Hi Robin,

On 15/08/2022 17:20, Robin Murphy wrote:

Move the bus setup to iommu_device_register(). This should allow
bus_iommu_probe() to be correctly replayed for multiple IOMMU instances,
and leaves bus_set_iommu() as a glorified no-op to be cleaned up next.

At this point we can also handle cleanup better than just rolling back
the most-recently-touched bus upon failure - which may release devices
owned by other already-registered instances, and still leave devices on
other buses with dangling pointers to the failed instance. Now it's easy
to clean up the exact footprint of a given instance, no more, no less.

Since this change, I have noticed that the DRM driver on Tegra20 is 
failing to probe and I am seeing ...

  tegra-gr2d 54140000.gr2d: failed to attach to domain: -19
  drm drm: failed to initialize 54140000.gr2d: -19

Bisect points to this change and reverting it fixes it. Let me know if 
you have any thoughts.

Cheers
Jon

-- 
nvpublic

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