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iommu/exynos: fix device leak on of_xlate()

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

Note that commit 1a26044954 ("iommu/exynos: add missing put_device()
call in exynos_iommu_of_xlate()") fixed the leak in a couple of error
paths, but the reference is still leaking on success.

Fixes: aa759fd376 ("iommu/exynos: Add callback for initializing devices from device tree")
Cc: stable@vger.kernel.org	# 4.2: 1a26044954
Cc: Yu Kuai <yukuai3@huawei.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Johan Hovold
2025-10-20 06:53:07 +02:00
committed by Joerg Roedel
parent 6a3908ce56
commit 05913cc43c
1 changed files with 3 additions and 6 deletions
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9
drivers/iommu/exynos-iommu.c
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@@ -1446,17 +1446,14 @@ static int exynos_iommu_of_xlate(struct device *dev,
return -ENODEV;
data = platform_get_drvdata(sysmmu);
if (!data) {
put_device(&sysmmu->dev);
put_device(&sysmmu->dev);
if (!data)
return -ENODEV;
}
if (!owner) {
owner = kzalloc(sizeof(*owner), GFP_KERNEL);
if (!owner) {
put_device(&sysmmu->dev);
if (!owner)
return -ENOMEM;
}
INIT_LIST_HEAD(&owner->controllers);
mutex_init(&owner->rpm_lock);