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/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index a6c4a1b895bd..94a14f5dc4d4 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1680,7 +1680,7 @@ static int acm_resume(struct usb_interface *intf)
         if (--acm->susp_count)
                 goto out;
 
-        if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags)) {
+        if (tty_port_initialized(&acm->port)) {
                 rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
 
                 for (;;) {
@@ -1710,7 +1710,7 @@ static int acm_reset_resume(struct usb_interface *intf)
 {
         struct acm *acm = usb_get_intfdata(intf);
 
-        if (test_bit(ASYNCB_INITIALIZED, &acm->port.flags))
+        if (tty_port_initialized(&acm->port))
                 tty_port_tty_hangup(&acm->port, false);
 
         return acm_resume(intf);