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

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 <amworsley@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 1b51d43f1da12e227efc6d201a8926fd764fa3ca..486769c0f35c7e5996156b421cec9e95ae0049f4 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2080,13 +2080,19 @@ 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;
@@ -2127,6 +2133,7 @@ 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),
@@ -2154,6 +2161,7 @@ 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,