linux-kernel - Re: [PATCH net] net: dsa: fix spurious error message when unoffloaded port leaves bridge

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Date:   Tue, 12 Oct 2021 14:36:30 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Alvin Šipraga <alvin@...s.dk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: fix spurious error message when
 unoffloaded port leaves bridge

On Tue, Oct 12, 2021 at 01:27:31PM +0200, Alvin Šipraga wrote:
> From: Alvin Šipraga <alsi@...g-olufsen.dk>
> 
> Flip the sign of a return value check, thereby suppressing the following
> spurious error:
> 
>   port 2 failed to notify DSA_NOTIFIER_BRIDGE_LEAVE: -EOPNOTSUPP
> 
> ... which is emitted when removing an unoffloaded DSA switch port from a
> bridge.
> 
> Fixes: d371b7c92d19 ("net: dsa: Unset vlan_filtering when ports leave the bridge")
> Signed-off-by: Alvin Šipraga <alsi@...g-olufsen.dk>
> ---
>  net/dsa/switch.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/dsa/switch.c b/net/dsa/switch.c
> index 1c797ec8e2c2..6466d0539af9 100644
> --- a/net/dsa/switch.c
> +++ b/net/dsa/switch.c
> @@ -168,7 +168,7 @@ static int dsa_switch_bridge_leave(struct dsa_switch *ds,
>  		if (extack._msg)
>  			dev_err(ds->dev, "port %d: %s\n", info->port,
>  				extack._msg);
> -		if (err && err != EOPNOTSUPP)
> +		if (err && err != -EOPNOTSUPP)
>  			return err;
>  	}
>  
> -- 
> 2.32.0
> 

Ouch, good catch.

Reviewed-by: Vladimir Oltean <olteanv@...il.com>