On Wed, Sep 30, 2020 at 08:10:35AM +0300, Dmitry Osipenko wrote: > 30.09.2020 03:30, Nicolin Chen пишет: > > void tegra_smmu_remove(struct tegra_smmu *smmu) > > { > > + bus_set_iommu(&platform_bus_type, NULL); > > Why only platform_bus? Is this really needed at all? I see qcom_iommu.c file set to NULL in remove(), Probably should have added pci_bus_type too though. Or are you sure that there's no need at all?