USB: serial: ftdi_sio: Handle the old_termios == 0 case e.g. uart_resume_port()

  Handle null old_termios in ftdi_set_termios() calls from uart_resume_port().

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

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index bd4298bb6750..13e4ecc6e43d 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2104,6 +2104,9 @@ static void ftdi_set_termios(struct tty_struct *tty,
 
         cflag = termios->c_cflag;
 
+        if (old_termios == 0)
+                goto no_skip;
+
         if (old_termios->c_cflag == termios->c_cflag
             && old_termios->c_ispeed == termios->c_ispeed
             && old_termios->c_ospeed == termios->c_ospeed)
@@ -2117,6 +2120,7 @@ static void ftdi_set_termios(struct tty_struct *tty,
             (termios->c_cflag & (CSIZE|PARODD|PARENB|CMSPAR|CSTOPB)))
                 goto no_data_parity_stop_changes;
 
+no_skip:
         /* Set number of data bits, parity, stop bits */
 
         urb_value = 0;