linux-kernel - Re: [PATCH net v1 1/2] net: dsa: lantiq_gswip: Fix start index in gswip_port

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Date:   Wed, 18 May 2022 14:45:55 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, Hauke Mehrtens <hauke@...ke-m.de>
Subject: Re: [PATCH net v1 1/2] net: dsa: lantiq_gswip: Fix start index in
 gswip_port_fdb()

Hi Martin,

On Tue, May 17, 2022 at 09:40:14PM +0200, Martin Blumenstingl wrote:
> The first N entries in priv->vlans are reserved for managing ports which
> are not part of a bridge. Use priv->hw_info->max_ports to consistently
> access per-bridge entries at index 7. Starting at
> priv->hw_info->cpu_port (6) is harmless in this case because
> priv->vlan[6].bridge is always NULL so the comparison result is always
> false (which results in this entry being skipped).
> 
> Fixes: 58c59ef9e930c4 ("net: dsa: lantiq: Add Forwarding Database access")
> Acked-by: Hauke Mehrtens <hauke@...ke-m.de>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---

The patch, as well as other improvements you might want to bring to the gswip driver
(we have more streamlined support in DSA now for FDB isolation, see ds->fdb_isolation)
is appreciated.

But I don't think that a code cleanup patch that makes no functional
difference, and isn't otherwise needed by other backported patches,
should be sent to the "net" tree, and be backported to "stable" later?