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

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Message-ID: <84d6431f-bb55-4224-a4a5-45d7036f1e38@lunn.ch>
Date: Tue, 1 Aug 2023 11:56:12 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Herve Codina <herve.codina@...tlin.com>
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

> +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.

       Andrew