From 623f4fb09164ec1478138e418bc138b16de7a465 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Sun, 12 Jun 2022 15:21:51 +0200
Subject: drm/bridge: tc358775: Fix drm_of_get_data_lanes_count_ep conversion
Git-commit: c750c4ce1ad69d3df68359abce70ee3d0064c97a
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

Initialize dsi_lanes to -1, so that in case the endpoint is missing,
probe would fail as it did before the conversion, instead of depending
on uninitialized variable and thus undefined behavior.

Fixes: 56426faa1492 ("drm/bridge: tc358775: Convert to drm_of_get_data_lanes_count_ep")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
To: dri-devel@lists.freedesktop.org
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220612132152.91052-2-marex@denx.de
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/bridge/tc358775.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
index 5b1fb8e2f9a7..e5d00a6e7880 100644
--- a/drivers/gpu/drm/bridge/tc358775.c
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -529,7 +529,7 @@ static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
 	struct device_node *endpoint;
 	struct device_node *parent;
 	struct device_node *remote;
-	int dsi_lanes;
+	int dsi_lanes = -1;
 
 	/*
 	 * To get the data-lanes of dsi, we need to access the dsi0_out of port1
-- 
2.38.1