PCI: Check IORESOURCE_UNSET before updating BAR
Check to make sure we don't update a BAR with an address we haven't
assigned.
If we haven't assigned an address to a resource, we shouldn't write it to a
BAR. This isn't a problem for the usual path via pci_assign_resource(),
which clears IORESOURCE_UNSET before calling pci_update_resource(), but
paths like pci_restore_bars() can call this for resources we haven't
assigned.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 725d5b2..7f76521 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -44,6 +44,9 @@
if (!res->flags)
return;
+ if (res->flags & IORESOURCE_UNSET)
+ return;
+
/*
* Ignore non-moveable resources. This might be legacy resources for
* which no functional BAR register exists or another important