> Gesendet: Dienstag, 03. November 2020 um 11:16 Uhr > Von: "Thomas Gleixner" <tglx@xxxxxxxxxxxxx> > Any architecture which selects PCI_MSI_ARCH_FALLBACKS and does not have > irqdomain support runs into: > > if (!d) > bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; > > which in turn makes pci_msi_supported() return 0 and consequently makes > pci_enable_msi[x]() fail. i'm not that deep into this, but just my thoughts...you are the experts :) checking for PCI_MSI_ARCH_FALLBACKS here does not help? something like this: #ifndef PCI_MSI_ARCH_FALLBACKS if (!d) bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; #endif imho pci_enable_msi[x]() does not do anything if there is no msi-support (or does not get called), so maybe check the PCI_BUS_FLAGS_NO_MSI before the call (if this is inside core) or inside the enable-function (if called from outside).... or is this the issue marc talkes about (called before flag is set)? regards Frank
