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iommu/tegra: fix device leak on probe_device()

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commit c08934a61201db8f1d1c66fcc63fb2eb526b656d upstream.

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

Note that commit 9826e393e4 ("iommu/tegra-smmu: Fix missing
put_device() call in tegra_smmu_find") fixed the leak in an error path,
but the reference is still leaking on success.

Fixes: 8918465163 ("memory: Add NVIDIA Tegra memory controller support")
Cc: stable@vger.kernel.org	# 3.19: 9826e393e4
Cc: Miaoqian Lin <linmq006@gmail.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Thierry Reding <treding@nvidia.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>
This commit is contained in:
Johan Hovold
2025-10-20 06:53:18 +02:00
committed by Greg Kroah-Hartman
parent 0314de9c84
commit 3627e0e773
1 changed files with 2 additions and 3 deletions
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5
drivers/iommu/tegra-smmu.c
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@@ -804,10 +804,9 @@ static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
return NULL;
mc = platform_get_drvdata(pdev);
if (!mc) {
put_device(&pdev->dev);
put_device(&pdev->dev);
if (!mc)
return NULL;
}
return mc->smmu;
}