Greg,
On Fri, Feb 22, 2013 at 04:27:19PM +0000, Sean Young wrote:
> 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.
Would you mind accepting this patch please -- it fixes a regression I
introduced in 3.7.
Thanks,
Sean
> Reported-by: Vincent Deffontaines <vincent@xxxxxxxxxx>
> Tested-by: Vincent Deffontaines <vincent@xxxxxxxxxx>
> Signed-off-by: Sean Young <sean@xxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/tty/serial/8250/8250_pnp.c | 12 +++++++-----
> 1 files 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);
> --
> 1.7.2.5
>
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