I think I figured out the another bug which manifests itself when low_latency is set to 0
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Hi Alan,
Admittedly there always was a bug when tty_insert_flip_string runs out of memory when low_latency is set to 0,
After your change I now
need a callback when tty_insert_flip_string has room for more data & I currently I don't get one,
This is needed to execute the code in hso_unthrottle_tasklet i.e. I do flow control by not submitting
read urbs to the modem when TTY_THROTTLED is set. The only way I can see for getting this callback without modifying the tty layer is setting the TTY_THROTTLED bit if tty_insert_flip_string returns 0, I hope this works.
I'm personally a bit frightened that we may have more bugs/problems that will manifest by setting low_latency to 0, especially for the guys here running diagnostics over the serial port requiring very high throughput.
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