In commit

  fe89277c9ceb0 ("iommu/vt-d: Fix intel iommu iotlb sync hardlockup and retry")

Fixes tag

  Fixes: 8a1d82462540 ("iommu/vt-d: Multiple descriptors per  qi_submit_sync()")

has these problem(s):

  - Subject does not match target commit subject
    Just use
	git log -1 --format='Fixes: %h ("%s")'