A fixed BAR always has an address, but its parent bridge window can be not yet calculated (during boot) or temporarily released for re-calculation (during PCI rescan) when pci_claim_resource() is called. Apart from that, fixed BARs now have separate guaranteed mechanism of assigning comparing to usual BARs, so claiming them is not needed. Return immediately from pci_claim_resource() to prevent a misleading "can't claim BAR ... no compatible bridge window" error message. Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@xxxxxxxxx> --- drivers/pci/setup-res.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 6ffda8b94c52..28ec3d8c79c8 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -139,6 +139,9 @@ int pci_claim_resource(struct pci_dev *dev, int resource) return -EINVAL; } + if (pci_dev_bar_fixed(dev, res)) + return 0; + /* * If we have a shadow copy in RAM, the PCI device doesn't respond * to the shadow range, so we don't need to claim it, and upstream -- 2.24.1
