diff mbox series

[v4,01/10] drm/tests: hdmi: handle empty modes in find_preferred_mode()

Message ID 20241122-hdmi-mode-valid-v4-1-2fee4a83ab79@linaro.org (mailing list archive)
State New
Headers show
Series drm/display: hdmi: add drm_hdmi_connector_mode_valid() | expand

Commit Message

Dmitry Baryshkov Nov. 22, 2024, 9:12 a.m. UTC 
If the connector->modes list is empty, then list_first_entry() returns a
bogus entry. Change that to use list_first_entry_or_null().

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index 294773342e710dc56772f839c2db9c2e487bbc1e..1e77689af6549f162eb3026c7bd2bbd59516ed98 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -46,7 +46,7 @@  static struct drm_display_mode *find_preferred_mode(struct drm_connector *connec
 	struct drm_display_mode *mode, *preferred;
 
 	mutex_lock(&drm->mode_config.mutex);
-	preferred = list_first_entry(&connector->modes, struct drm_display_mode, head);
+	preferred = list_first_entry_or_null(&connector->modes, struct drm_display_mode, head);
 	list_for_each_entry(mode, &connector->modes, head)
 		if (mode->type & DRM_MODE_TYPE_PREFERRED)
 			preferred = mode;