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Wysocki" , Maxime Ripard , linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Rob Herring , David Gow , Rae Moar , linux-acpi@vger.kernel.org, Brian Norris Subject: [PATCH 1/4] drivers: base: Don't match devices with NULL of_node/fwnode/etc Date: Tue, 10 Dec 2024 11:13:30 -0800 Message-ID: <20241210191353.533801-2-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241210191353.533801-1-briannorris@chromium.org> References: <20241210191353.533801-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-acpi@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 --- 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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Tue, 10 Dec 2024 11:14:11 -0800 (PST) From: Brian Norris To: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" , Maxime Ripard , linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Rob Herring , David Gow , Rae Moar , linux-acpi@vger.kernel.org, Brian Norris Subject: [PATCH 2/4] drivers: base: test: Enable device model tests with KUNIT_ALL_TESTS Date: Tue, 10 Dec 2024 11:13:31 -0800 Message-ID: <20241210191353.533801-3-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241210191353.533801-1-briannorris@chromium.org> References: <20241210191353.533801-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-acpi@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 --- 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 Tue Dec 10 19:13:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brian Norris X-Patchwork-Id: 848911 Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) (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 47CDE2046BE for ; 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Wysocki" , Maxime Ripard , linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Rob Herring , David Gow , Rae Moar , linux-acpi@vger.kernel.org, Brian Norris Subject: [PATCH 3/4] drivers: base: test: Drop "devm" from platform-device-test names Date: Tue, 10 Dec 2024 11:13:32 -0800 Message-ID: <20241210191353.533801-4-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241210191353.533801-1-briannorris@chromium.org> References: <20241210191353.533801-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This is a reasonably-helpful base for generic platform_device tests, and I'd like to add more tests that aren't specifically about "devm" functions. Drop the devm namings for the suite, for clarity. Signed-off-by: Brian Norris --- drivers/base/test/platform-device-test.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/base/test/platform-device-test.c b/drivers/base/test/platform-device-test.c index ea05b8785743..fd871bb9e143 100644 --- a/drivers/base/test/platform-device-test.c +++ b/drivers/base/test/platform-device-test.c @@ -15,7 +15,7 @@ struct test_priv { struct device *dev; }; -static int platform_device_devm_init(struct kunit *test) +static int platform_device_init(struct kunit *test) { struct test_priv *priv; @@ -203,7 +203,7 @@ static void probed_platform_device_devm_register_get_unregister_with_devm_test(s platform_driver_unregister(&fake_driver); } -static struct kunit_case platform_device_devm_tests[] = { +static struct kunit_case platform_device_tests[] = { KUNIT_CASE(platform_device_devm_register_unregister_test), KUNIT_CASE(platform_device_devm_register_get_unregister_with_devm_test), KUNIT_CASE(probed_platform_device_devm_register_unregister_test), @@ -211,13 +211,13 @@ static struct kunit_case platform_device_devm_tests[] = { {} }; 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Tue, 10 Dec 2024 11:14:15 -0800 (PST) Received: from localhost ([2a00:79e0:2e14:7:cf2b:44dd:668c:5818]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-21659e7b7eesm33797255ad.9.2024.12.10.11.14.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Dec 2024 11:14:15 -0800 (PST) From: Brian Norris To: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" , Maxime Ripard , linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, Rob Herring , David Gow , Rae Moar , linux-acpi@vger.kernel.org, Brian Norris Subject: [PATCH 4/4] drivers: base: test: Add ...find_device_by...(... NULL) tests Date: Tue, 10 Dec 2024 11:13:33 -0800 Message-ID: <20241210191353.533801-5-briannorris@chromium.org> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog In-Reply-To: <20241210191353.533801-1-briannorris@chromium.org> References: <20241210191353.533801-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-acpi@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 --- drivers/base/test/platform-device-test.c | 28 ++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/base/test/platform-device-test.c b/drivers/base/test/platform-device-test.c index fd871bb9e143..f9d1a269a479 100644 --- a/drivers/base/test/platform-device-test.c +++ b/drivers/base/test/platform-device-test.c @@ -2,7 +2,9 @@ #include +#include #include +#include #include #define DEVICE_NAME "test" @@ -203,11 +205,37 @@ static void probed_platform_device_devm_register_get_unregister_with_devm_test(s platform_driver_unregister(&fake_driver); } +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_tests[] = { KUNIT_CASE(platform_device_devm_register_unregister_test), KUNIT_CASE(platform_device_devm_register_get_unregister_with_devm_test), KUNIT_CASE(probed_platform_device_devm_register_unregister_test), KUNIT_CASE(probed_platform_device_devm_register_get_unregister_with_devm_test), + KUNIT_CASE(platform_device_find_by_null_test), {} };