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Date:   Tue, 5 May 2020 17:23:02 -0400
From:   Vivien Didelot <>
To:     Florian Fainelli <>
        Florian Fainelli <>,
        Andrew Lunn <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        open list <>
Subject: Re: [RFC net] net: dsa: Add missing reference counting

On Tue,  5 May 2020 14:02:53 -0700, Florian Fainelli <> wrote:
> If we are probed through platform_data we would be intentionally
> dropping the reference count on master after dev_to_net_device()
> incremented it. If we are probed through Device Tree,
> of_find_net_device() does not do a dev_hold() at all.
> Ensure that the DSA master device is properly reference counted by
> holding it as soon as the CPU port is successfully initialized and later
> released during dsa_switch_release_ports(). dsa_get_tag_protocol() does
> a short de-reference, so we hold and release the master at that time,
> too.
> Fixes: 83c0afaec7b7 ("net: dsa: Add new binding implementation")
> Signed-off-by: Florian Fainelli <>

Reviewed-by: Vivien Didelot <>

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