netdev - Re: [PATCH v2 net-next] net: dsa: Add error path handling in dsa_tree

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Date:   Thu, 30 May 2019 14:52:13 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     linux@...linux.org.uk, f.fainelli@...il.com, hkallweit1@...il.com,
        maxime.chevallier@...tlin.com, olteanv@...il.com,
        thomas.petazzoni@...tlin.com, davem@...emloft.net,
        vivien.didelot@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net: dsa: Add error path handling in
 dsa_tree_setup()

On Thu, May 30, 2019 at 09:09:07AM +0300, Ioana Ciornei wrote:
> In case a call to dsa_tree_setup() fails, an attempt to cleanup is made
> by calling dsa_tree_remove_switch(), which should take care of
> removing/unregistering any resources previously allocated. This does not
> happen because it is conditioned by dst->setup being true, which is set
> only after _all_ setup steps were performed successfully.
> 
> This is especially interesting when the internal MDIO bus is registered
> but afterwards, a port setup fails and the mdiobus_unregister() is never
> called. This leads to a BUG_ON() complaining about the fact that it's
> trying to free an MDIO bus that's still registered.
> 
> Add proper error handling in all functions branching from
> dsa_tree_setup().
> 
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> Reported-by: kernel test robot <rong.a.chen@...el.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew