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iommu/mediatek-v1: fix device leak on probe_device()

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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: b17336c55d ("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>
This commit is contained in:
Johan Hovold
2025-10-20 06:53:12 +02:00
committed by Greg Kroah-Hartman
parent 83a8e18f30
commit e7bcedf59b
1 changed files with 2 additions and 0 deletions
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2
drivers/iommu/mtk_iommu_v1.c
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@@ -420,6 +420,8 @@ static int mtk_iommu_v1_create_mapping(struct device *dev, struct of_phandle_arg
return -EINVAL;
dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
put_device(&m4updev->dev);
}
ret = iommu_fwspec_add_ids(dev, args->args, 1);