Regression fix not progressing towards mainline/stable

[Thorsten Leemhuis]

Hi everyone, I noticed a regression fix that afaics lingers in the
thesofproject's git repo instead of progressing towards the stable trees
and wondered what's up here.

I'm talking about about the fix "ASoC: SOF: intel: hda: Clean up link
DMA for IPC3 during stop" for this ticket:
https://github.com/thesofproject/linux/issues/4455

Two more tickets about it:
https://github.com/thesofproject/linux/issues/4482
https://bugzilla.kernel.org/show_bug.cgi?id=217673

It seems the fix is ready and reviewed for two weeks now, but not even
in -next by now. That's not how it should be for regression fixes, as
per https://docs.kernel.org/process/handling-regressions.html it ideally
should be in -stable soon or already. Is this a mistake, am I missing
something, or is there a good reason for this?

Ciao, Thorsten