Revert "serial: Delete dead code for CIR serial ports"

This reverts commit 1104321a7b3bb670dc614ffa7958c553e7b3b836.

The code is not dead at all and breaks winbond-cir.

Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
00:03: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a CIR port
lirc lirc0: lirc_dev: driver ir-lirc-codec (winbond-cir) registered at minor = 0
winbond-cir 00:03: Region 0x2f8-0x2ff already in use!
winbond-cir: probe of 00:03 failed with error -16

Signed-off-by: Sean Young <sean@mess.org>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 17 insertions, 6 deletions

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index b5def356af63..1aab3010fbfa 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1043,13 +1043,24 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
                 if (up->dl_write)
                         uart->dl_write = up->dl_write;
 
-                if (serial8250_isa_config != NULL)
-                        serial8250_isa_config(0, &uart->port,
-                                        &uart->capabilities);
+                if (uart->port.type != PORT_8250_CIR) {
+                        if (serial8250_isa_config != NULL)
+                                serial8250_isa_config(0, &uart->port,
+                                                &uart->capabilities);
+
+                        ret = uart_add_one_port(&serial8250_reg,
+                                                &uart->port);
+                        if (ret == 0)
+                                ret = uart->port.line;
+                } else {
+                        dev_info(uart->port.dev,
+                                "skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
+                                uart->port.iobase,
+                                (unsigned long long)uart->port.mapbase,
+                                uart->port.irq);
 
-                ret = uart_add_one_port(&serial8250_reg, &uart->port);
-                if (ret == 0)
-                        ret = uart->port.line;
+                        ret = 0;
+                }
         }
         mutex_unlock(&serial_mutex);