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SubjectRe: [PATCH v4 2/3] iommu/tegra-smmu: Rework tegra_smmu_probe_device()
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02.10.2020 09:08, Nicolin Chen пишет:
> static int tegra_smmu_of_xlate(struct device *dev,
> struct of_phandle_args *args)
> {
> + struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
> + struct tegra_mc *mc = platform_get_drvdata(iommu_pdev);
> u32 id = args->args[0];
>
> + of_node_put(args->np);
> +
> + if (!mc || !mc->smmu)
> + return -EPROBE_DEFER;

platform_get_drvdata(NULL) will crash.

> + dev_iommu_priv_set(dev, mc->smmu);

I think put_device(mc->dev) is missed here, doesn't it?

Why sun50i-iommu driver doesn't have this error-checking? Is it really
needed at all?

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