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Revert "tty/8250_pnp: serial port detection regression since v3.7"

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This reverts commit 77e372a3d8.

Checking for disabled resources board breaks detection pnp on another
board "AMI UEFI implementation (Version: 0406 Release Date: 06/06/2012)".
I'm working with the reporter of the original bug to write and test
a better fix.

https://bugzilla.redhat.com/show_bug.cgi?id=928246

Signed-off-by: Sean Young <sean@mess.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Young 2013-04-07 20:47:18 +01:00 committed by Greg Kroah-Hartman
parent 1f66396682
commit c12f9ea28e
1 changed files with 5 additions and 7 deletions
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12
drivers/tty/serial/8250/8250_pnp.c
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@ -429,7 +429,6 @@ 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);
@ -440,12 +439,11 @@ 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))
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;
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);
uart.port.iotype = UPIO_PORT;
} else if (pnp_mem_valid(dev, 0)) {
uart.port.mapbase = pnp_mem_start(dev, 0);