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SubjectRe: [PATCH] USB: ftdi_sio: Remove tty->low_latency.
On Fri, 02 Oct 2009 16:00:41 -0700
ebiederm@xmission.com (Eric W. Biederman) wrote:

>
>
> I have seen a hang in:
> /bin/stty (changing the baud rate)
> set_termios
> tty_wait_until_sent
> tty_chars_in_buffer
> ftdi_chars_in_buffer
>
> Where the driver wedged for a serial port and no progress
> was made.
>
> This happened to me several times with 2.6.31. My initial
> hypothesis was this was a hardware error (as it only happened
> on single piece of hardware). With all of the driver problems
> I suspect it could be a driver bug.

Driver bug I would think - or setup. If you've genuinely got the port
flow controlled then a request to set the termios after the I/O will wait
until a signal or carrier change (or indeed forever) quite correctly.


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