7706 Peter Rosin 2016-04-20 496 symlink_name), f657c9fe268882 Wolfram Sang 2018-05-21 497 "can't create symlink to channel %u\n", chan_id); 0826374bff5741 Michael Lawnick 2010-08-11 498 dev_info(&parent->dev, "Added multiplexed i2c bus %d\n", 0826374bff5741 Michael Lawnick 2010-08-11 499 i2c_adapter_id(&priv->adap)); 0826374bff5741 Michael Lawnick 2010-08-11 500 a7ab72390b7706 Peter Rosin 2016-04-20 501 muxc->adapter[muxc->num_adapters++] = &priv->adap; a7ab72390b7706 Peter Rosin 2016-04-20 502 return 0; 9fce894d03a98e Peter Rosin 2017-05-15 503 9fce894d03a98e Peter Rosin 2017-05-15 504 err_free_priv: 9fce894d03a98e Peter Rosin 2017-05-15 505 kfree(priv); 9fce894d03a98e Peter Rosin 2017-05-15 @506 return ret; 0826374bff5741 Michael Lawnick 2010-08-11 507 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki