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iommu/rockchip: prevent iommus dead loop when two masters share one IOMMU

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commit 62e062a29ad5133f67c20b333ba0a952a99161ae upstream.

When two masters share an IOMMU, calling ops->of_xlate during
the second master's driver init may overwrite iommu->domain set
by the first. This causes the check if (iommu->domain == domain)
in rk_iommu_attach_device() to fail, resulting in the same
iommu->node being added twice to &rk_domain->iommus, which can
lead to an infinite loop in subsequent &rk_domain->iommus operations.

Cc: <stable@vger.kernel.org>
Fixes: 25c2325575 ("iommu/rockchip: Add missing set_platform_dma_ops callback")
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20250623020018.584802-1-xxm@rock-chips.com
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Simon Xue
2025-06-23 10:00:18 +08:00
committed by Greg Kroah-Hartman
parent 6052862ba3
commit 73d43c2150
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/rockchip-iommu.c
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@@ -1177,7 +1177,6 @@ static int rk_iommu_of_xlate(struct device *dev,
iommu_dev = of_find_device_by_node(args->np);
data->iommu = platform_get_drvdata(iommu_dev);
data->iommu->domain = &rk_identity_domain;
dev_iommu_priv_set(dev, data);
platform_device_put(iommu_dev);
@@ -1217,6 +1216,8 @@ static int rk_iommu_probe(struct platform_device *pdev)
if (!iommu)
return -ENOMEM;
iommu->domain = &rk_identity_domain;
platform_set_drvdata(pdev, iommu);
iommu->dev = dev;
iommu->num_mmu = 0;