linux-kernel - Re: [PATCH] net: tc35815: Fix phydev supported/advertising mask

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Date:   Mon, 27 Apr 2020 11:10:39 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Anthony Felice <tony.felice@...esys.com>
Cc:     Akshay Bhat <akshay.bhat@...esys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Rob Herring <robh@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: tc35815: Fix phydev supported/advertising mask

On 27.04.2020 04:00, Anthony Felice wrote:
> Commit 3c1bcc8614db ("net: ethernet: Convert phydev advertize and
> supported from u32 to link mode") updated ethernet drivers to use a
> linkmode bitmap. It mistakenly dropped a bitwise negation in the
> tc35815 ethernet driver on a bitmask to set the supported/advertising
> flags.
> 
> Found by Anthony via code inspection, not tested as I do not have the
> required hardware.
> 
> Fixes: 3c1bcc8614db ("net: ethernet: Convert phydev advertize and supported from u32 to link mode")
> Signed-off-by: Anthony Felice <tony.felice@...esys.com>
> Reviewed-by: Akshay Bhat <akshay.bhat@...esys.com>
> ---
>  drivers/net/ethernet/toshiba/tc35815.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/toshiba/tc35815.c b/drivers/net/ethernet/toshiba/tc35815.c
> index 3fd43d30b20d..a1066fbb93b5 100644
> --- a/drivers/net/ethernet/toshiba/tc35815.c
> +++ b/drivers/net/ethernet/toshiba/tc35815.c
> @@ -643,7 +643,7 @@ static int tc_mii_probe(struct net_device *dev)
>  		linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, mask);
>  		linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, mask);
>  	}
> -	linkmode_and(phydev->supported, phydev->supported, mask);
> +	linkmode_andnot(phydev->supported, phydev->supported, mask);
>  	linkmode_copy(phydev->advertising, phydev->supported);
>  
>  	lp->link = 0;
> 
> base-commit: 55b2af1c23eb12663015998079992f79fdfa56c8
> 
Reviewed-by: Heiner Kallweit <hkallweit1@...il.com>

The complete structure of this code is quite weird (e.g. using module
parameters to force a link mode), but the driver seems to be too old
that anybody would spend effort on refactoring it.