drm/i915: Initialize 'data' in intel_dsi_dcs_backlight.c

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)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c b/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c
index 6e09ceb71500ceeedce5836c3772861f47aeda21..150a156f3b1e9a2bff7f32bbf1ed1905eb71ca8b 100644 (file)
--- 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 intel_connector *connector)
        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 */