[PATCH] iommu/mediatek-v1: Fix an error handling path in mtk_iommu_v1_probe()

[Christophe JAILLET]

A clk, prepared and enabled in mtk_iommu_v1_hw_init(), is not released in
the error handling path of mtk_iommu_v1_probe().

Add the corresponding clk_disable_unprepare(), as already done in the
remove function.

Fixes: b17336c55d89 ("iommu/mediatek: add support for mtk iommu generation one HW")
Signed-off-by: Christophe JAILLET <christophe.jaillet at wanadoo.fr>
---
Another option would be to use devm_clk_get_enabled(). This would save a
few LoC in mtk_iommu_v1_hw_init() and in the remove function.
However, it would change the order of function calls in the remove function
so I leave it as-is.
Let me know if it is fine and if you prefer this alternative.
---
 drivers/iommu/mtk_iommu_v1.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 69682ee068d2..ca581ff1c769 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -683,7 +683,7 @@ static int mtk_iommu_v1_probe(struct platform_device *pdev)
 	ret = iommu_device_sysfs_add(&data->iommu, &pdev->dev, NULL,
 				     dev_name(&pdev->dev));
 	if (ret)
-		return ret;
+		goto out_clk_unprepare;
 
 	ret = iommu_device_register(&data->iommu, &mtk_iommu_v1_ops, dev);
 	if (ret)
@@ -698,6 +698,8 @@ static int mtk_iommu_v1_probe(struct platform_device *pdev)
 	iommu_device_unregister(&data->iommu);
 out_sysfs_remove:
 	iommu_device_sysfs_remove(&data->iommu);
+out_clk_unprepare:
+	clk_disable_unprepare(data->bclk);
 	return ret;
 }
 
-- 
2.34.1