tty: serial: uartlite: Use dynamic array for console port

Driver console functions are using pointer to static array with fixed
size. There can be only one serial console at the time which is found
by register_console(). register_console() is filling cons->index to
port->line value.

Signed-off-by: Shubhrajyoti Datta <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Shubhrajyoti Datta

drivers/tty/serial/uartlite.c

@@ -55,6 +55,11 @@
 #define ULITE_CONTROL_RST_RX	0x02
 #define ULITE_CONTROL_IE	0x10
 
+/* Static pointer to console port */
+#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
+static struct uart_port *console_port;
+#endif
+
 struct uartlite_data {
 	const struct uartlite_reg_ops *reg_ops;
 	struct clk *clk;
@@ -472,7 +477,7 @@ static void ulite_console_putchar(struct uart_port *port, int ch)
 static void ulite_console_write(struct console *co, const char *s,
 				unsigned int count)
 {
-	struct uart_port *port = &ulite_ports[co->index];
+	struct uart_port *port = console_port;
 	unsigned long flags;
 	unsigned int ier;
 	int locked = 1;
@@ -506,10 +511,8 @@ static int ulite_console_setup(struct console *co, char *options)
 	int parity = 'n';
 	int flow = 'n';
 
-	if (co->index < 0 || co->index >= ULITE_NR_UARTS)
-		return -EINVAL;
 
-	port = &ulite_ports[co->index];
+	port = console_port;
 
 	/* Has the device been initialized yet? */
 	if (!port->mapbase) {
@@ -652,6 +655,17 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
 
 	dev_set_drvdata(dev, port);
 
+#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
+	/*
+	 * If console hasn't been found yet try to assign this port
+	 * because it is required to be assigned for console setup function.
+	 * If register_console() don't assign value, then console_port pointer
+	 * is cleanup.
+	 */
+	if (ulite_uart_driver.cons->index == -1)
+		console_port = port;
+#endif
+
 	/* Register the port */
 	rc = uart_add_one_port(&ulite_uart_driver, port);
 	if (rc) {
@@ -661,6 +675,12 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
 		return rc;
 	}
 
+#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
+	/* This is not port which is used for console that's why clean it up */
+	if (ulite_uart_driver.cons->index == -1)
+		console_port = NULL;
+#endif
+
 	return 0;
 }