[PATCH v6 05/30] PCI: hotplug: movable BARs: Fix reassigning the released bridge windows

[Sergey Miroshnichenko]

When a bridge window is temporarily released during the rescan, its old
size is not relevant anymore - it will be recreated from pbus_size_*(), so
it's start value should be zero.

If such window can't be reassigned, don't apply reset_resource(), so the
next retry may succeed.

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko at yadro.com>
---
 drivers/pci/setup-bus.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 2c02eb1acf5d..f2f02e6c9000 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -295,7 +295,8 @@ static void assign_requested_resources_sorted(struct list_head *head,
 						    0 /* don't care */,
 						    0 /* don't care */);
 			}
-			reset_resource(res);
+			if (!pci_can_move_bars)
+				reset_resource(res);
 		}
 	}
 }
@@ -1579,8 +1580,8 @@ static void pci_bridge_release_resources(struct pci_bus *bus,
 		type = old_flags = r->flags & PCI_RES_TYPE_MASK;
 		pci_info(dev, "resource %d %pR released\n",
 			 PCI_BRIDGE_RESOURCES + idx, r);
-		/* Keep the old size */
-		r->end = resource_size(r) - 1;
+		/* Don't keep the old size if the bridge will be recalculated */
+		r->end = pci_can_move_bars ? 0 : (resource_size(r) - 1);
 		r->start = 0;
 		r->flags = 0;
 
-- 
2.23.0