linux-kernel - Re: [PATCH v2 20/28] net: wan: Add framer framework support

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Message-ID: <20230801123201.25dee219@bootlin.com>
Date:   Tue, 1 Aug 2023 12:32:01 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 20/28] net: wan: Add framer framework support

On Tue, 1 Aug 2023 11:56:12 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > +int framer_pm_runtime_get(struct framer *framer)
> > +{
> > +	int ret;
> > +
> > +	if (!framer)
> > +		return 0;  
> 
> Can framer be a NULL pointer? This sort of test often covers up
> bugs. So either let it dereference the NULL pointer and opps, or
> return -EINVAL.
> 

Well, in the current usage, it cannot be a NULL pointer.
I will simply remove the check (every where it is present) and
dereference the pointer instead of returning -EINVAL.

Regards,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com