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USB: serial: cp210x: update control-characters on every change 

Update the XON/XOFF control characters also when no other flow-control
flag has changed and software flow control is enabled.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2021-01-18 12:13:28 +01:00
parent f61309d9c9
commit 03f32d7cb5
1 changed files with 7 additions and 3 deletions
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10
drivers/usb/serial/cp210x.c
View File

@ -1113,11 +1113,13 @@ static int cp210x_set_chars(struct usb_serial_port *port,
static bool cp210x_termios_change(const struct ktermios *a, const struct ktermios *b)
{
bool iflag_change;
bool iflag_change, cc_change;
iflag_change = ((a->c_iflag ^ b->c_iflag) & (INPCK | IXON | IXOFF));
cc_change = a->c_cc[VSTART] != b->c_cc[VSTART] ||
a->c_cc[VSTOP] != b->c_cc[VSTOP];
return tty_termios_hw_change(a, b) || iflag_change;
return tty_termios_hw_change(a, b) || iflag_change || cc_change;
}
static void cp210x_set_flow_control(struct tty_struct *tty,
@ -1132,7 +1134,9 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
if (old_termios &&
C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
I_IXON(tty) == (old_termios->c_iflag & IXON) &&
I_IXOFF(tty) == (old_termios->c_iflag & IXOFF)) {
I_IXOFF(tty) == (old_termios->c_iflag & IXOFF) &&
START_CHAR(tty) == old_termios->c_cc[VSTART] &&
STOP_CHAR(tty) == old_termios->c_cc[VSTOP]) {
return;
}