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);