6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold johan@kernel.org
commit c77ad28bfee0df9cbc719eb5adc9864462cfb65b upstream.
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 Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Signed-off-by: Joerg Roedel joerg.roedel@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/mtk_iommu_v1.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -420,6 +420,8 @@ static int mtk_iommu_v1_create_mapping(s return -EINVAL;
dev_iommu_priv_set(dev, platform_get_drvdata(m4updev)); + + put_device(&m4updev->dev); }
ret = iommu_fwspec_add_ids(dev, args->args, 1);