8250: of: remove remnants of generic of_serial driver

During build testing, I ran into a warning in a driver that I
had written myself at some point:

drivers/tty/serial/8250/8250_of.c: In function 'of_platform_serial_probe':
drivers/tty/serial/8250/8250_of.c:233:1: error: the frame size of 1200 bytes is larger than 1152 bytes [-Werror=frame-larger-than=]

This is harmless by itself, but it shows two other problems in
the driver:

- It still tries to be generic enough to handle all kinds of serial
  ports, where in reality the driver has been 8250-only for a while,
  and every other uart has its own DT support

- As a result of that generalization, we keep two copies of
  'struct uart_port' on the stack during probe(). This is completely
  unnessary.

Removing the last code dealing with unsupported port_type values
solves both problems nicely, and reduces the stack size.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 5281252..1cbadaf 100644 (file)
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -172,7 +172,8 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
 {
        const struct of_device_id *match;
        struct of_serial_info *info;
-       struct uart_port port;
+       struct uart_8250_port port8250;
+       u32 tx_threshold;
        int port_type;
        int ret;
 
@@ -188,41 +189,24 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
                return -ENOMEM;
 
        port_type = (unsigned long)match->data;
-       ret = of_platform_serial_setup(ofdev, port_type, &port, info);
+       memset(&port8250, 0, sizeof(port8250));
+       ret = of_platform_serial_setup(ofdev, port_type, &port8250.port, info);
        if (ret)
                goto out;
 
-       switch (port_type) {
-       case PORT_8250 ... PORT_MAX_8250:
-       {
-               u32 tx_threshold;
-               struct uart_8250_port port8250;
-               memset(&port8250, 0, sizeof(port8250));
-               port8250.port = port;
+       if (port8250.port.fifosize)
+               port8250.capabilities = UART_CAP_FIFO;
 
-               if (port.fifosize)
-                       port8250.capabilities = UART_CAP_FIFO;
+       /* Check for TX FIFO threshold & set tx_loadsz */
+       if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",
+                                 &tx_threshold) == 0) &&
+           (tx_threshold < port8250.port.fifosize))
+               port8250.tx_loadsz = port8250.port.fifosize - tx_threshold;
 
-               /* Check for TX FIFO threshold & set tx_loadsz */
-               if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",
-                                         &tx_threshold) == 0) &&
-                   (tx_threshold < port.fifosize))
-                       port8250.tx_loadsz = port.fifosize - tx_threshold;
+       if (of_property_read_bool(ofdev->dev.of_node, "auto-flow-control"))
+               port8250.capabilities |= UART_CAP_AFE;
 
-               if (of_property_read_bool(ofdev->dev.of_node,
-                                         "auto-flow-control"))
-                       port8250.capabilities |= UART_CAP_AFE;
-
-               ret = serial8250_register_8250_port(&port8250);
-               break;
-       }
-       default:
-               /* need to add code for these */
-       case PORT_UNKNOWN:
-               dev_info(&ofdev->dev, "Unknown serial port found, ignored\n");
-               ret = -ENODEV;
-               break;
-       }
+       ret = serial8250_register_8250_port(&port8250);
        if (ret < 0)
                goto out;
 
@@ -232,7 +216,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
        return 0;
 out:
        kfree(info);
-       irq_dispose_mapping(port.irq);
+       irq_dispose_mapping(port8250.port.irq);
        return ret;
 }
 
@@ -242,14 +226,8 @@ out:
 static int of_platform_serial_remove(struct platform_device *ofdev)
 {
        struct of_serial_info *info = platform_get_drvdata(ofdev);
-       switch (info->type) {
-       case PORT_8250 ... PORT_MAX_8250:
-               serial8250_unregister_port(info->line);
-               break;
-       default:
-               /* need to add code for these */
-               break;
-       }
+
+       serial8250_unregister_port(info->line);
 
        if (info->clk)
                clk_disable_unprepare(info->clk);
@@ -258,18 +236,23 @@ static int of_platform_serial_remove(struct platform_device *ofdev)
 }
 
 #ifdef CONFIG_PM_SLEEP
-static void of_serial_suspend_8250(struct of_serial_info *info)
+static int of_serial_suspend(struct device *dev)
 {
+       struct of_serial_info *info = dev_get_drvdata(dev);
        struct uart_8250_port *port8250 = serial8250_get_port(info->line);
        struct uart_port *port = &port8250->port;
 
        serial8250_suspend_port(info->line);
+
        if (info->clk && (!uart_console(port) || console_suspend_enabled))
                clk_disable_unprepare(info->clk);
+
+       return 0;
 }
 
-static void of_serial_resume_8250(struct of_serial_info *info)
+static int of_serial_resume(struct device *dev)
 {
+       struct of_serial_info *info = dev_get_drvdata(dev);
        struct uart_8250_port *port8250 = serial8250_get_port(info->line);
        struct uart_port *port = &port8250->port;
 
@@ -277,34 +260,6 @@ static void of_serial_resume_8250(struct of_serial_info *info)
                clk_prepare_enable(info->clk);
 
        serial8250_resume_port(info->line);
-}
-
-static int of_serial_suspend(struct device *dev)
-{
-       struct of_serial_info *info = dev_get_drvdata(dev);
-
-       switch (info->type) {
-       case PORT_8250 ... PORT_MAX_8250:
-               of_serial_suspend_8250(info);
-               break;
-       default:
-               break;
-       }
-
-       return 0;
-}
-
-static int of_serial_resume(struct device *dev)
-{
-       struct of_serial_info *info = dev_get_drvdata(dev);
-
-       switch (info->type) {
-       case PORT_8250 ... PORT_MAX_8250:
-               of_serial_resume_8250(info);
-               break;
-       default:
-               break;
-       }
 
        return 0;
 }