diff options
| -rw-r--r-- | drivers/pci/setup-res.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 439ac5f5907a..b492e67c3d87 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -214,6 +214,17 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev, root = pci_find_parent_resource(dev, res); if (!root) { + /* + * If dev is behind a bridge, accesses will only reach it + * if res is inside the relevant bridge window. + */ + if (pci_upstream_bridge(dev)) + return -ENXIO; + + /* + * On the root bus, assume the host bridge will forward + * everything. + */ if (res->flags & IORESOURCE_IO) root = &ioport_resource; else |