serial: core: Simplify console suspend logic in uart_suspend_port()

When the uart port being suspended is a console and consoles are
not suspending (kernel command line contains no_console_suspend),
then no action is performed for that port, and the function can
return early.

If the function has not returned early, then one of the conditions
is not true, so the expression
   (console_suspend_enabled || !uart_console(uport))
must be true and can be eliminated.

Similarly, the expression
   (console_suspend_enabled && uart_console(uport))
simplifies to just uart_console(uport).

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

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 984605bb5bf1d593087bfffe485323538144b2c5..2c67a077042a9d953836fd3da4b93d1a8f9905a2 100644 (file)
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2008,23 +2008,24 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
        }
        put_device(tty_dev);
 
-       if (console_suspend_enabled || !uart_console(uport))
-               uport->suspended = 1;
+       /* Nothing to do if the console is not suspending */
+       if (!console_suspend_enabled && uart_console(uport))
+               goto unlock;
+
+       uport->suspended = 1;
 
        if (port->flags & ASYNC_INITIALIZED) {
                const struct uart_ops *ops = uport->ops;
                int tries;
 
-               if (console_suspend_enabled || !uart_console(uport)) {
-                       set_bit(ASYNCB_SUSPENDED, &port->flags);
-                       clear_bit(ASYNCB_INITIALIZED, &port->flags);
-
-                       spin_lock_irq(&uport->lock);
-                       ops->stop_tx(uport);
-                       ops->set_mctrl(uport, 0);
-                       ops->stop_rx(uport);
-                       spin_unlock_irq(&uport->lock);
-               }
+               set_bit(ASYNCB_SUSPENDED, &port->flags);
+               clear_bit(ASYNCB_INITIALIZED, &port->flags);
+
+               spin_lock_irq(&uport->lock);
+               ops->stop_tx(uport);
+               ops->set_mctrl(uport, 0);
+               ops->stop_rx(uport);
+               spin_unlock_irq(&uport->lock);
 
                /*
                 * Wait for the transmitter to empty.
@@ -2036,19 +2037,17 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
                                drv->dev_name,
                                drv->tty_driver->name_base + uport->line);
 
-               if (console_suspend_enabled || !uart_console(uport))
-                       ops->shutdown(uport);
+               ops->shutdown(uport);
        }
 
        /*
         * Disable the console device before suspending.
         */
-       if (console_suspend_enabled && uart_console(uport))
+       if (uart_console(uport))
                console_stop(uport->cons);
 
-       if (console_suspend_enabled || !uart_console(uport))
-               uart_change_pm(state, UART_PM_STATE_OFF);
-
+       uart_change_pm(state, UART_PM_STATE_OFF);
+unlock:
        mutex_unlock(&port->mutex);
 
        return 0;