From 211b7aac5443d347ff7b6dabf54702b40228cfaf Mon Sep 17 00:00:00 2001
From: "Balasubramaniam, Hari Chand" <hari.chand.balasubramaniam@intel.com>
Date: Tue, 15 Aug 2017 10:05:46 +0800
Subject: [PATCH] drm/i915: Initialize 'data' in intel_dsi_dcs_backlight.c
Git-commit: 211b7aac5443d347ff7b6dabf54702b40228cfaf
Patch-mainline: v4.13-rc7
References: FATE#322643 bsc#1055900
No-fix: d59814a5b4852442e1d03c569a4542f8b08356a7
variable 'data' may be used uninitialized in this function. thus,
'function dcs_get_backlight' will return unwanted value/fail.
Thus, adding NULL initialized to 'data' variable will solve the return
failure happening.
V2: Change commit message to reflect upstream with proper message
Fixes: 90198355b83c ("drm/i915/dsi: Add DCS control for Panel PWM")
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Yetunde Adebisi <yetundex.adebisi@intel.com>
Cc: Deepak M <m.deepak@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Balasubramaniam, Hari Chand <hari.chand.balasubramaniam@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1502762746-191826-1-git-send-email-hari.chand.balasubramaniam@intel.com
(cherry picked from commit d59814a5b4852442e1d03c569a4542f8b08356a7)
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c
@@ -46,7 +46,7 @@ static u32 dcs_get_backlight(struct inte
struct intel_encoder *encoder = connector->encoder;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct mipi_dsi_device *dsi_device;
- u8 data;
+ u8 data = 0;
enum port port;
/* FIXME: Need to take care of 16 bit brightness level */