[Xen-devel] MSI error when reloading iwlagn module

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Hi,

With a fairly current kernel + xen, I'm seeing this if I rmmod iwlagn
and try to reload it:

[51230.646678] Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
[51230.646685] Copyright(c) 2003-2011 Intel Corporation
[51230.646760] xen: registering gsi 17 triggering 0 polarity 1
[51230.646773] xen_map_pirq_gsi: returning irq 17 for gsi 17
[51230.646777] xen: --> pirq=17 -> irq=17 (gsi=17)
[51230.646781] Already setup the GSI :17
[51230.646789] iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[51230.646814] iwlagn 0000:03:00.0: setting latency timer to 64
[51230.646935] iwlagn 0000:03:00.0: pci_resource_len = 0x00002000
[51230.646941] iwlagn 0000:03:00.0: pci_resource_base = ffffc9000671c000
[51230.646945] iwlagn 0000:03:00.0: HW Revision ID = 0x35
[51230.647075] iwlagn 0000:03:00.0: xen map irq failed -22 for 32752 domain
[51230.647081] iwlagn 0000:03:00.0: pci_enable_msi failed
[51230.647113] iwlagn 0000:03:00.0: PCI INT A disabled
[51230.647126] iwlagn: probe of 0000:03:00.0 failed with error -22

with this on the Xen console

(XEN) physdev.c:139: dom0: can't create irq for msi!


I'm running Xen as of a422e2a4451e, which your MSI changes in them,
which I suspect of having caused a regression (since I don't remember
having problems reloading msi-using drivers before).

Thanks,
    J

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