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Date:   Wed, 6 May 2020 14:24:14 -0700
From:   Florian Fainelli <>
To:     Vivien Didelot <>
        Andrew Lunn <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        open list <>
Subject: Re: [RFC net] net: dsa: Add missing reference counting

On 5/5/2020 2:23 PM, Vivien Didelot wrote:
> 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 <>
Andrew, Vladimir, any thoughts on that?

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