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path: root/drivers/pci/setup-res.c
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Diffstat (limited to 'drivers/pci/setup-res.c')
-rw-r--r--drivers/pci/setup-res.c11
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