tty: Replace ASYNC_INITIALIZED bit and update atomically

Replace ASYNC_INITIALIZED bit in the tty_port::flags field with
TTY_PORT_INITIALIZED bit in the tty_port::iflags field. Introduce helpers
tty_port_set_initialized() and tty_port_initialized() to abstract
atomic bit ops.

Note: the transforms for test_and_set_bit() and test_and_clear_bit()
are unnecessary as the state transitions are already mutually exclusive;
the tty lock prevents concurrent open/close/hangup.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index a66b01bb1fa1..8967715fe6fc 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -127,7 +127,7 @@ static int usb_console_setup(struct console *co, char *options)
         info->port = port;
 
         ++port->port.count;
-        if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) {
+        if (!tty_port_initialized(&port->port)) {
                 if (serial->type->set_termios) {
                         /*
                          * allocate a fake tty so the driver can initialize
@@ -168,7 +168,7 @@ static int usb_console_setup(struct console *co, char *options)
                         tty_port_tty_set(&port->port, NULL);
                         tty_kref_put(tty);
                 }
-                set_bit(ASYNCB_INITIALIZED, &port->port.flags);
+                tty_port_set_initialized(&port->port, 1);
         }
         /* Now that any required fake tty operations are completed restore
          * the tty port count */