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Tue, 10 Feb 2026 11:10:51 -0800 (PST) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-436309ed238sm35212929f8f.19.2026.02.10.11.10.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Feb 2026 11:10:50 -0800 (PST) Date: Tue, 10 Feb 2026 22:10:47 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Bartosz Golaszewski , Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , Greg Kroah-Hartman , Dmitry Torokhov , Arnd Bergmann , Hans de Goede , Ilpo =?iso-8859-1?Q?J=E4rvinen?= Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] gpio: swnode: restore the swnode-name-against-chip-label matching Message-ID: <202602110128.BInRI9un-lkp@intel.com> Precedence: bulk X-Mailing-List: stable@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: <20260210094806.38146-1-bartosz.golaszewski@oss.qualcomm.com> Hi Bartosz, kernel test robot noticed the following build warnings: https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Bartosz-Golaszewski/gpio-swnode-restore-the-swnode-name-against-chip-label-matching/20260210-175012 base: https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next patch link: https://lore.kernel.org/r/20260210094806.38146-1-bartosz.golaszewski%40oss.qualcomm.com patch subject: [PATCH] gpio: swnode: restore the swnode-name-against-chip-label matching config: nios2-randconfig-r071-20260210 (https://download.01.org/0day-ci/archive/20260211/202602110128.BInRI9un-lkp@intel.com/config) compiler: nios2-linux-gcc (GCC) 8.5.0 smatch version: v0.5.0-8994-gd50c5a4c 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/202602110128.BInRI9un-lkp@intel.com/ smatch warnings: drivers/gpio/gpiolib-swnode.c:62 swnode_get_gpio_device() error: we previously assumed 'gdev_node' could be null (see line 32) vim +/gdev_node +62 drivers/gpio/gpiolib-swnode.c b7b56e64a345e7 Bartosz Golaszewski 2023-09-27 26 static struct gpio_device *swnode_get_gpio_device(struct fwnode_handle *fwnode) e7f9ff5dc90c38 Dmitry Torokhov 2022-11-11 27 { b7b56e64a345e7 Bartosz Golaszewski 2023-09-27 28 const struct software_node *gdev_node; b7b56e64a345e7 Bartosz Golaszewski 2023-09-27 29 struct gpio_device *gdev; e7f9ff5dc90c38 Dmitry Torokhov 2022-11-11 30 b7b56e64a345e7 Bartosz Golaszewski 2023-09-27 31 gdev_node = to_software_node(fwnode); 6774a66d0e103d Bartosz Golaszewski 2025-12-15 @32 if (!gdev_node) 216c1204757190 Bartosz Golaszewski 2025-11-20 33 goto fwnode_lookup; gdev_node is NULL e7f9ff5dc90c38 Dmitry Torokhov 2022-11-11 34 9d50f95bc0d5df Charles Keepax 2024-04-16 35 /* 9d50f95bc0d5df Charles Keepax 2024-04-16 36 * Check for a special node that identifies undefined GPIOs, this is 9d50f95bc0d5df Charles Keepax 2024-04-16 37 * primarily used as a key for internal chip selects in SPI bindings. 9d50f95bc0d5df Charles Keepax 2024-04-16 38 */ 9d50f95bc0d5df Charles Keepax 2024-04-16 39 if (IS_ENABLED(CONFIG_GPIO_SWNODE_UNDEFINED) && 6774a66d0e103d Bartosz Golaszewski 2025-12-15 40 gdev_node == &swnode_gpio_undefined) 9d50f95bc0d5df Charles Keepax 2024-04-16 41 return ERR_PTR(-ENOENT); 9d50f95bc0d5df Charles Keepax 2024-04-16 42 216c1204757190 Bartosz Golaszewski 2025-11-20 43 fwnode_lookup: e5d527be7e6984 Bartosz Golaszewski 2025-11-03 44 gdev = gpio_device_find_by_fwnode(fwnode); 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 45 if (!gdev) 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 46 /* 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 47 * FIXME: We shouldn't need to compare the GPIO controller's 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 48 * label against the software node that is supposedly attached 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 49 * to it. However there are currently GPIO users that - knowing 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 50 * the expected label of the GPIO chip whose pins they want to 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 51 * control - set up dummy software nodes named after those GPIO 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 52 * controllers, which aren't actually attached to them. In this 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 53 * case gpio_device_find_by_fwnode() will fail as no device on 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 54 * the GPIO bus is actually associated with the fwnode we're 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 55 * looking for. 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 56 * 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 57 * As a fallback: continue checking the label if we have no 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 58 * match. However, the situation described above is an abuse 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 59 * of the software node API and should be phased out and the 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 60 * following line - eventually removed. 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 61 */ 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 @62 gdev = gpio_device_find_by_label(gdev_node->name); ^^^^^^^^^^^^^^^ Unchecked dereference 4a61b0b6de0480 Bartosz Golaszewski 2026-02-10 63 b7b56e64a345e7 Bartosz Golaszewski 2023-09-27 64 return gdev ?: ERR_PTR(-EPROBE_DEFER); e7f9ff5dc90c38 Dmitry Torokhov 2022-11-11 65 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki