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SubjectRe: [PATCH v2 2/3] iommu/tegra-smmu: Rework .probe_device and .attach_dev
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30.09.2020 03:30, Nicolin Chen пишет:
> static int tegra_smmu_attach_dev(struct iommu_domain *domain,
> struct device *dev)
> {
> + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
> struct tegra_smmu *smmu = dev_iommu_priv_get(dev);
> struct tegra_smmu_as *as = to_smmu_as(domain);
> - struct device_node *np = dev->of_node;
> - struct of_phandle_args args;
> unsigned int index = 0;
> int err = 0;
>
> - while (!of_parse_phandle_with_args(np, "iommus", "#iommu-cells", index,
> - &args)) {
> - unsigned int swgroup = args.args[0];
> -
> - if (args.np != smmu->dev->of_node) {
> - of_node_put(args.np);
> - continue;
> - }
> -
> - of_node_put(args.np);
> + if (!fwspec || fwspec->ops != &tegra_smmu_ops)
> + return -ENOENT;

s/&tegra_smmu_ops/smmu->iommu.ops/

Secondly, is it even possible that fwspec could be NULL here or that
fwspec->ops != smmu->ops?

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