commit: 77e372a3d82e5e4878ce1962207edd766773cc76
From: Sean Young <sean@xxxxxxxx>
Date: Fri, 22 Feb 2013 16:27:19 +0000
Subject: tty/8250_pnp: serial port detection regression since v3.7
The InsydeH2O BIOS (version dated 09/12/2011) has the following in
its pnp resouces for its serial ports:
$ cat /sys/bus/pnp/devices/00:0b/resources
state = active
io disabled
irq disabled
We do not check if the resources are disabled, and create a bogus
ttyS* device. Since commit 835d844d1a28e (8250_pnp: do pnp probe
before legacy probe) we get a bogus ttyS0, which prevents the legacy
probe from detecting it.
Note, the BIOS can also be upgraded, fixing this problem, but for people
who can't do that, this fix is needed.
Reported-by: Vincent Deffontaines <vincent@xxxxxxxxxx>
Tested-by: Vincent Deffontaines <vincent@xxxxxxxxxx>
Signed-off-by: Sean Young <sean@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_pnp.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c
index 35d9ab9..b3455a9 100644
--- a/drivers/tty/serial/8250/8250_pnp.c
+++ b/drivers/tty/serial/8250/8250_pnp.c
@@ -429,6 +429,7 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
struct uart_8250_port uart;
int ret, line, flags = dev_id->driver_data;
+ struct resource *res = NULL;
if (flags & UNKNOWN_DEV) {
ret = serial_pnp_guess_board(dev);
@@ -439,11 +440,12 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
memset(&uart, 0, sizeof(uart));
if (pnp_irq_valid(dev, 0))
uart.port.irq = pnp_irq(dev, 0);
- if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) {
- uart.port.iobase = pnp_port_start(dev, 2);
- uart.port.iotype = UPIO_PORT;
- } else if (pnp_port_valid(dev, 0)) {
- uart.port.iobase = pnp_port_start(dev, 0);
+ if ((flags & CIR_PORT) && pnp_port_valid(dev, 2))
+ res = pnp_get_resource(dev, IORESOURCE_IO, 2);
+ else if (pnp_port_valid(dev, 0))
+ res = pnp_get_resource(dev, IORESOURCE_IO, 0);
+ if (pnp_resource_enabled(res)) {
+ uart.port.iobase = res->start;
uart.port.iotype = UPIO_PORT;
} else if (pnp_mem_valid(dev, 0)) {
uart.port.mapbase = pnp_mem_start(dev, 0);
--
1.7.10.4
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