linux-kernel - Re: [PATCH v3 1/3] net: phy: mscc: move shared probe code into a helper

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Date:   Mon, 15 Jun 2020 18:11:29 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     heiko@...ech.de
Cc:     kuba@...nel.org, robh+dt@...nel.org, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        christoph.muellner@...obroma-systems.com,
        heiko.stuebner@...obroma-systems.com
Subject: Re: [PATCH v3 1/3] net: phy: mscc: move shared probe code into a
 helper

From: Heiko Stuebner <heiko@...ech.de>
Date: Mon, 15 Jun 2020 16:44:59 +0200

>  static int vsc8584_probe(struct phy_device *phydev)
>  {
>  	struct vsc8531_private *vsc8531;
> +	int rc;
>  	u32 default_mode[4] = {VSC8531_LINK_1000_ACTIVITY,
>  	   VSC8531_LINK_100_ACTIVITY, VSC8531_LINK_ACTIVITY,
>  	   VSC8531_DUPLEX_COLLISION};
> @@ -2005,32 +2015,24 @@ static int vsc8584_probe(struct phy_device *phydev)
>  		return -ENOTSUPP;
>  	}
>  
> -	vsc8531 = devm_kzalloc(&phydev->mdio.dev, sizeof(*vsc8531), GFP_KERNEL);
> -	if (!vsc8531)
> -		return -ENOMEM;

Because you removed this devm_kzalloc() code, vsc8531 is never initialized.

> +	return devm_phy_package_join(&phydev->mdio.dev, phydev,
> +				     vsc8531->base_addr, 0);

But it is still dereferenced here.

Did the compiler really not warn you about this when you test built
these changes?