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USB: ch341: fix termios handling

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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>
This commit is contained in:
Alan Cox 2007-10-18 01:24:18 -07:00 committed by Greg Kroah-Hartman
parent 7cc7ee2826
commit 73f5930819
1 changed files with 5 additions and 3 deletions
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8
drivers/usb/serial/ch341.c
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@ -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 = {