linux-kernel - Re: [PATCH v2 2/5] iommu/mediatek: Add error path for loop of mm_dts

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Message-ID: <561adc680c9af8e8813baf698f2f6ba67ce046e9.camel@mediatek.com>
Date:   Thu, 23 Jun 2022 10:12:31 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        <iommu@...ts.linux-foundation.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <mingyuan.ma@...iatek.com>, <yf.wang@...iatek.com>,
        <libo.kang@...iatek.com>, <chengci.xu@...iatek.com>,
        <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>,
        <xueqi.zhang@...iatek.com>, Guenter Roeck <groeck@...omium.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v2 2/5] iommu/mediatek: Add error path for loop of
 mm_dts_parse

On Thu, 2022-06-16 at 15:49 +0200, Matthias Brugger wrote:
> 
> On 16/06/2022 07:42, Yong Wu wrote:
> > The mtk_iommu_mm_dts_parse will parse the smi larbs nodes. if the
> > i+1
> > larb is parsed fail(return -EINVAL), we should of_node_put for the
> > 0..i
> > larbs. In the fail path, one of_node_put matches with
> > of_parse_phandle in
> > it.
> > 
> > Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with
> > the MM TYPE")
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >   drivers/iommu/mtk_iommu.c | 21 ++++++++++++++++-----
> >   1 file changed, 16 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> > index 3b2489e8a6dd..ab24078938bf 100644
> > --- a/drivers/iommu/mtk_iommu.c
> > +++ b/drivers/iommu/mtk_iommu.c
> > @@ -1071,12 +1071,12 @@ static int mtk_iommu_mm_dts_parse(struct
> > device *dev, struct component_match **m
> >   
> 
> Don't we need to call the goto also on error case of:
> 
> larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);

Thanks very much.

exactly right. I will add in next version.

> Regards,
> Matthias