[PATCH] iommu: Fix NULL pointer deref when io_page_fault tracepoint fires

[Markus Elfring]

…
> Fix this by adding logic to the tracepoint to safely propagate NULL.

* How do you think about to add any tags (like “Fixes” and “Cc”) accordingly?

* Would a summary phrase like “Prevent null pointer dereference for a tracepoint”
  be a bit nicer?


Regards,
Markus