linux-kernel - Re: [net: PATCH] net: dsa: add missing refcount decrementation

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Message-ID: <CAPv3WKeFudAqSrPbxeFLvs=myo1UDhBo+GPOZ6dGgpwC-eq8eg@mail.gmail.com>
Date:   Wed, 27 Apr 2022 19:38:09 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        vivien.didelot@...il.com, Florian Fainelli <f.fainelli@...il.com>,
        upstream@...ihalf.com
Subject: Re: [net: PATCH] net: dsa: add missing refcount decrementation

śr., 27 kwi 2022 o 19:25 Vladimir Oltean <olteanv@...il.com> napisał(a):
>
> On Mon, Apr 25, 2022 at 11:47:08AM +0200, Marcin Wojtas wrote:
> > After obtaining the "phy-handle" node, decrementing
> > refcount is required. Fix that.
> >
> > Fixes: a20f997010c4 ("net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed")
> > Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
> > ---
> >  net/dsa/port.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/net/dsa/port.c b/net/dsa/port.c
> > index 32d472a82241..cdc56ba11f52 100644
> > --- a/net/dsa/port.c
> > +++ b/net/dsa/port.c
> > @@ -1620,8 +1620,10 @@ int dsa_port_link_register_of(struct dsa_port *dp)
> >                       if (ds->ops->phylink_mac_link_down)
> >                               ds->ops->phylink_mac_link_down(ds, port,
> >                                       MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
> > +                     of_node_put(phy_np);
> >                       return dsa_port_phylink_register(dp);
> >               }
> > +             of_node_put(phy_np);
> >               return 0;
> >       }
> >
> > --
> > 2.29.0
> >
>
> Thanks for the patch.
>
> commit fc06b2867f4cea543505acfb194c2be4ebf0c7d3
> Author: Miaoqian Lin <linmq006@...il.com>
> Date:   Wed Apr 20 19:04:08 2022 +0800
>
>     net: dsa: Add missing of_node_put() in dsa_port_link_register_of
>
>     The device_node pointer is returned by of_parse_phandle()  with refcount
>     incremented. We should use of_node_put() on it when done.
>     of_node_put() will check for NULL value.
>
>     Fixes: a20f997010c4 ("net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed")
>     Signed-off-by: Miaoqian Lin <linmq006@...il.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>

Great, I'll rebase then and I can drop my patch.

Thanks,
Marcin