Make sure to drop the reference taken to the iommu platform device when looking up its driver data during of_xlate().

Fixes: 0df4fabe208d ("iommu/mediatek: Add mt8173 IOMMU driver") Cc: stable@vger.kernel.org # 4.6 Cc: Yong Wu yong.wu@mediatek.com Acked-by: Robin Murphy robin.murphy@arm.com Signed-off-by: Johan Hovold johan@kernel.org --- drivers/iommu/mtk_iommu.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 0e0285348d2b..8d8e85186188 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -974,6 +974,8 @@ static int mtk_iommu_of_xlate(struct device *dev, return -EINVAL;

dev_iommu_priv_set(dev, platform_get_drvdata(m4updev)); + + put_device(&m4updev->dev); }

return iommu_fwspec_add_ids(dev, args->args, 1);