> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Wednesday, August 9, 2023 10:44 PM
>
> As generic_single_device_group() requires it. Otherwise it crashes:
>
> generic_single_device_group+0x24/0x88
> __iommu_probe_device+0xe8/0x444
> iommu_probe_device+0x1c/0x54
> of_iommu_configure+0x10c/0x200
> of_dma_configure_id+0x1e0/0x3b4
> platform_dma_configure+0x30/0x78
> really_probe+0x70/0x2b4
> __driver_probe_device+0x78/0x12c
> driver_probe_device+0x3c/0x160
> __driver_attach+0x9c/0x1ac
> bus_for_each_dev+0x74/0xd4
> driver_attach+0x24/0x30
> bus_add_driver+0xe4/0x1e8
> driver_register+0x60/0x128
> __platform_driver_register+0x28/0x34
> hantro_driver_init+0x20/0x1000 [hantro_vpu]
> do_one_initcall+0x74/0x2f0
> do_init_module+0x58/0x1ec
> load_module+0x1a20/0x1c64
> init_module_from_file+0x84/0xc0
> idempotent_init_module+0x180/0x250
> __arm64_sys_finit_module+0x64/0xa0
> invoke_syscall+0x48/0x114
> el0_svc_common.constprop.0+0xec/0x10c
> do_el0_svc+0x38/0xa4
> el0_svc+0x40/0xac
> el0t_64_sync_handler+0xc0/0xc4
> el0t_64_sync+0x190/0x194
>
> Fixes: 5dd59857af60 ("iommu: Add generic_single_device_group()")
> Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Closes: https://lore.kernel.org/all/e5e75222-13a9-ee01-0c25-
> 8311b622fe0d@xxxxxxxxxxx/
> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
