[PATCH 4/6] serial: meson: make use of uart_port member mapsize

[Neil Armstrong]

On 04/16/2017 10:15 PM, Heiner Kallweit wrote:
> 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 at gmail.com>
> ---
>  drivers/tty/serial/meson_uart.c | 29 +++++------------------------
>  1 file changed, 5 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c
> index 714b29ad..8d2e7203 100644
> --- a/drivers/tty/serial/meson_uart.c
> +++ b/drivers/tty/serial/meson_uart.c
> @@ -393,26 +393,11 @@ 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;
>  	}
> @@ -420,12 +405,7 @@ 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;
> @@ -434,7 +414,7 @@ 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;
>  	}
> @@ -629,6 +609,7 @@ 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;
> 

Reviewed-by: Neil Armstrong <narmstrong at baylibre.com>