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

commit c515598e0f5769916c31c00392cc2bfe6af74e55 upstream.

  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>
Cc: Lotfi Manseur <lotfi.manseur@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 7639cba79092ddda6f991dd89df8b0bcdc19a797..457122a5a965a01048d9288da11be2f3732d86cc 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2141,6 +2141,9 @@ 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)
@@ -2154,6 +2157,7 @@ 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;