linux-kernel - [PATCH 4/5] leds: led-test: Provide test for registration with a name that is too long

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Message-ID: <20250514162807.708010-4-lee@kernel.org>
Date: Wed, 14 May 2025 17:27:55 +0100
From: Lee Jones <lee@...nel.org>
To: lee@...nel.org,
	bettyzhou@...gle.com,
	ynaffit@...gle.com,
	tkjos@...gle.com,
	jacek.anaszewski@...il.com,
	Pavel Machek <pavel@...nel.org>,
	linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] leds: led-test: Provide test for registration with a name that is too long

Insist on legacy (non-DT) registration and provide a default_label and
devicename that when concatenated together results in a device name that
is unacceptably long.

Signed-off-by: Lee Jones <lee@...nel.org>
---
 drivers/leds/led-test.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/leds/led-test.c b/drivers/leds/led-test.c
index 3d71c7a23e21..741dc0269515 100644
--- a/drivers/leds/led-test.c
+++ b/drivers/leds/led-test.c
@@ -123,11 +123,28 @@ static void led_test_class_init_data_missing_devicename(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, ret, -EINVAL);
 }
 
+static void led_test_class_init_data_name_too_long(struct kunit *test)
+{
+	struct led_test_ddata *ddata = test->priv;
+	struct led_classdev *cdev = &ddata->cdev;
+	struct device *dev = ddata->dev;
+	int ret;
+
+	struct led_init_data init_data = {
+		.devicename = "led-test-devicename-very-long-names-fail",
+		.default_label = "led-test-label-also-very-long-names-fail",
+	};
+
+	ret = led_classdev_register_ext(dev, cdev, &init_data);
+	KUNIT_EXPECT_EQ(test, ret, -E2BIG);
+}
+
 static struct kunit_case led_test_cases[] = {
 	KUNIT_CASE(led_test_class_register),
 	KUNIT_CASE(led_test_class_add_lookup_and_get),
 	KUNIT_CASE(led_test_class_init_data_missing_default_label),
 	KUNIT_CASE(led_test_class_init_data_missing_devicename),
+	KUNIT_CASE(led_test_class_init_data_name_too_long),
 	{ }
 };
 
-- 
2.49.0.1045.g170613ef41-goog