8250: use correct value for PORT_BRCM_TRUMANAGE

When backporting commit ebebd49a8eab ('8250/16?50: Add support for
Broadcom TruManage redirected serial port') I took the next
available port type number for PORT_BRCM_TRUMANAGE (22).

However, the 8250 port type numbers are exposed to userland through
the TIOC{G,S}SERIAL ioctls and so must remain stable.  Redefine
PORT_BRCM_TRUMANAGE as 25, matching mainline as of commit
85f024401bf807.

This leaves port types 22-24 within the valid range for 8250 but not
implemented there.  Change serial8250_verify_port() to specifically
reject these and change serial8250_type() to return "unknown" for them
(though I'm not sure why it would ever see them).

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/tty/serial/8250.c b/drivers/tty/serial/8250.c
index 90dad17..6748568 100644 (file)
--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -2695,7 +2695,7 @@ serial8250_verify_port(struct uart_port *port, struct serial_struct *ser)
        if (ser->irq >= nr_irqs || ser->irq < 0 ||
            ser->baud_base < 9600 || ser->type < PORT_UNKNOWN ||
            ser->type >= ARRAY_SIZE(uart_config) || ser->type == PORT_CIRRUS ||
-           ser->type == PORT_STARTECH)
+           ser->type == PORT_STARTECH || uart_config[ser->type].name == NULL)
                return -EINVAL;
        return 0;
 }
@@ -2705,7 +2705,7 @@ serial8250_type(struct uart_port *port)
 {
        int type = port->type;
 
-       if (type >= ARRAY_SIZE(uart_config))
+       if (type >= ARRAY_SIZE(uart_config) || uart_config[type].name == NULL)
                type = 0;
        return uart_config[type].name;
 }

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 8bec265..bae516e 100644 (file)
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -47,8 +47,8 @@
 #define PORT_U6_16550A 19      /* ST-Ericsson U6xxx internal UART */
 #define PORT_TEGRA     20      /* NVIDIA Tegra internal UART */
 #define PORT_XR17D15X  21      /* Exar XR17D15x UART */
-#define PORT_BRCM_TRUMANAGE    22
-#define PORT_MAX_8250  22      /* max port ID */
+#define PORT_BRCM_TRUMANAGE    25
+#define PORT_MAX_8250  25      /* max port ID */
 
 /*
  * ARM specific type numbers.  These are not currently guaranteed