This is a note to let you know that I've just added the patch titled
drm/tests: hdmi: handle empty modes in find_preferred_mode()
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-tests-hdmi-handle-empty-modes-in-find_preferred_.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d37b43708698f3ad99bb74c7d66be81e2291fc27
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Sat Nov 30 03:52:26 2024 +0200
drm/tests: hdmi: handle empty modes in find_preferred_mode()
[ Upstream commit d3314efd6ebf335a3682b1d6b1b81cdab3d8254a ]
If the connector->modes list is empty, then list_first_entry() returns a
bogus entry. Change that to use list_first_entry_or_null().
Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20241130-hdmi-mode-valid-v5-1-742644ec3b1f@xxxxxxxxxx
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 294773342e710..1e77689af6549 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;
