> Hrm...  How badly is pl2303 broken?  I actually use that sucker, so if
> it needs help - count me in.

2303 is pretty good (in fact by usb serial standards outstanding). It has
all the internal locking needed for now and right down to killing
lock_kernel entirely outside of open/close (which is going to hit
everything).

Only fixme I have tagged for it is

- if you set an unsupported baud rate it reports it set rather than the
one you got

Which is a trivial mend for someone who has suitable docs (its marked
FIXME: at the right spot)
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