tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically
Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.
Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 0b802cd..eb8311b 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1042,9 +1042,10 @@
}
}
spin_lock_irq(&port->lock);
- info->port.flags &= ~(ASYNC_INITIALIZED | ASYNC_NORMAL_ACTIVE);
+ port->flags &= ~ASYNC_INITIALIZED;
tty->closing = 0;
spin_unlock_irq(&port->lock);
+ tty_port_set_active(port, 0);
mutex_unlock(&port->mutex);
tty_port_tty_set(port, NULL);
@@ -1624,7 +1625,7 @@
/* Write remaining data into the port's xmit_buf */
while (1) {
/* Hung up ? */
- if (!test_bit(ASYNCB_NORMAL_ACTIVE, &info->port.flags))
+ if (!tty_port_active(&info->port))
goto end;
c = min(count, XMIT_BUF_SIZE - info->xmit_cnt - 1);
c = min(c, XMIT_BUF_SIZE - info->xmit_head);