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, 2 insertions, 5 deletions

diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 3768e5c71c0b..0e4290183280 100644
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -1966,11 +1966,8 @@ static void mgsl_change_params(struct mgsl_struct *info)
         }
         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 
-        if (cflag & CRTSCTS)
-                info->port.flags |= ASYNC_CTS_FLOW;
-        else
-                info->port.flags &= ~ASYNC_CTS_FLOW;
-                
+        tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
+
         if (cflag & CLOCAL)
                 info->port.flags &= ~ASYNC_CHECK_CD;
         else