Re: 2.6.17-rc[56]-mm*: pcmcia "I/O resource not free"

[Andy Isaacson <adi@hexapodia.org>]

On Wed, Jun 21, 2006 at 12:46:30AM -0700, Andrew Morton wrote:
> > [ 2034.060000] pcmcia: registering new device pcmcia0.0
> > [ 2034.060000] PM: Adding info for pcmcia:0.0
> > [ 2035.976000] conflict: PCI IO[0->ffff]
> > [ 2035.976000] hwif_request_region: single-byte request for ide2
> > [ 2035.976000]  [<c0257386>] hwif_request_region+0xa6/0xb0
[snip]
> > [ 2035.976000] ide2: I/O resource 0xF8B0200E-0xF8B0200E not free.
> > [ 2035.976000] ide2: ports already in use, skipping probe
> 
> hm.  It appears to have decided that 0 < 0xF8B0200E < 0xffff, which is
> clever of it.
> 
> Does it help if you set CONFIG_RESOURCES_32BIT?

Nope, same conflict with CONFIG_RESOURCES_32BIT set.  You're right, it
is deciding that 0xF8B0200E conflicts with that range:

conflict: PCI IO[0->ffff] conflicts with ide2[f8b3c00e->f8b3c00e]

Looking at the code, I don't understand how this could have worked in
-rc6; __request_resource hasn't changed, and it says

    167         if (end < start)
    168                 return root;
    169         if (start < root->start)
    170                 return root;
    171         if (end > root->end)
    172                 return root;

If root-> start == 0 and root->end == 0xffff, we should always hit line
172, unless sign extension is in effect... and all the variables are
unsigned long in -rc6, so that doesn't make sense.

Rebooting into -rc6 with some debugging...

-andy