linux-kernel - Re: [PATCH v5 3/6] iommu/mediatek: Add error path for loop of mm_dts

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Message-ID: <276a4a37-a98d-c59b-a967-db9f5b220077@collabora.com>
Date:   Mon, 19 Sep 2022 16:20:35 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>
Cc:     Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        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 v5 3/6] iommu/mediatek: Add error path for loop of
 mm_dts_parse

Il 19/09/22 11:24, Yong Wu ha scritto:
> The mtk_iommu_mm_dts_parse will parse the smi larbs nodes. if the i+1
> larb is parsed fail, we should put_device for the 0..i larbs.

If any v6 will be required... you forgot to update the commit description with
"we should put_device for the i..0 larbs".

> 
> There are two places need to comment:
> 1) The larbid may be not linear mapping, we should loop whole
>     the array in the error path.
> 2) I move this line position: "data->larb_imu[id].dev = &plarbdev->dev;"
>     before "if (!plarbdev->dev.driver)", That means set
>     data->larb_imu[id].dev before the error path. then we don't need
>     "platform_device_put(plarbdev)" again in probe_defer case. All depend
>     on "put_device" of the error path in error cases.
> 
> Fixes: d2e9a1102cfc ("iommu/mediatek: Contain MM IOMMU flow with the MM TYPE")
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

In any case....

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>