Re: Serial buffer memory leak

> tty_buffer_flush() needs to wait for buf.flushpending to clear.

Not 100% sure it does as its no different to events really occuring with
a possible timing. Trivial to wait_event on the read queue for this
however and definitely worth doing to be sure.

Should probably make the flushpending an atomic bit op to avoid taking
and retaking the lock.

Alan
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