tty: Replace ASYNC_CTS_FLOW bit and update atomically

Replace ASYNC_CTS_FLOW bit in the tty_port::flags field with
TTY_PORT_CTS_FLOW bit in the tty_port::iflags field. Add
tty_port_set_cts_flow() helper to abstract the atomic bit ops.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index f23c2a101688..8f3fdad37ac7 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -711,8 +711,8 @@ static int mxser_change_speed(struct tty_struct *tty,
         /* CTS flow control flag and modem status interrupts */
         info->IER &= ~UART_IER_MSI;
         info->MCR &= ~UART_MCR_AFE;
+        tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
         if (cflag & CRTSCTS) {
-                info->port.flags |= ASYNC_CTS_FLOW;
                 info->IER |= UART_IER_MSI;
                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
                         info->MCR |= UART_MCR_AFE;
@@ -744,8 +744,6 @@ static int mxser_change_speed(struct tty_struct *tty,
                                 }
                         }
                 }
-        } else {
-                info->port.flags &= ~ASYNC_CTS_FLOW;
         }
         outb(info->MCR, info->ioaddr + UART_MCR);
         if (cflag & CLOCAL) {