Re: Why does printk helps PCMCIA card to initialise?

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Sun, Feb 20, 2005 at 12:44:25PM +0100, Martin Drohmann wrote:
>  #ifdef CONFIG_PCI
>         if (s->cb_dev) {
>                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
>                                              min, 0, pcmcia_align, &data);
>         } else
>  #endif
> -        printk("This line will never be printed, but it helps!!!");

If you added this, you've done much more than just adding it.  Look 
two lines above and realise that you've just changed what the "else"
clause conditionalises.

>                 ret = allocate_resource(&ioport_resource, res, num, min, 
> ~0UL,
>                                         1, pcmcia_align, &data);

So, with your printk in place, we try pci_bus_alloc_resource.  If that
succeeds or fails, we completely stomp on that with allocate_resource.
Bad.  Very bad.

The first thing that needs solving is why you're getting the "odd IO
request" crap.  That may explain why the resource can't be allocated.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core