[PATCH 2/4] iommu/mediatek: Add error path for loop of mm_dts_parse

[Yong Wu via iommu <iommu@lists.linux-foundation.org>]

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.

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 | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 0f6ec4a4d9d4..523bf59264e1 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -1065,12 +1065,12 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
 
 		plarbdev = of_find_device_by_node(larbnode);
 		if (!plarbdev) {
-			of_node_put(larbnode);
-			return -ENODEV;
+			ret = -ENODEV;
+			goto err_larbnode_put;
 		}
 		if (!plarbdev->dev.driver) {
-			of_node_put(larbnode);
-			return -EPROBE_DEFER;
+			ret = -EPROBE_DEFER;
+			goto err_larbnode_put;
 		}
 		data->larb_imu[id].dev = &plarbdev->dev;
 
@@ -1101,9 +1101,20 @@ static int mtk_iommu_mm_dts_parse(struct device *dev, struct component_match **m
 			       DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
 	if (!link) {
 		dev_err(dev, "Unable to link %s.\n", dev_name(data->smicomm_dev));
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_larbnode_put;
 	}
 	return 0;
+
+err_larbnode_put:
+	while (i--) {
+		larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i);
+		if (larbnode && of_device_is_available(larbnode)) {
+			of_node_put(larbnode);
+			of_node_put(larbnode);
+		}
+	}
+	return ret;
 }
 
 static int mtk_iommu_probe(struct platform_device *pdev)
-- 
2.18.0

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