netdev - Re: [PATCH net] net: dsa: Do not leave DSA master with NULL netdev

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Message-Id: <20200506.173234.92268086246049661.davem@davemloft.net>
Date:   Wed, 06 May 2020 17:32:34 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     netdev@...r.kernel.org, allen.pais@...cle.com, andrew@...n.ch,
        vivien.didelot@...il.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: Do not leave DSA master with NULL
 netdev_ops

From: Florian Fainelli <f.fainelli@...il.com>
Date: Mon,  4 May 2020 13:18:06 -0700

> When ndo_get_phys_port_name() for the CPU port was added we introduced
> an early check for when the DSA master network device in
> dsa_master_ndo_setup() already implements ndo_get_phys_port_name(). When
> we perform the teardown operation in dsa_master_ndo_teardown() we would
> not be checking that cpu_dp->orig_ndo_ops was successfully allocated and
> non-NULL initialized.
> 
> With network device drivers such as virtio_net, this leads to a NPD as
> soon as the DSA switch hanging off of it gets torn down because we are
> now assigning the virtio_net device's netdev_ops a NULL pointer.
> 
> Fixes: da7b9e9b00d4 ("net: dsa: Add ndo_get_phys_port_name() for CPU port")
> Reported-by: Allen Pais <allen.pais@...cle.com>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Applied and queued up for -stable, thanks Florian.