serial: meson: make use of uart_port member mapsize

Member mapsize of struct uart_port is meant to store the resource size.
By using it we can get rid of meson_uart_res_size().

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
index e93a1e4..1220c9a 100644 (file)
--- a/drivers/tty/serial/meson_uart.c
+++ b/drivers/tty/serial/meson_uart.c
@@ -402,26 +402,11 @@ static int meson_uart_verify_port(struct uart_port *port,
        return ret;
 }
 
-static int meson_uart_res_size(struct uart_port *port)
-{
-       struct platform_device *pdev = to_platform_device(port->dev);
-       struct resource *res;
-
-       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       if (!res) {
-               dev_err(port->dev, "cannot obtain I/O memory region");
-               return -ENODEV;
-       }
-
-       return resource_size(res);
-}
-
 static void meson_uart_release_port(struct uart_port *port)
 {
-       int size = meson_uart_res_size(port);
-
        if (port->flags & UPF_IOREMAP) {
-               devm_release_mem_region(port->dev, port->mapbase, size);
+               devm_release_mem_region(port->dev, port->mapbase,
+                                       port->mapsize);
                devm_iounmap(port->dev, port->membase);
                port->membase = NULL;
        }
@@ -429,12 +414,7 @@ static void meson_uart_release_port(struct uart_port *port)
 
 static int meson_uart_request_port(struct uart_port *port)
 {
-       int size = meson_uart_res_size(port);
-
-       if (size < 0)
-               return size;
-
-       if (!devm_request_mem_region(port->dev, port->mapbase, size,
+       if (!devm_request_mem_region(port->dev, port->mapbase, port->mapsize,
                                     dev_name(port->dev))) {
                dev_err(port->dev, "Memory region busy\n");
                return -EBUSY;
@@ -443,7 +423,7 @@ static int meson_uart_request_port(struct uart_port *port)
        if (port->flags & UPF_IOREMAP) {
                port->membase = devm_ioremap_nocache(port->dev,
                                                     port->mapbase,
-                                                    size);
+                                                    port->mapsize);
                if (port->membase == NULL)
                        return -ENOMEM;
        }
@@ -641,6 +621,7 @@ static int meson_uart_probe(struct platform_device *pdev)
        port->uartclk = clk_get_rate(clk);
        port->iotype = UPIO_MEM;
        port->mapbase = res_mem->start;
+       port->mapsize = resource_size(res_mem);
        port->irq = res_irq->start;
        port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;
        port->dev = &pdev->dev;