Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during probe_device().
Fixes: b17336c55d89 ("iommu/mediatek: add support for mtk iommu generation one HW")
Cc: stable@vger.kernel.org # 4.8
Cc: Honghui Zhang <honghui.zhang@mediatek.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/iommu/mtk_iommu_v1.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 10cc0b1197e8..de9153c0a82f 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -435,6 +435,8 @@ static int mtk_iommu_v1_create_mapping(struct device *dev,
return -EINVAL;
dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
+
+ put_device(&m4updev->dev);
}
ret = iommu_fwspec_add_ids(dev, args->args, 1);
--
2.49.1