netdev - Re: [net-next] net: phy: Check for read errors in SIOCGMIIREG

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Message-ID: <b151952b-5536-4fb0-a908-d8ee4834f302@gmail.com>
Date: Tue, 3 Sep 2024 11:06:20 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Niklas Söderlund
 <niklas.soderlund+renesas@...natech.se>, Andrew Lunn <andrew@...n.ch>,
 Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org
Subject: Re: [net-next] net: phy: Check for read errors in SIOCGMIIREG

On 9/3/24 10:15, Niklas Söderlund wrote:
> When reading registers from the PHY using the SIOCGMIIREG IOCTL any
> errors returned from either mdiobus_read() or mdiobus_c45_read() are
> ignored, and parts of the returned error is passed as the register value
> back to user-space.
> 
> For example, if mdiobus_c45_read() is used with a bus that do not
> implement the read_c45() callback -EOPNOTSUPP is returned. This is
> however directly stored in mii_data->val_out and returned as the
> registers content. As val_out is a u16 the error code is truncated and
> returned as a plausible register value.
> 
> Fix this by first checking the return value for errors before returning
> it as the register content.
> 
> Before this patch,
> 
>      # phytool read eth0/0:1/0
>      0xffa1
> 
> After this change,
> 
>      $ phytool read eth0/0:1/0
>      error: phy_read (-95)
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>

Thanks for fixing that!
-- 
Florian