iommu: Make sysfs robust for non-API groups

Groups created by VFIO backends outside the core IOMMU API should never
be passed directly into the API itself, however they still expose their
standard sysfs attributes, so we can still stumble across them that way.
Take care to consider those cases before jumping into our normal
assumptions of a fully-initialised core API group.

Fixes: 3f6634d997db ("iommu: Use right way to retrieve iommu_ops")
Reported-by: Jan Stancek <[email protected]>
Tested-by: Jan Stancek <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Signed-off-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/86ada41986988511a8424e84746dfe9ba7f87573.1651667683.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <[email protected]>

0 files changed, 0 insertions, 0 deletions