02.10.2020 09:08, 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)
> + return -ENOENT;
Could the !fwspec ever be true here as well?
