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iommu/exynos: Ensure that SYSMMU is added only once to its master device
This patch prepares Exynos IOMMU driver for deferred probing support. Once it gets added, of_xlate() callback might be called more than once for the same SYSMMU controller and master device (for example it happens when masters device driver fails with EPROBE_DEFER). This patch adds a check, which ensures that SYSMMU controller is added to its master device (owner) only once. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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1 changed files with 5 additions and 1 deletions
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@ -1253,7 +1253,7 @@ static int exynos_iommu_of_xlate(struct device *dev,
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{
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struct exynos_iommu_owner *owner = dev->archdata.iommu;
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struct platform_device *sysmmu = of_find_device_by_node(spec->np);
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struct sysmmu_drvdata *data;
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struct sysmmu_drvdata *data, *entry;
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if (!sysmmu)
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return -ENODEV;
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@ -1272,6 +1272,10 @@ static int exynos_iommu_of_xlate(struct device *dev,
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dev->archdata.iommu = owner;
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}
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list_for_each_entry(entry, &owner->controllers, owner_node)
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if (entry == data)
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return 0;
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list_add_tail(&data->owner_node, &owner->controllers);
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data->master = dev;
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