linux-kernel - [PATCH AUTOSEL 6.12 07/31] drm/tests: hdmi: handle empty modes in find_preferred

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Message-Id: <20250126145448.930220-7-sashal@kernel.org>
Date: Sun, 26 Jan 2025 09:54:23 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Maxime Ripard <mripard@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	maarten.lankhorst@...ux.intel.com,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dave.stevenson@...pberrypi.com,
	victor.liu@....com,
	ruanjinjie@...wei.com,
	quic_jjohnson@...cinc.com,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.12 07/31] drm/tests: hdmi: handle empty modes in find_preferred_mode()

From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

[ 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@...nel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241130-hdmi-mode-valid-v5-1-742644ec3b1f@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
-- 
2.39.5