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Subject[PATCH v3 4/7] iommu/mediatek: Add error path for loop of mm_dts_parse
Date
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.

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;"
That means set data->larb_imu[id].dev before the error path.
then we don't need "platform_device_put(plarbdev)" again while
probe_defer case. All depend on "put_device" in 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>
---
drivers/iommu/mtk_iommu.c | 42 ++++++++++++++++++++++++++++-----------
1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 3da8c6252c2c..aa0973bafde1 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -1057,8 +1057,10 @@ 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);
@@ -1071,14 +1073,16 @@ 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);
@@ -1086,8 +1090,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m

/* Get smi-(sub)-common dev from the last larb. */
smi_subcomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0);
- if (!smi_subcomm_node)
- return -EINVAL;
+ if (!smi_subcomm_node) {
+ ret = -EINVAL;
+ goto err_larbdev_put;
+ }

/*
* It may have two level smi-common. the node is smi-sub-common if it
@@ -1101,8 +1107,10 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m

pcommdev = of_find_device_by_node(smicomm_node);
of_node_put(smicomm_node);
- if (!pcommdev)
- return -EINVAL;
+ if (!pcommdev) {
+ ret = -EINVAL;
+ goto err_larbdev_put;
+ }
data->smicomm_dev = &pcommdev->dev;

link = device_link_add(data->smicomm_dev, dev,
@@ -1110,9 +1118,19 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
platform_device_put(pcommdev);
if (!link) {
dev_err(dev, "Unable to link %s.\n", dev_name(data->smicomm_dev));
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_larbdev_put;
}
return 0;
+
+err_larbdev_put:
+ /* id may be not linear mapping, loop whole the array */
+ for (i = 0; i < MTK_LARB_NR_MAX; 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
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