From: Daniel Thompson <daniel.thompson@linaro.org>
Date: Wed, 25 Jul 2018 07:38:30 +0000 (+0100)
Subject: backlight: pwm_bl: Fix uninitialized variable
X-Git-Tag: v4.19-rc1~80^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=633786736ed53a53b8d0a630cc3ff57381027081;p=linux.git

backlight: pwm_bl: Fix uninitialized variable

Currently, if the DT does not define num-interpolated-steps then
num_steps is undefined and the interpolation code will deploy randomly.
Fix with a simple initialize to zero.

Fixes: 573fe6d1c25c ("backlight: pwm_bl: Linear interpolation between brightness-levels")
Reported-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 9ee4c1b735b2..bdfcc0a71db1 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -250,7 +250,7 @@ static int pwm_backlight_parse_dt(struct device *dev,
 	struct device_node *node = dev->of_node;
 	unsigned int num_levels = 0;
 	unsigned int levels_count;
-	unsigned int num_steps;
+	unsigned int num_steps = 0;
 	struct property *prop;
 	unsigned int *table;
 	int length;