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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 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), {} };