[regression, bisected] Xonar DX invalid PCI I/O range since 977d17bb174

[Clemens Ladisch <clemens@ladisch.de>]

I got the following bug report:
| After upgrading kernel from 2.6.32 to 2.6.34-rc4 my Xonar DX stopped
| working. Kernel log has:
| 
| [kernel] AV200 0000:09:04.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
| [kernel] invalid PCI I/O range
| [kernel] AV200 0000:09:04.0: PCI INT A disabled
| [kernel] ALSA device list:
| [kernel]   No soundcards found.
| 
| According to git bisect the culprit is:
| 
| commit 977d17bb1749517b353874ccdc9b85abc7a58c2a
| Author: Yinghai Lu <yinghai@kernel.org>
| Date:   Fri Jan 22 01:02:24 2010 -0800
| PCI: update bridge resources to get more big ranges in PCI assign unssigned

Unfortunately, the bug tracker is dead, so I cannot ask for further
information.  (If somebody renews the domain, this report will be at
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4982>.)

The Xonar DX is a PCI chip with a 256-byte I/O range behind a PCI-E/PCI
bridge.  The driver code that caught this looks as follows:

	err = pci_enable_device(pci);
	...
	err = pci_request_regions(pci, DRIVER);
	...
	if (!(pci_resource_flags(pci, 0) & IORESOURCE_IO) ||
	    pci_resource_len(pci, 0) < OXYGEN_IO_SIZE) {
		snd_printk(KERN_ERR "invalid PCI I/O range\n");


Regards,
Clemens