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, 3 insertions, 3 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 54e170dd3dad..ae8c0365abd6 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -473,7 +473,7 @@ static bool usb_serial_generic_msr_changed(struct tty_struct *tty,
          * Use tty-port initialised flag to detect all hangups including the
          * one generated at USB-device disconnect.
          */
-        if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
+        if (!tty_port_initialized(&port->port))
                 return true;
 
         spin_lock_irqsave(&port->lock, flags);
@@ -503,7 +503,7 @@ int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg)
 
         ret = wait_event_interruptible(port->port.delta_msr_wait,
                         usb_serial_generic_msr_changed(tty, arg, &cnow));
-        if (!ret && !test_bit(ASYNCB_INITIALIZED, &port->port.flags))
+        if (!ret && !tty_port_initialized(&port->port))
                 ret = -EIO;
 
         return ret;
@@ -606,7 +606,7 @@ int usb_serial_generic_resume(struct usb_serial *serial)
 
         for (i = 0; i < serial->num_ports; i++) {
                 port = serial->port[i];
-                if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
+                if (!tty_port_initialized(&port->port))
                         continue;
 
                 if (port->bulk_in_size) {