From: Robin Murphy <robin.murphy@arm.com>
Sent: Wednesday, July 6, 2022 1:08 AM

Currently we rely on registering all our instances before initially
allowing any .probe_device calls via bus_set_iommu(). In preparation for
phasing out the latter, make sure we won't inadvertently return success
for a device associated with a known but not yet registered instance,
otherwise we'll run straight into iommu_group_get_for_dev() trying to
use NULL ops.

That also highlights an issue with intel_iommu_get_resv_regions() taking
dmar_global_lock from within a section where intel_iommu_init() already
holds it, which already exists via probe_acpi_namespace_devices() when
an ANDD device is probed, but gets more obvious with the upcoming change
to iommu_device_register(). Since they are both read locks it manages
not to deadlock in practice, so I'm leaving it here for someone with
more confidence to tackle a larger rework of the locking.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>

Reviewed-by: Kevin Tian <kevin.tian@intel.com>

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