Please pick 0c8e9c148e29 and da33e87bd2bf for linux-6.15.y

Hi Greg, Sasha,

Please could you pick these commits for linux-6.15.y:

0c8e9c148e29 ("iommu: Avoid introducing more races") da33e87bd2bf ("iommu: Handle yet another race around registration")

which in hindsight should ideally have been merged as fixes during the cycle, but for various reasons were queued as 6.16 material at the time.

Thanks, Robin.