[PATCH v3 2/3] drm/tests: managed: Extract device initialization into test init

[Michał Winiarski <michal.winiarski@xxxxxxxxx>]

It simplifies the process of extending the test suite with additional
test cases without unnecessary duplication.

Signed-off-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
---
 drivers/gpu/drm/tests/drm_managed_test.c | 51 +++++++++++++++++-------
 1 file changed, 36 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_managed_test.c b/drivers/gpu/drm/tests/drm_managed_test.c
index 1652dca11d30c..15bd2474440b5 100644
--- a/drivers/gpu/drm/tests/drm_managed_test.c
+++ b/drivers/gpu/drm/tests/drm_managed_test.c
@@ -12,6 +12,7 @@
 #define TEST_TIMEOUT_MS	100
 
 struct managed_test_priv {
+	struct drm_device *drm;
 	bool action_done;
 	wait_queue_head_t action_wq;
 };
@@ -24,35 +25,54 @@ static void drm_action(struct drm_device *drm, void *ptr)
 	wake_up_interruptible(&priv->action_wq);
 }
 
+/*
+ * The test verifies that the release action is called automatically when the
+ * device is released.
+ */
 static void drm_test_managed_run_action(struct kunit *test)
+{
+	struct managed_test_priv *priv = test->priv;
+	int ret;
+
+	ret = drmm_add_action_or_reset(priv->drm, drm_action, priv);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	ret = drm_dev_register(priv->drm, 0);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	drm_dev_unregister(priv->drm);
+	drm_kunit_helper_free_device(test, priv->drm->dev);
+
+	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
+					       msecs_to_jiffies(TEST_TIMEOUT_MS));
+	KUNIT_EXPECT_GT_MSG(test, ret, 0, "Release action was not called");
+}
+
+static int drm_managed_test_init(struct kunit *test)
 {
 	struct managed_test_priv *priv;
-	struct drm_device *drm;
 	struct device *dev;
-	int ret;
 
 	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
-	init_waitqueue_head(&priv->action_wq);
 
 	dev = drm_kunit_helper_alloc_device(test);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
 
-	drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*drm), 0, DRIVER_MODESET);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, drm);
+	/*
+	 * DRM device can't be embedded in priv, since priv->action_done needs
+	 * to remain allocated beyond both parent device and drm_device
+	 * lifetime.
+	 */
+	priv->drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*priv->drm), 0,
+							DRIVER_MODESET);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);
 
-	ret = drmm_add_action_or_reset(drm, drm_action, priv);
-	KUNIT_EXPECT_EQ(test, ret, 0);
-
-	ret = drm_dev_register(drm, 0);
-	KUNIT_ASSERT_EQ(test, ret, 0);
+	init_waitqueue_head(&priv->action_wq);
 
-	drm_dev_unregister(drm);
-	drm_kunit_helper_free_device(test, dev);
+	test->priv = priv;
 
-	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
-					       msecs_to_jiffies(TEST_TIMEOUT_MS));
-	KUNIT_EXPECT_GT(test, ret, 0);
+	return 0;
 }
 
 static struct kunit_case drm_managed_tests[] = {
@@ -62,6 +82,7 @@ static struct kunit_case drm_managed_tests[] = {
 
 static struct kunit_suite drm_managed_test_suite = {
 	.name = "drm-test-managed",
+	.init = drm_managed_test_init,
 	.test_cases = drm_managed_tests
 };
 
-- 
2.43.0