Re: [RFC][PATCH 7/7] serial, 8250: Mostly avoid wakeups from underport->lock

[Alan Cox]

> > Also I think it's probably buggy - sending the x_char is forward progress
> > so probably needs to cause a wakeup.
> 
> Could you explain that more, its not actually connecting with any
> neurons..

The tty output queue is the ring buffer + one byte (x_char). It's
effectively two priority queues one of which is 1 byte long and high
priority, the other of which is low priority.

> > So for the moment NAK, but worthy of figuring out how to do it right
> 
> OK, will try and see if I can poke at it a level upwards.. 

I think that is the right magic - and also means all the embedded
consoles might be poked the right way.
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