linux-kernel - [PATCH 2/4] backlight: lm3639: Fully initialize backlight

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Message-ID: <20240220153010.76238-3-daniel.thompson@linaro.org>
Date: Tue, 20 Feb 2024 15:30:06 +0000
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Lee Jones <lee.jones@...aro.org>,
	Jingoo Han <jingoohan1@...il.com>
Cc: Daniel Thompson <daniel.thompson@...aro.org>,
	Luca Weiss <luca@...tu.xyz>,
	dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] backlight: lm3639: Fully initialize backlight_properties during probe

props is stack allocated and the fields that are not explcitly set
by the probe function need to be zeroed or we'll get undefined behaviour
(especially so power/blank states)!

Fixes: 0f59858d5119 ("backlight: add new lm3639 backlight driver")
Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
---
 drivers/video/backlight/lm3639_bl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/backlight/lm3639_bl.c b/drivers/video/backlight/lm3639_bl.c
index 5246c171497d6..564f62acd7211 100644
--- a/drivers/video/backlight/lm3639_bl.c
+++ b/drivers/video/backlight/lm3639_bl.c
@@ -338,6 +338,7 @@ static int lm3639_probe(struct i2c_client *client)
 	}
 
 	/* backlight */
+	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.brightness = pdata->init_brt_led;
 	props.max_brightness = pdata->max_brt_led;
-- 
2.43.0