[PATCH RFC v4 07/21] PCI: Wake up bridges during rescan when movable BARs enabled

[Sergey Miroshnichenko]

Use the PM runtime methods to wake up the bridges before accessing
their config space.

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

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 88350dd56344..dc935f82a595 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3252,6 +3252,8 @@ static void pci_bus_rescan_prepare(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 
+	pm_runtime_get_sync(&bus->dev);
+
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *child = dev->subordinate;
 
@@ -3278,6 +3280,8 @@ static void pci_bus_rescan_done(struct pci_bus *bus)
 			dev->driver->rescan_done(dev);
 		}
 	}
+
+	pm_runtime_put(&bus->dev);
 }
 
 /**
-- 
2.20.1