From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
[xr: Backported to 3.4: Adjust filenames]
Signed-off-by: Rui Xiang <rui.xiang@xxxxxxxxxx>
---
drivers/tty/serial/8250/8250.c | 4 ++--
include/linux/serial_core.h | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index f81ce1e5..c5d550f 100644
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -2652,7 +2652,7 @@ 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;
}
@@ -2662,7 +2662,7 @@ 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 17a5a86..ce132b5 100644
--- 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
--
1.8.2.2
--
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