linux-kernel - i82875p_edac: BAR 0 collision

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Date:	Fri, 7 Nov 2008 13:43:55 +0200
From:	Jarkko Lavinen <jlavi@....fi>
To:	linux-kernel@...r.kernel.org
Subject: i82875p_edac: BAR 0 collision

When I try to load i82875p_edac module on ASUS P4C800 Deluxe in 2.6.26
or 2.6.27 it fails due to BAR 0 collision. On 2.6.25 the
i82875p_edac works just fine.

Should i82875p_setup_overfl_dev() do some additional work to fix the
missing resource of the hidden overflow device?

When I try load i82875p_edac module on 2.6.27 I get

  # modprobe i82875p_edac
  FATAL: Error inserting i82875p_edac
  (/lib/modules/2.6.27.4/kernel/drivers/edac/i82875p_edac.ko): No such device

And dmesg shows (from 2.6.27.4):

  EDAC MC: Ver: 2.1.0 Oct 30 2008
  EDAC DEBUG: edac_pci_dev_parity_clear()
  ...
  EDAC DEBUG: edac_pci_dev_parity_clear()
  EDAC DEBUG: edac_sysfs_setup_mc_kset()
  EDAC DEBUG: edac_sysfs_setup_mc_kset() Registered '.../edac/mc' kobject
  EDAC DEBUG: i82875p_init_one()
  EDAC i82875p: i82875p init one
  EDAC DEBUG: i82875p_probe1()
  PCI: 0000:00:06.0 reg 10 32bit mmio: [fecf0000, fecf0fff]
  pci 0000:00:06.0: device not available because of BAR 0 [0xfecf0000-0xfecf0fff] collisions
  EDAC i82875p: i82875p_setup_overfl_dev(): Failed to enable overflow device
  EDAC DEBUG: 875p init fail

On 2.6.25.19 loading i82875p_edac works just fine and dmesg shows:

  EDAC MC: Ver: 2.1.0 Nov  4 2008
  EDAC i82875p: i82875p init one
  EDAC MC0: Giving out device to 'i82875p_edac' 'i82875p': DEV 0000:00:00.0
  EDAC PCI0: Giving out device to module 'i82875p_edac' controller 'EDAC PCI controller': DEV '0000:00:00.0' (POLLED)

Cheers
Jarkko Lavinen
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