From 3393e255e6e0120b1f88d666c1b36b165f97467c Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@gmail.com>
Date: Tue, 10 Jan 2012 23:33:37 +0100
Subject: [PATCH] USB: ftdi_sio: fix TIOCSSERIAL baud_base handling
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commit eb833a9e0972f60beb4ab8104ad7ef6bf30f02fc upstream.

Return EINVAL if new baud_base does not match the current one.

The baud_base is device specific and can not be changed. This restores
the old (pre-2005) behaviour which was changed due to a
misunderstanding regarding this fact (see
https://lkml.org/lkml/2005/1/20/84).

Reported-by: Torbjörn Lofterud <torbjorn@pi.nxs.se>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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