Re: re your change to the low_latency flag in the hso driver in 2.6.29-rc1

I remember removing the low_latency flag to 0 once & if I recall correctly performance 
was severely impacted & there may have been other problems which I don't recall.

The modern buffering and old buffering are rather different so that
shouldn't be a problem.

Now tty_insert_flip_string can return 0 bytes leading to an infinite loop if tty buffers are full,
as write_length_remaining never goes to zero as I am dependent on the line
discipline being called from tty_flip_buffer_push to set TTY_THROTTLED by calling flush_to_ldisc

In all cases tty_insert_flip_string may return 0 for other reasons (eg
out of memory).

checking if curr_write_len=0 from tty_insert_flip_string might fix the problem
Please look at put_rxbuf_data carefully, there might be other gremlins. The serial port
is supposed to be high performance this fix will impact this

Will do, but it should have no impact at all on throughput - in fact it
ought to improve it. You can't call tty_flip_buffer_push() from an
IRQ handler with tty->low_latency set anyway...

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