Re: AMD 8131 MSI quirk called too late, bus_flags not inherited ?

[Rajesh Shah <rajesh.shah@intel.com>]

On Wed, May 24, 2006 at 07:59:58PM +0300, Michael S. Tsirkin wrote:
> 
> Offtopic, something I wanted to bring up with respect to MSI,
> but never had the time to debug:
> 
> If I do
> 
> pci_enable_msix, pci_disable_msix
> 
> then later
> 
> pci_enable_msi
> 
> on the same device fails with the following message:
> PCI: 0000:08:00.0: Can't enable MSI.  Device already has MSI-X vectors assigned
> 
> This is not something new - has been happening since forever.
> Looks like not all MSI-X vectors get properly unassigned by pci_disable_msix.
> 
Yes, this has been reported by others too. I've been looking at
MSI code recently to fix an unrelated problem, and noticed that
the code has policies about vector reservation that prevent
what you're trying to do. I'm planning to clean up the MSI
code shortly (patches out hopefully by next week), and will
remove such policies since many people are trying to do this.

thanks,
Rajesh