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SubjectRe: [v2.6.34-stable 137/165] USB: Fix Corruption issue in USB ftdi driver ftdi_sio.c
On Wed, Aug 15, 2012 at 03:48:01PM -0400, Paul Gortmaker wrote:
> From: Andrew Worsley <>
> -------------------
> This is a commit scheduled for the next v2.6.34 longterm release.
> If you see a problem with using this for longterm, please comment.
> -------------------
> commit b1ffb4c851f185e9051ba837c16d9b84ef688d26 upstream.
> Fix for ftdi_set_termios() glitching output
> ftdi_set_termios() is constantly setting the baud rate, data bits and parity
> unnecessarily on every call, . When called while characters are being
> transmitted can cause the FTDI chip to corrupt the serial port bit stream
> output by stalling the output half a bit during the output of a character.
> Simple fix by skipping this setting if the baud rate/data bits/parity are
> unchanged.
> Signed-off-by: Andrew Worsley <>

commit 108e02b12921078a59dcacd048079ece48a4a983 ("USB: ftdi_sio: fix
initial baud rate") says it addresses a regression on this change,
something to consider for inclusion with this update.


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