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VMware up to at least ESXi 5.1. Actually, using INTx in that case instead may still result in interrupt storms, with MSI being the only working option in some configurations. So introduce a PCI_QUIRK_DISABLE_MSIX quirk which only blacklists MSI-X but not also MSI and use it for the VMware PCI-PCI-bridges. Note that, currently, we still assume that if MSI doesn't work, MSI-X won't work either - but that's part of the internal logic and not guaranteed as part of the API contract. While at it, add and employ a pci_has_quirk() helper. Reported and tested by: Paul Bucher - Use NULL instead of 0 for pointers. Submitted by: jhb (mostly) Approved by: jhb MFC after: 3 days
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