linux-kernel - Re: [PATCH 1/4] backlight: lm3630a: Initialize backlight

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Date: Tue, 20 Feb 2024 15:41:46 +0000
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
	phone-devel@...r.kernel.org, Lee Jones <lee@...nel.org>,
	Jingoo Han <jingoohan1@...il.com>, Helge Deller <deller@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"G.Shark Jeong" <gshark.jeong@...il.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maximilian Weigand <mweigand@...igand.net>,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 1/4] backlight: lm3630a: Initialize backlight_properties
 on init

On Tue, Feb 20, 2024 at 03:07:54PM +0100, Konrad Dybcio wrote:
> On 20.02.2024 00:11, Luca Weiss wrote:
> > The backlight_properties struct should be initialized to zero before
> > using, otherwise there will be some random values in the struct.
> >
> > Fixes: 0c2a665a648e ("backlight: add Backlight driver for lm3630 chip")
> > Signed-off-by: Luca Weiss <luca@...tu.xyz>
> > ---
> >  drivers/video/backlight/lm3630a_bl.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
> > index a3412c936ca2..8e275275b808 100644
> > --- a/drivers/video/backlight/lm3630a_bl.c
> > +++ b/drivers/video/backlight/lm3630a_bl.c
> > @@ -343,6 +343,7 @@ static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
> >  	struct backlight_properties props;
> >  	const char *label;
> >
> > +	memset(&props, 0, sizeof(struct backlight_properties));
>
> You can zero-initialize it instead

I don't object to either approach but memset() dominates backlight
implementations currently.


Daniel.