commit 5f89468e2f060031cd89fd4287298e0eaf246bf6 upstream. (Backported as different form due to absence of below patch series https://lore.kernel.org/linux-iommu/20210301074436.919889-1-hch@lst.de/)
What stable kernel(s) is this for?
Hmm. I sent this with "--in-reply-to" option of git send-email with your e-mail's message-id but it didn't work well. This is for linux-5.12.y tree.
And did you send the same patch twice?
No. Unfortunately, they're different due to swiotlb patches. I backported the patch to each kernel versions respectively.
Best Regards, Chanho Park