iommu/sun50i: fix device leak on of_xlate()

commit f916109bf53864605d10bf6f4215afa023a80406 upstream.

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

Fixes: 4100b8c229b3 ("iommu: Add Allwinner H6 IOMMU driver")
Cc: stable@vger.kernel.org	# 5.8
Cc: Maxime Ripard <mripard@kernel.org>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index f31f66b123666190e8fff3a0a1ec3bf2a754d1e6..1a77bd46b458125908b7e8238701cf5a9c2d7eea 100644 (file)
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -767,6 +767,8 @@ static int sun50i_iommu_of_xlate(struct device *dev,
 
        dev_iommu_priv_set(dev, platform_get_drvdata(iommu_pdev));
 
+       put_device(&iommu_pdev->dev);
+
        return iommu_fwspec_add_ids(dev, &id, 1);
 }