Re: serial8250: bogus low_latency destabilizes kernel, need sanitycheck

[One Thousand Gnomes]

> Maybe we should unset the low_latency flag as soon as DMA fails?  There
> are two flags, one is state->uart_port->flags and the other is
> port->low_latency.  I guess we need to unset both.

Well low latency and DMA are pretty much exclusive in the real world so
probably DMA ports shouldn't allow low_latency to be set at all in DMA
mode.

Alan
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