linux-kernel - Re: [PATCH] [media] media: mtk-mdp: fix reference count on old device tree

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Date:   Fri, 12 Jul 2019 15:23:37 +0800
From:   houlong wei <houlong.wei@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Minghsiu Tsai (蔡明修) 
        <Minghsiu.Tsai@...iatek.com>,
        Andrew-CT Chen (陳智迪) 
        <Andrew-CT.Chen@...iatek.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "djkurtz@...omium.org" <djkurtz@...omium.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] [media] media: mtk-mdp: fix reference count on old
 device tree



On Mon, 2019-07-08 at 17:06 +0800, Matthias Brugger wrote:
> 
> On 21/06/2019 13:32, Matthias Brugger wrote:
> > of_get_next_child() increments the reference count of the returning
> > device_node. Decrement it in the check if we are using the old or the
> > new DTB.
> > 
> > Fixes: ba1f1f70c2c0 ("[media] media: mtk-mdp: Fix mdp device tree")
> > Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> 
> Any comments on that?
> 

Hi Matthias,
Thanks for fixing the bug. Sorry to reply late~

Acked-by: Houlong Wei <houlong.wei@...iatek.com>


> > ---
> >  drivers/media/platform/mtk-mdp/mtk_mdp_core.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> > index bbb24fb95b95..bafe53c5d54a 100644
> > --- a/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> > +++ b/drivers/media/platform/mtk-mdp/mtk_mdp_core.c
> > @@ -118,7 +118,9 @@ static int mtk_mdp_probe(struct platform_device *pdev)
> >  	mutex_init(&mdp->vpulock);
> >  
> >  	/* Old dts had the components as child nodes */
> > -	if (of_get_next_child(dev->of_node, NULL)) {
> > +	parent = of_get_next_child(dev->of_node, NULL);
> > +	if (parent) {
> > +		of_node_put(parent);
> >  		parent = dev->of_node;
> >  		dev_warn(dev, "device tree is out of date\n");
> >  	} else {
> >