Re: [Bug #14388] keyboard under X with 2.6.31

[Alan Cox]

> And no, I'm not sure my patch helps. I'd have expected 
> 'tty_buffer_flush()' to be something very rare, for example. But I also 
> didn't really check if we may do it some other way.

It is rare for most applications

> But I _am_ sure that it makes the code a whole lot more straightforward. 
> Bits that say "we're busy flushing" suddenly actually act that way, and 
> pointers that say "this is the head of the buffers" also act that wy.

The more I look the more I think a mutex is the right answer. It also
provides us with a "stop feeding me" lock for ldisc changes and tty close
down bits.
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