linux-kernel - Re: [PATCH] ata: pata_macio: add of_node

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Message-ID: <CAEExFWsLP0oJVDV1KBENwsFKZ52ygZ18DQp1g1ah4a1ZmxeJLw@mail.gmail.com>
Date:   Wed, 21 Nov 2018 23:33:44 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     sergei.shtylyov@...entembedded.com
Cc:     b.zolnierkie@...sung.com, axboe@...nel.dk,
        linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: pata_macio: add of_node_put()

On Wed, Nov 21, 2018 at 11:31 PM Frank Lee <tiny.windzz@...il.com> wrote:
>
> On Wed, Nov 21, 2018 at 11:24 PM Sergei Shtylyov
> <sergei.shtylyov@...entembedded.com> wrote:
> >
> > Hello!
> >
> > On 11/21/2018 04:04 PM, Yangtao Li wrote:
> >
> > > of_find_node_by_path() acquires a reference to the node
> > > returned by it and that reference needs to be dropped by its caller.
> > > bl_idle_init() doesn't do that, so fix it.
> >
> >    I thought we're inside pata_macio_cable_detect()?
Hi Sergei：

Yeah,this is a typo.
Need me to resend a patch?

Thanks，
Yangtao
> Hi Sergei：
>
> What do you mean?
> Why not release the refcount of root?
>
> Yours,
>     Yangtao
> >
> > > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > > ---
> > >  drivers/ata/pata_macio.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
> > > index 9588e685d994..8cc9c429ad95 100644
> > > --- a/drivers/ata/pata_macio.c
> > > +++ b/drivers/ata/pata_macio.c
> > > @@ -483,6 +483,8 @@ static int pata_macio_cable_detect(struct ata_port *ap)
> > >               struct device_node *root = of_find_node_by_path("/");
> > >               const char *model = of_get_property(root, "model", NULL);
> > >
> > > +             of_node_put(root);
> > > +
> > >               if (cable && !strncmp(cable, "80-", 3)) {
> > >                       /* Some drives fail to detect 80c cable in PowerBook
> > >                        * These machine use proprietary short IDE cable
> >
> > MBR, Sergei