USB: Fix Corruption issue in USB ftdi driver ftdi_sio.c

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 <amworsley@gmail.com>
Cc: stable <stable@vger.kernel.org>
----

  I had a brief run with strace on the getty and it was doing ioctl()s on
  each call but it didn't look relavant to the problem. I think the issue is
  that XON/XOFF flow control was being implmented via hardware - for the ixoff
  to allow the user to use XON/XOFF to control output. Unfortunately it would
  send 3 Control URBs updating all of the settings after each piece of input

  I am trying to work around the issue of gmail messing with the tab/spacing
  by submitting via SMTP via gmail which I believe should fix the issue.

  The patch is against v3.2-rc2 and compiles - but no additional testing in
  this kernel has been done.

  Thanks

   Andrew
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 8fe034d2d3e7..bd4298bb6750 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2104,13 +2104,19 @@ static void ftdi_set_termios(struct tty_struct *tty,
 
         cflag = termios->c_cflag;
 
-        /* FIXME -For this cut I don't care if the line is really changing or
-           not  - so just do the change regardless  - should be able to
-           compare old_termios and tty->termios */
+        if (old_termios->c_cflag == termios->c_cflag
+            && old_termios->c_ispeed == termios->c_ispeed
+            && old_termios->c_ospeed == termios->c_ospeed)
+                goto no_c_cflag_changes;
+
         /* NOTE These routines can get interrupted by
            ftdi_sio_read_bulk_callback  - need to examine what this means -
            don't see any problems yet */
 
+        if ((old_termios->c_cflag & (CSIZE|PARODD|PARENB|CMSPAR|CSTOPB)) ==
+            (termios->c_cflag & (CSIZE|PARODD|PARENB|CMSPAR|CSTOPB)))
+                goto no_data_parity_stop_changes;
+
         /* Set number of data bits, parity, stop bits */
 
         urb_value = 0;
@@ -2151,6 +2157,7 @@ static void ftdi_set_termios(struct tty_struct *tty,
         }
 
         /* Now do the baudrate */
+no_data_parity_stop_changes:
         if ((cflag & CBAUD) == B0) {
                 /* Disable flow control */
                 if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
@@ -2178,6 +2185,7 @@ static void ftdi_set_termios(struct tty_struct *tty,
 
         /* Set flow control */
         /* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
+no_c_cflag_changes:
         if (cflag & CRTSCTS) {
                 dbg("%s Setting to CRTSCTS flow control", __func__);
                 if (usb_control_msg(dev,