tty: ar933x_uart: use config_enabled() macro to clean up ifdefs

Add a new ar933x_uart_console_enabled() helper function
which uses the config_enable(CONFIG_SERIAL_AR933X_CONSOLE)
macro to decide if the console support is enabled or not.

Remove the 'ifdef CONFIG_SERIAL_AR933X_CONSOLE' statements
and use the new helper function to conditionally enable
console support instead.

If CONFIG_SERIAL_AR933X_CONSOLE is not enabled, the new
helper function will become a null stub which allows the
compiler to optimize out the unused console specific
functions/variables.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 12 insertions, 13 deletions

diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
index 2d83a45dcc8d..0437a9e08d58 100644
--- a/drivers/tty/serial/ar933x_uart.c
+++ b/drivers/tty/serial/ar933x_uart.c
@@ -50,6 +50,11 @@ struct ar933x_uart_port {
         struct clk              *clk;
 };
 
+static inline bool ar933x_uart_console_enabled(void)
+{
+        return config_enabled(CONFIG_SERIAL_AR933X_CONSOLE);
+}
+
 static inline unsigned int ar933x_uart_read(struct ar933x_uart_port *up,
                                             int offset)
 {
@@ -500,8 +505,6 @@ static struct uart_ops ar933x_uart_ops = {
         .verify_port    = ar933x_uart_verify_port,
 };
 
-#ifdef CONFIG_SERIAL_AR933X_CONSOLE
-
 static struct ar933x_uart_port *
 ar933x_console_ports[CONFIG_SERIAL_AR933X_NR_UARTS];
 
@@ -600,25 +603,18 @@ static struct console ar933x_uart_console = {
 
 static void ar933x_uart_add_console_port(struct ar933x_uart_port *up)
 {
+        if (!ar933x_uart_console_enabled())
+                return;
+
         ar933x_console_ports[up->port.line] = up;
 }
 
-#define AR933X_SERIAL_CONSOLE   (&ar933x_uart_console)
-
-#else
-
-static inline void ar933x_uart_add_console_port(struct ar933x_uart_port *up) {}
-
-#define AR933X_SERIAL_CONSOLE   NULL
-
-#endif /* CONFIG_SERIAL_AR933X_CONSOLE */
-
 static struct uart_driver ar933x_uart_driver = {
         .owner          = THIS_MODULE,
         .driver_name    = DRIVER_NAME,
         .dev_name       = "ttyATH",
         .nr             = CONFIG_SERIAL_AR933X_NR_UARTS,
-        .cons           = AR933X_SERIAL_CONSOLE,
+        .cons           = NULL, /* filled in runtime */
 };
 
 static int ar933x_uart_probe(struct platform_device *pdev)
@@ -730,6 +726,9 @@ static int __init ar933x_uart_init(void)
 {
         int ret;
 
+        if (ar933x_uart_console_enabled())
+                ar933x_uart_driver.cons = &ar933x_uart_console;
+
         ret = uart_register_driver(&ar933x_uart_driver);
         if (ret)
                 goto err_out;