[PATCH v2 06/11] drm/tests: Add test for drm_framebuffer_cleanup()

[Carlos Eduardo Gallo Filho <gcarlos@xxxxxxxxxxx>]

Add a single KUnit test case for the drm_framebuffer_cleanup function.

Signed-off-by: Carlos Eduardo Gallo Filho <gcarlos@xxxxxxxxxxx>
---
v2:
  - Reorder kunit cases alphabetically.
  - Rely on drm_kunit_helper_alloc_device() for mock initialization.
---
 drivers/gpu/drm/tests/drm_framebuffer_test.c | 37 ++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_framebuffer_test.c b/drivers/gpu/drm/tests/drm_framebuffer_test.c
index 7b51862fb0f2..a63f30985f75 100644
--- a/drivers/gpu/drm/tests/drm_framebuffer_test.c
+++ b/drivers/gpu/drm/tests/drm_framebuffer_test.c
@@ -490,8 +490,45 @@ check_src_coords_test_to_desc(const struct drm_framebuffer_check_src_coords_case
 KUNIT_ARRAY_PARAM(check_src_coords, drm_framebuffer_check_src_coords_cases,
 		  check_src_coords_test_to_desc);
 
+static void drm_test_framebuffer_cleanup(struct kunit *test)
+{
+	struct drm_framebuffer_test_priv *priv = test->priv;
+	struct drm_device *dev = &priv->dev;
+	struct list_head *fb_list = &dev->mode_config.fb_list;
+	struct drm_framebuffer fb1 = { .dev = dev };
+	struct drm_framebuffer fb2 = { .dev = dev };
+
+	/* This must result on [fb_list] -> fb1 -> fb2 */
+	list_add_tail(&fb1.head, fb_list);
+	list_add_tail(&fb2.head, fb_list);
+	dev->mode_config.num_fb = 2;
+
+	KUNIT_ASSERT_PTR_EQ(test, fb_list->prev, &fb2.head);
+	KUNIT_ASSERT_PTR_EQ(test, fb_list->next, &fb1.head);
+	KUNIT_ASSERT_PTR_EQ(test, fb1.head.prev, fb_list);
+	KUNIT_ASSERT_PTR_EQ(test, fb1.head.next, &fb2.head);
+	KUNIT_ASSERT_PTR_EQ(test, fb2.head.prev, &fb1.head);
+	KUNIT_ASSERT_PTR_EQ(test, fb2.head.next, fb_list);
+
+	drm_framebuffer_cleanup(&fb1);
+
+	/* Now [fb_list] -> fb2 */
+	KUNIT_ASSERT_PTR_EQ(test, fb_list->prev, &fb2.head);
+	KUNIT_ASSERT_PTR_EQ(test, fb_list->next, &fb2.head);
+	KUNIT_ASSERT_PTR_EQ(test, fb2.head.prev, fb_list);
+	KUNIT_ASSERT_PTR_EQ(test, fb2.head.next, fb_list);
+	KUNIT_ASSERT_EQ(test, dev->mode_config.num_fb, 1);
+
+	drm_framebuffer_cleanup(&fb2);
+
+	/* Now fb_list is empty */
+	KUNIT_ASSERT_TRUE(test, list_empty(fb_list));
+	KUNIT_ASSERT_EQ(test, dev->mode_config.num_fb, 0);
+}
+
 static struct kunit_case drm_framebuffer_tests[] = {
 	KUNIT_CASE_PARAM(drm_test_framebuffer_check_src_coords, check_src_coords_gen_params),
+	KUNIT_CASE(drm_test_framebuffer_cleanup),
 	KUNIT_CASE_PARAM(drm_test_framebuffer_create, drm_framebuffer_create_gen_params),
 	KUNIT_CASE(drm_test_framebuffer_modifiers_not_supported),
 	{ }
-- 
2.41.0