uart: update the sysfs handler to use uart_get_info

The two patches needed are now in the tree. The first added the sysfs
interface and directly accesses the uartclk. The second provides a
proper interface for getting the values.

Wire them together.

This formes a basis for both get and set methods for any of the other uart
properties and we can now fill them out further.

Signed-off-by: Alan Cox <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/serial_core.c

···
 static ssize_t uart_get_attr_uartclk(struct device *dev,
 	struct device_attribute *attr, char *buf)
 {
-	int ret;
+	struct serial_struct tmp;
 	struct tty_port *port = dev_get_drvdata(dev);
 	struct uart_state *state = container_of(port, struct uart_state, port);
 
-	mutex_lock(&state->port.mutex);
-	ret = snprintf(buf, PAGE_SIZE, "%d\n", state->uart_port->uartclk);
-	mutex_unlock(&state->port.mutex);
+	mutex_lock(&port->mutex);
+	uart_get_info(port, state, &tmp);
+	mutex_unlock(&port->mutex);
 
-	return ret;
+	return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16);
 }
 
 static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL);