USB: ch341: fix termios handling
authorAlan Cox <alan@lxorguk.ukuu.org.uk>
Thu, 18 Oct 2007 08:24:18 +0000 (01:24 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 25 Oct 2007 19:18:40 +0000 (12:18 -0700)
The ch341 currently doesn't support most of the hardware setting.  So to keep
the termios data right we propogate the old termios hardware values back then
encode the speed.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/serial/ch341.c

index 6b252ceb39a828b69b29b78b2dfdfdf572a88bbd..42582d49b69c8951391e6a0a03c48f15d3756662 100644 (file)
@@ -272,9 +272,6 @@ static void ch341_set_termios(struct usb_serial_port *port,
 
        dbg("ch341_set_termios()");
 
-       if (!tty || !tty->termios)
-               return;
-
        baud_rate = tty_get_baud_rate(tty);
 
        switch (baud_rate) {
@@ -299,6 +296,11 @@ static void ch341_set_termios(struct usb_serial_port *port,
         * (cflag & PARENB) : parity {NONE, EVEN, ODD}
         * (cflag & CSTOPB) : stop bits [1, 2]
         */
+
+        /* Copy back the old hardware settings */
+        tty_termios_copy_hw(tty->termios, old_termios);
+        /* And re-encode with the new baud */
+        tty_encode_baud_rate(tty, baud_rate, baud_rate);
 }
 
 static struct usb_driver ch341_driver = {