serial: add a new helper function

In most of the time, the driver needs to check if the cts flow control
is enabled. But now, the driver checks the ASYNC_CTS_FLOW flag manually,
which is not a grace way. So add a new wraper function to make the code
tidy and clean.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index bb2da4ca8257..cfda47dabd28 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -830,7 +830,7 @@ static void mxser_check_modem_status(struct tty_struct *tty,
                         wake_up_interruptible(&port->port.open_wait);
         }
 
-        if (port->port.flags & ASYNC_CTS_FLOW) {
+        if (tty_port_cts_enabled(&port->port)) {
                 if (tty->hw_stopped) {
                         if (status & UART_MSR_CTS) {
                                 tty->hw_stopped = 0;