Re: [PATCH] 8250: option 'force_polling' for buggy IRQs

From: One Thousand Gnomes
Date: Fri Jul 29 2016 - 05:23:51 EST

> Serial consoles are already polled for output. So nothing should
> care until userspace starts, and the full serial driver initializes.

At which point it hangs

> So I suspect either "irqfixup" or "irqpoll" would handle this for you.
> If not I am certain a small tweak to some of that code would work.

irqfixup won't usually help but irqpoll with HZ=1000 ought to, although
it has its own set of problems because not all devices with non shared
IRQ lines take kindly to irqpoll.