linux-kernel - Re: [net-next PATCH v6 1/3] net: phy: extend PHY package API to support multiple global address

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Message-ID: <ZXnRlERUGhwxKJxi@shell.armlinux.org.uk>
Date:   Wed, 13 Dec 2023 15:45:24 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        David Epping <david.epping@...singlinkelectronics.com>,
        Harini Katakam <harini.katakam@....com>,
        Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v6 1/3] net: phy: extend PHY package API to
 support multiple global address

On Wed, Dec 13, 2023 at 11:57:28AM +0100, Christian Marangi wrote:
> -static inline int phy_package_read(struct phy_device *phydev, u32 regnum)
> +static inline int phy_package_read(struct phy_device *phydev,
> +				   unsigned int addr_offset, u32 regnum)
>  {
>  	struct phy_package_shared *shared = phydev->shared;
> +	int addr = shared->base_addr + addr_offset;
>  
> -	if (!shared)
> +	if (addr >= PHY_MAX_ADDR)
>  		return -EIO;

If we're going to check the address, I think we should check it
properly, which means also checking whether it's become negative.

Alternatively, we could consider making "addr" and "base_addr"
unsigned types, since they should never be negative. However,
that probably should be done as a separate patch before this one.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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