Jonathan Woithe [off-list ref] :
[...]

to mainline (in which case I'll keep watching out for it)?  Or is the
out-of-tree workaround mentioned above considered to be the long term
fix for those who encounter the problem?

It's a workaround. Nothing less, nothing more.

IIRC the ga311 irq signaling was a bit special. I almost surely broke
it at some point.

-- 
Ueimor