1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 8fe034d2d3e7..ff3db5d056a5 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -736,6 +736,7 @@ static struct usb_device_id id_table_combined [] = {
         { USB_DEVICE(TML_VID, TML_USB_SERIAL_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_ELSTER_UNICOM_PID) },
         { USB_DEVICE(FTDI_VID, FTDI_PROPOX_JTAGCABLEII_PID) },
+        { USB_DEVICE(FTDI_VID, FTDI_PROPOX_ISPCABLEIII_PID) },
         { USB_DEVICE(OLIMEX_VID, OLIMEX_ARM_USB_OCD_PID),
                 .driver_info = (kernel_ulong_t)&ftdi_jtag_quirk },
         { USB_DEVICE(OLIMEX_VID, OLIMEX_ARM_USB_OCD_H_PID),
@@ -2104,13 +2105,19 @@ 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 +2158,7 @@ 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 +2186,7 @@ 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,