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Message-Id: <20230811131600.2380519-1-arnd@kernel.org>
Date: Fri, 11 Aug 2023 15:15:53 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Lee Jones <lee@...nel.org>,
Daniel Thompson <daniel.thompson@...aro.org>,
Jingoo Han <jingoohan1@...il.com>,
Helge Deller <deller@....de>,
Artur Weber <aweber.kernel@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>,
Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] backlight: lp855x: fix unintialized function return
From: Arnd Bergmann <arnd@...db.de>
The function now returns an error code in some cases, but fails to initialize
it in others:
drivers/video/backlight/lp855x_bl.c:252:11: error: variable 'ret' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
else if (lp->mode == REGISTER_BASED)
^~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/video/backlight/lp855x_bl.c:256:9: note: uninitialized use occurs here
return ret;
^~~
drivers/video/backlight/lp855x_bl.c:252:7: note: remove the 'if' if its condition is always true
else if (lp->mode == REGISTER_BASED)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Since this case should not actually happen, return the -EINVAL code.
Fixes: 5145531be5fba ("backlight: lp855x: Catch errors when changing brightness")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
drivers/video/backlight/lp855x_bl.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index 61a7f45bfad84..ea4fa69e49a70 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -252,6 +252,8 @@ static int lp855x_bl_update_status(struct backlight_device *bl)
else if (lp->mode == REGISTER_BASED)
ret = lp855x_write_byte(lp, lp->cfg->reg_brightness,
(u8)brightness);
+ else
+ ret = -EINVAL;
return ret;
}
--
2.39.2
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