linux-kernel - Re: [RFC net] net: dsa: Add missing reference counting

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Message-ID: <20200505172302.GB1170406@t480s.localdomain>
Date:   Tue, 5 May 2020 17:23:02 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, olteanv@...il.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net] net: dsa: Add missing reference counting

On Tue,  5 May 2020 14:02:53 -0700, Florian Fainelli <f.fainelli@...il.com> 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 <f.fainelli@...il.com>

Reviewed-by: Vivien Didelot <vivien.didelot@...il.com>