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>
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 130c8cf..c3f9d93 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -204,7 +204,8 @@
if (port->console)
goto out;
- if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {
+ if (tty_port_initialized(port)) {
+ tty_port_set_initialized(port, 0);
/*
* Drop DTR/RTS if HUPCL is set. This causes any attached
* modem to hang up the line.
@@ -393,13 +394,13 @@
while (1) {
/* Indicate we are open */
- if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
+ if (C_BAUD(tty) && tty_port_initialized(port))
tty_port_raise_dtr_rts(port);
prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
/* Check for a hangup or uninitialised port.
Return accordingly */
- if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
+ if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
@@ -480,7 +481,7 @@
tty->closing = 1;
- if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+ if (tty_port_initialized(port)) {
/* Don't block on a stalled port, just pull the chain */
if (tty->flow_stopped)
tty_driver_flush_buffer(tty);
@@ -578,7 +579,7 @@
mutex_lock(&port->mutex);
- if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+ if (!tty_port_initialized(port)) {
clear_bit(TTY_IO_ERROR, &tty->flags);
if (port->ops->activate) {
int retval = port->ops->activate(port, tty);
@@ -587,7 +588,7 @@
return retval;
}
}
- set_bit(ASYNCB_INITIALIZED, &port->flags);
+ tty_port_set_initialized(port, 1);
}
mutex_unlock(&port->mutex);
return tty_port_block_til_ready(port, tty, filp);