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Wysocki" , Rob Herring , Brian Norris Subject: [PATCH v2 1/3] drivers: base: Don't match devices with NULL of_node/fwnode/etc Date: Wed, 11 Dec 2024 16:31:39 -0800 Message-ID: <20241212003201.2098123-2-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241212003201.2098123-1-briannorris@chromium.org> References: <20241212003201.2098123-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 of_find_device_by_node(), bus_find_device_by_of_node(), bus_find_device_by_fwnode(), ..., all produce arbitrary results when provided with a NULL of_node, fwnode, ACPI handle, etc. This is counterintuitive, and the source of a few bugs, such as the one fixed by commit 5c8418cf4025 ("PCI/pwrctrl: Unregister platform device only if one actually exists"). It's hard to imagine a good reason that these device_match_*() APIs should return 'true' for a NULL argument. Augment these to return 0 (false). Signed-off-by: Brian Norris Reviewed-by: Rob Herring (Arm) Acked-by: Rafael J. Wysocki --- Changes in v2: * Add Rob's Reviewed-by drivers/base/core.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 94865c9d8adc..2b7b13fc36d7 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -5246,13 +5246,13 @@ EXPORT_SYMBOL_GPL(device_match_name); int device_match_of_node(struct device *dev, const void *np) { - return dev->of_node == np; + return np && dev->of_node == np; } EXPORT_SYMBOL_GPL(device_match_of_node); int device_match_fwnode(struct device *dev, const void *fwnode) { - return dev_fwnode(dev) == fwnode; + return fwnode && dev_fwnode(dev) == fwnode; } EXPORT_SYMBOL_GPL(device_match_fwnode); @@ -5264,13 +5264,13 @@ EXPORT_SYMBOL_GPL(device_match_devt); int device_match_acpi_dev(struct device *dev, const void *adev) { - return ACPI_COMPANION(dev) == adev; + return adev && ACPI_COMPANION(dev) == adev; } EXPORT_SYMBOL(device_match_acpi_dev); int device_match_acpi_handle(struct device *dev, const void *handle) { - return ACPI_HANDLE(dev) == handle; 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Wed, 11 Dec 2024 16:32:11 -0800 (PST) From: Brian Norris To: Greg Kroah-Hartman Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, kunit-dev@googlegroups.com, Maxime Ripard , David Gow , Rae Moar , linux-kselftest@vger.kernel.org, "Rafael J. Wysocki" , Rob Herring , Brian Norris Subject: [PATCH v2 2/3] drivers: base: test: Enable device model tests with KUNIT_ALL_TESTS Date: Wed, 11 Dec 2024 16:31:40 -0800 Message-ID: <20241212003201.2098123-3-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241212003201.2098123-1-briannorris@chromium.org> References: <20241212003201.2098123-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Per commit bebe94b53eb7 ("drivers: base: default KUNIT_* fragments to KUNIT_ALL_TESTS"), it seems like we should default to KUNIT_ALL_TESTS. This enables these platform_device tests for common configurations, such as with: ./tools/testing/kunit/kunit.py run Signed-off-by: Brian Norris --- (no changes since v1) drivers/base/test/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/base/test/Kconfig b/drivers/base/test/Kconfig index 5c7fac80611c..2756870615cc 100644 --- a/drivers/base/test/Kconfig +++ b/drivers/base/test/Kconfig @@ -12,6 +12,7 @@ config TEST_ASYNC_DRIVER_PROBE config DM_KUNIT_TEST tristate "KUnit Tests for the device model" if !KUNIT_ALL_TESTS depends on KUNIT + default KUNIT_ALL_TESTS config DRIVER_PE_KUNIT_TEST tristate "KUnit Tests for property entry API" if !KUNIT_ALL_TESTS From patchwork Thu Dec 12 00:31:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Norris X-Patchwork-Id: 850630 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 938EB2AF16 for ; 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Wed, 11 Dec 2024 16:32:12 -0800 (PST) Received: from localhost ([2a00:79e0:2e14:7:b1a5:9c72:5742:89e0]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-216338fee40sm75395405ad.94.2024.12.11.16.32.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Dec 2024 16:32:12 -0800 (PST) From: Brian Norris To: Greg Kroah-Hartman Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, kunit-dev@googlegroups.com, Maxime Ripard , David Gow , Rae Moar , linux-kselftest@vger.kernel.org, "Rafael J. Wysocki" , Rob Herring , Brian Norris Subject: [PATCH v2 3/3] drivers: base: test: Add ...find_device_by...(... NULL) tests Date: Wed, 11 Dec 2024 16:31:41 -0800 Message-ID: <20241212003201.2098123-4-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241212003201.2098123-1-briannorris@chromium.org> References: <20241212003201.2098123-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We recently updated these device_match*() (and therefore, various *find_device_by*()) functions to return a consistent 'false' value when trying to match a NULL handle. Add tests for this. This provides regression-testing coverage for the sorts of bugs that underly commit 5c8418cf4025 ("PCI/pwrctrl: Unregister platform device only if one actually exists"). Signed-off-by: Brian Norris --- Changes in v2: * Keep "devm" and "match" tests in separate suites drivers/base/test/platform-device-test.c | 42 +++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-) diff --git a/drivers/base/test/platform-device-test.c b/drivers/base/test/platform-device-test.c index ea05b8785743..c8d4b0a385f2 100644 --- a/drivers/base/test/platform-device-test.c +++ b/drivers/base/test/platform-device-test.c @@ -3,6 +3,8 @@ #include #include +#include +#include #include #define DEVICE_NAME "test" @@ -217,7 +219,45 @@ static struct kunit_suite platform_device_devm_test_suite = { .test_cases = platform_device_devm_tests, }; -kunit_test_suite(platform_device_devm_test_suite); +static void platform_device_find_by_null_test(struct kunit *test) +{ + struct platform_device *pdev; + int ret; + + pdev = platform_device_alloc(DEVICE_NAME, PLATFORM_DEVID_NONE); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev); + + ret = platform_device_add(pdev); + KUNIT_ASSERT_EQ(test, ret, 0); + + KUNIT_EXPECT_PTR_EQ(test, of_find_device_by_node(NULL), NULL); + + KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_of_node(&platform_bus_type, NULL), NULL); + KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_fwnode(&platform_bus_type, NULL), NULL); + KUNIT_EXPECT_PTR_EQ(test, bus_find_device_by_acpi_dev(&platform_bus_type, NULL), NULL); + + KUNIT_EXPECT_FALSE(test, device_match_of_node(&pdev->dev, NULL)); + KUNIT_EXPECT_FALSE(test, device_match_fwnode(&pdev->dev, NULL)); + KUNIT_EXPECT_FALSE(test, device_match_acpi_dev(&pdev->dev, NULL)); + KUNIT_EXPECT_FALSE(test, device_match_acpi_handle(&pdev->dev, NULL)); + + platform_device_unregister(pdev); +} + +static struct kunit_case platform_device_match_tests[] = { + KUNIT_CASE(platform_device_find_by_null_test), + {} +}; + +static struct kunit_suite platform_device_match_test_suite = { + .name = "platform-device-match", + .test_cases = platform_device_match_tests, +}; + +kunit_test_suites( + &platform_device_devm_test_suite, + &platform_device_match_test_suite, +); MODULE_DESCRIPTION("Test module for platform devices"); MODULE_AUTHOR("Maxime Ripard ");