From: Yong Wu <yong.wu@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Will Deacon <will@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>, <iommu@lists.linux.dev>,
<linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, Yong Wu <yong.wu@mediatek.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
<mingyuan.ma@mediatek.com>, <yf.wang@mediatek.com>,
<libo.kang@mediatek.com>, <chengci.xu@mediatek.com>,
<youlin.pei@mediatek.com>, <anan.sun@mediatek.com>,
<xueqi.zhang@mediatek.com>, Guenter Roeck <groeck@chromium.org>,
Dan Carpenter <dan.carpenter@oracle.com>
Subject: [PATCH v6 3/6] iommu/mediatek: Add error path for loop of mm_dts_parse
Date: Tue, 20 Sep 2022 14:37:30 +0800 [thread overview]
Message-ID: <20220920063733.21770-4-yong.wu@mediatek.com> (raw)
In-Reply-To: <20220920063733.21770-1-yong.wu@mediatek.com>
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 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@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
drivers/iommu/mtk_iommu.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 83b279432406..97b721006a47 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -1053,8 +1053,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
u32 id;
larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
- if (!larbnode)
- return -EINVAL;
+ if (!larbnode) {
+ ret = -EINVAL;
+ goto err_larbdev_put;
+ }
if (!of_device_is_available(larbnode)) {
of_node_put(larbnode);
@@ -1067,14 +1069,16 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
plarbdev = of_find_device_by_node(larbnode);
of_node_put(larbnode);
- if (!plarbdev)
- return -ENODEV;
+ if (!plarbdev) {
+ ret = -ENODEV;
+ goto err_larbdev_put;
+ }
+ data->larb_imu[id].dev = &plarbdev->dev;
if (!plarbdev->dev.driver) {
- platform_device_put(plarbdev);
- return -EPROBE_DEFER;
+ ret = -EPROBE_DEFER;
+ goto err_larbdev_put;
}
- data->larb_imu[id].dev = &plarbdev->dev;
component_match_add(dev, match, component_compare_dev, &plarbdev->dev);
platform_device_put(plarbdev);
@@ -1109,6 +1113,15 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
return -EINVAL;
}
return 0;
+
+err_larbdev_put:
+ /* id may be not linear mapping, loop whole the array */
+ for (i = MTK_LARB_NR_MAX - 1; i >= 0; i++) {
+ if (!data->larb_imu[i].dev)
+ continue;
+ put_device(data->larb_imu[i].dev);
+ }
+ return ret;
}
static int mtk_iommu_probe(struct platform_device *pdev)
--
2.18.0
next prev parent reply other threads:[~2022-09-20 6:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-20 6:37 [PATCH v6 0/6] iommu/mediatek: Improve safety from invalid dts input Yong Wu
2022-09-20 6:37 ` [PATCH v6 1/6] iommu/mediatek: Add platform_device_put for recovering the device refcnt Yong Wu
2022-09-20 6:37 ` [PATCH v6 2/6] iommu/mediatek: Use component_match_add Yong Wu
2022-09-20 6:37 ` Yong Wu [this message]
2022-09-20 6:37 ` [PATCH v6 4/6] iommu/mediatek: Validate number of phandles associated with "mediatek,larbs" Yong Wu
2022-09-20 6:37 ` [PATCH v6 5/6] iommu/mediatek: Improve safety for mediatek,smi property in larb nodes Yong Wu
2022-09-20 6:37 ` [PATCH v6 6/6] iommu/mediatek: Remove unused "mapping" member from mtk_iommu_data Yong Wu
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