6.6-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit b3f1ee18280363ef17f82b564fc379ceba9ec86f upstream.
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 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.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -959,6 +959,8 @@ static int mtk_iommu_of_xlate(struct 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);